Update dependency swiper to v12 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
swiper (source)	^10.2.0 → ^12.1.2

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Prototype pollution in swiper

CVE-2026-27212 / GHSA-hmx5-qpq5-p643

More information

Details

Summary

A prototype pollution vulnerability exists in the the npm package swiper (>=6.5.1, < 12.1.2). Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using Array.prototype. The exploit works across Windows and Linux and on Node and Bun runtimes. This issue is fixed in version 12.1.2

Details

The vulnerability resides in line 94 of shared/utils.mjs where indexOf() function is used to check whether user provided input contain forbidden strings.

PoC

Steps to reproduce

1. Install latest version of swiper using npm install
2. Run the following code snippet:

var swiper = require('swiper');
Array.prototype.indexOf = () => -1;        
let obj = {};
var malicious_payload = '{"__proto__":{"polluted":"yes"}}';
console.log({}.polluted);
swiper.default.extendDefaults(JSON.parse(malicious_payload));
console.log({}.polluted);  // prints yes -> indicating that the patch was bypassed and prototype pollution occurred

Expected behavior

Prototype pollution should be prevented and {} should not gain new properties.
This should be printed on the console:

undefined
undefined OR throw an Error

Actual behavior

Object.prototype is polluted
This is printed on the console:

undefined 
yes

Impact

This is a prototype pollution vulnerability, which can have severe security implications depending on how swiper is used by downstream applications. Any application that processes attacker-controlled input using this package may be affected.
It could potentially lead to the following problems:

1. Authentication bypass
2. Denial of service - Even if an attacker is not able to exploit prototype pollution in swiper, if there is a prototype pollution within the project from other dependencies, modifying global Array.prototype.indexOf property can result in crash when swiper.default.extendDefaults is called because swiper makes use of this global property. This can lead to Denial of Service.
3. Remote code execution (if polluted property is passed to sinks like eval or child_process)

Related CVEs

CVE-2026-25521
CVE-2026-25047
CVE-2026-26021

Severity

• CVSS Score: 9.4 / 10 (Critical)
• Vector String: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

• https://github.com/nolimits4web/swiper/security/advisories/GHSA-hmx5-qpq5-p643
• https://github.com/nolimits4web/swiper/commit/d3e663322a13043ca63aaba235d8cf3900e0c8cf
• https://github.com/nolimits4web/swiper/releases/tag/v12.1.2
• https://nvd.nist.gov/vuln/detail/CVE-2026-27212
• https://github.com/advisories/GHSA-hmx5-qpq5-p643

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

---

Release Notes

nolimits4web/Swiper (swiper)

v12.1.2

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v12.1.1

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Bug Fixes

• a11y: fix focus in virtual mode enabled (3055008), closes #​8147
• core: avoid double-subtracting offsets in centerInsufficientSlides (#​8158) (60b0052)
• core: prevent duplicate module initialization in constructor (#​8155) (#​8156) (07738a2)
• types: support boolean as a11y value (#​8157) (6bf76d5)

v12.1.0

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Bug Fixes

• autoplay: broken custom delay percentages with pause/resume (#​8133) (0afecde)
• core: Don't use data-swiper-slide-index for realIndex when virtual module is enabled (#​8142) (bd957f8)
• core: Escape all CSS selector special characters (d35f41a), closes #​8135
• core: support slidesOffsetBefore and slidesOffsetAfert in cssMode (45b98d0), closes #​7926
• fix lazy preloader removal error in react in vue (332f5c7), closes #​8149
• thumbs: update slide classes on virtual swiper update (#​8141) (9752771)
• types: Add autoScroll to thumbs.update type signature (#​8146) (5d91e6e)
• zoom: initialize gesture state after programmatic zoom (#​8112) (71e9511)

Features

• keyboard: add support for custom speed parameter in keyboard navigation (#​8148) (7a4a0e5)
• new snapToSlideEdge parameter (de3131f), closes #​8021 #​4780

v12.0.3

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Bug Fixes

• element: fixed reference to nav arrows SVG (0b17ecf), closes #​8115

Features

• core: add 'getRotateFix' export to effect utils (c97ae5d), closes #​8114

v12.0.2

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Features

• navigation: add styles for when buttons set before slider (4588c57), closes #​8085
• navigation: new addIcons parameter to add SVG icons to nav buttons (b955b0c), closes #​8088 #​8087

v12.0.1

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Bug Fixes

• navigation: tweak nav styles when adjacent (98440d9)

v12.0.0

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Bug Fixes

• core: fixes issues when slidesOffsetBefore & slidesOffsetAfter are combinated with centeredSlides, slidesPerView & loop (#​8038) (74cc297), closes #​7298 #​7956 #​6916
• effect-cards: fix offset in vertical direction when rotate is unset (a248ca1), closes #​8075
• get-device: regexp tweak (60bb79b), closes #​8057
• types: correct types for getSlideTransformEl (b34bdce), closes #​8054

Features

• a11y: add wrapperLiveRegion param to disable wrapper live region in a11y module (#​8061) (d03044e)
• move to SVG icons for navigation (264603c), closes #​6652 #​4990
• remove LESS and SCSS styles in favor of CSS (118ec66)
• virtual: add slidesPerViewAutoSlideSize parameter for fixed slide dimensions with slidesPerView auto (d472144), closes #​8041 #​7796

v11.2.10

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Bug Fixes

• core: fix clickedIndex with grid (863d8bd)

v11.2.9

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Bug Fixes

• core: clear blank slides within loopCreate() (#​8033) (377d53c)
• core: escape brackets when transforming classes to selector (#​8014) (0c53ee8)
• core: slideTo function does not work when grid.rows > 1 (#​8030) (1fde9d3)
• core: using loop and slideToClickedSlide / slideToLoop with centeredSlides (b6692e2), closes #​8031
• element: don't set subprops on boolean values (090caa1), closes #​8003
• keyboard: detect contenteditable element in keyboard module (#​8006) (fcd434a)
• vue: add missing event (839cafb), closes #​8002

v11.2.8

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Bug Fixes

• virtual: fix error in Virtual slides (7a53208), closes #​7997

v11.2.7

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Bug Fixes

• core: fix for slideResetTransition events (#​7989) (473ec25)
• core: set innerHTML using trusted type (8a46954), closes #​7961
• react,vue: fix not rendered slides in effects when Virtual is enabled (e4e1680), closes #​7730
• types: add enabled property on swiper-class.d.ts (#​7973) (ccd96dc)
• types: coverflow effect can be number or string with percentage (#​7931) (4d988d8)
• types: fix effect param type (#​7945) (42eec07)
• vue: added missing props (#​7966) (6aa8d05)

v11.2.6

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Bug Fixes

• cards/loop: improve loop behavior with cards effect (9a258d4), closes #​7917
• core: fix initialSlide in loop mode when it there are not enough slides to fill (16818e2), closes #​7780
• core: fix touchReleaseOnEdges in RTL (d841428), closes #​7179

v11.2.5

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Bug Fixes

• docs: correct structure of pagination render functions (b259723), closes #​7897 #​7896
• thumbs: correct reinit thumbs (1cf24d4), closes #​7880
• zoom: fix transform origin of zoom.in() function (#​7904) (f7febe1)

Features

• check if slidesEl is defined in loopDestroy (#​7906) (ced30cb)

v11.2.4

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Bug Fixes

• restore compatibility with ES2019 #​7891 (#​7892) (b4fbbb3)

v11.2.3

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Bug Fixes

• element: remove infinite preloader in loop (#​7886) (c0d3ece)

Features

• core: export swiper-vars.scss for overwriteability (#​7883) (0b688a1), closes #​7882
• update ssr-window to latest (c521888)

v11.2.2

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Bug Fixes

• cards: fix slides swap issue in loop mode (e012e34), closes #​7823
• core: fix slidePrev issue in free-mode (a3fee36), closes #​7869
• virtual: fix when Element not swiping in Safari (5abdbfd), closes #​7679

v11.2.1

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Bug Fixes

• core: fix clickedIndex with grid (863d8bd)

v11.2.0

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Bug Fixes

• core: Fixed elementIsChildOf returning false for nested web components (#​7762) (8136607), closes #​7761
• zoom: Ensure the zoom module's array is cleared onTouchEnd to fix #​7304 (#​7830) (21610bd)

Features

• core: Allow using a CSS selector as breakpointsBase (#​7818) (44d3443)
• zoom: Add ability to pan around an image on mouse move (#​7831) (c4619bb), closes #​7306

v11.1.15

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Bug Fixes

• react: react strict mode double initialization errors for thumbs (#​7789) (9dece7d)
• scss: Dart Sass 3.0.0 compatibility (fbd2ba4), closes #​7772 #​7771
• types: remove 'Lazy' declaration (#​7739) (40a705e)
• types: type definitions for slidesEl, slidesGrid, and slidesSizesGrid (#​7768) (fb59a41)

v11.1.14

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Bug Fixes

• core: fix mobile input blur on touchstart on different input (66c5dd1), closes #​7728
• element: Query the swiper.hostEl for the navigation buttons (#​7714) (#​7716) (d0b6abd)
• zoom: add sanity check before allowTouchMove call in timeout (#​7723) (869bb84)

v11.1.12

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Bug Fixes

• cards: fix cards effect styles leak (0be4c6a), closes #​7712

Features

• a11y: add containerRole parameter (#​7708) (1542c01)

v11.1.11

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Bug Fixes

• centeredSlides with centeredSlidesBounds don't work correct when slidesPerView: 'auto' and width of the swiper-container bigger then width of slides (#​7696) (c11172a)
• element: fix element styles to have correct order override (f26036f), closes #​7704
• virtual: fix bypassing initial translate check if Virtual is enabled (df957bb), closes #​7699

v11.1.10

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Bug Fixes

• pagination: fixed swiper Infinite loop scroll jumping (#​7690)
• zoom: fix zoomIn after currentScale is set to 1 (#​7663) (94173da)

v11.1.9

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Bug Fixes

• core: fix loop missing slides with centeredSlides (4847fcb), closes #​7584
• core: fix types of swiper-effect-utils.d.ts (#​7655) (4875f26)
• mousewheel: fix issue with event handling after Swiper was destroyed (82ae434), closes #​7654

Features

• add types for minTranslate and maxTranslate functions (#​7647) (450c57a)

v11.1.8

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Bug Fixes

• core: fixed typo in utils/elementIsChildOf (#​7649) (575e715)

v11.1.7

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Bug Fixes

• core: fix element child detection (7ec975c), closes #​7636

v11.1.6

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Bug Fixes

• controller: fix 2 way control in element (6eec16b), closes #​7628

Features

• a11y: added new prop for a11y module - scrollOnFocus (#​7632) (f4f7da0)
• element: added support for using slots as swiper wrappers (#​7624) (e374e06)

v11.1.5

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Bug Fixes

• element: fix observer to watch for slides (7cffede), closes #​7598
• improved 3d rotate fix in Safari (cb83879), closes #​7532
• update navigation.scss to remove SASS Deprecation Warning (#​7612) (a3e0bf8)
• vue: add breakpointsBase type (4adb85b), closes #​7607

v11.1.4

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Bug Fixes

• a11y: fix slide on focus when loop mode is enabled (fc8ed1a), closes #​7540
• core: check for swiper.el in destroy queue (39a3e53), closes #​7530
• navigation: prevent hide on click when clicking on navigation buttons (c0f7bb6), closes #​7559
• vue: avoid rendering same slide vnode twice for small amount of slides in loop + virtual mode (#​7556) (5737f03)
• zoom: fix issue when slide change possible during zoom out (f67308c)

v11.1.3

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Bug Fixes

• fix types import (57923db), closes #​7529

v11.1.2

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Bug Fixes

• autoplay: keep 0 transition on touchmove with 0 timeout delay (8ccb08e), closes #​7515
• core: centerInsuffientSlides takes offsets into account (#​7437) (5a271ff)
• types: fixed SwiperModule, slideTo, effectInit types (#​7428) (bc61bce)

Performance Improvements

• do not remove and re-add visibility classes for unchanged slides to prevents unnecessary style recalculations (This performance difference is mostly noticable when moving a slide with a mouse or touchmove because updateSlidesProgress is triggered for every keyboard-/touchevent) (#​7505) (2c08227)

v11.1.1

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Bug Fixes

• react: react strict mode double initialization errors for thumbs (#​7789) (9dece7d)
• scss: Dart Sass 3.0.0 compatibility (fbd2ba4), closes #​7772 #​7771
• types: remove 'Lazy' declaration (#​7739) (40a705e)
• types: type definitions for slidesEl, slidesGrid, and slidesSizesGrid (#​7768) (fb59a41)

v11.1.0

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Bug Fixes

• a11y: fixed issue with not working "enter" navigation on arrows (aac2dcf), closes #​7423
• a11y: prevent falsy focus handlers (a7c260a), closes #​7406
• core: add/remove slide classes only when changed (3312fba), closes #​7356
• core: don't fix the loop on simple resize (641793f), closes #​7325
• core: fixed thrown error on calling slideTo methods on destroyed swiper (8c6a3c6), closes #​7416
• core: handle grabCursor within breakpoints (e853908), closes #​7364
• core: reset animating flag on translateTo call (7da50bf), closes #​7403
• scrollbar: fix warning (e5371f7), closes #​7415
• thumbs: fix thumbs .swiper type prop to accept string (5b0fa84), closes #​7421
• virtual: don't render first slides when initialSlide set (bab9230), closes #​7353
• zoom: fix panning on SVG elements (eed8a5b), closes #​7352

v11.0.7

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Bug Fixes

• core: fix initial slide index shift with centeredSlides and slidesPerView auto (#​7319) (cae9c2d)
• history: fix setting history in virtual slides (d4de17b), closes #​7327
• react: make sure the key is unique in virtual mode (829a253), closes #​7329

Features

• add swiper-effect-utils (df5f873), closes #​7336
• zoom: add ability to constrain max zoom to 100% of original image size (#​7311) (645f266)

v11.0.6

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Bug Fixes

• add optional swiperElementNodeName param to allow more flexible web component usage (#​7284) (178511f)
• fixed behavior where the combination of 'initialSlide:0' and 'slidesPerView:auto' would shift the first slide position (e5c04c3), closes #​7216
• Safari 3D fix for webview (d42ce05), closes #​7167
• scrollbar: correctly update scrollbar on changeDirection (6bbb73d), closes #​7263
• SwiperOptions documentation for loopAddBlankSlides (#​7289) (cbc3dba)

Features

• core: prevent running .slideTo methods when Swiper is destroyed (05f9c64), closes #​7265

v11.0.5

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Bug Fixes

• core: swipe to last with slidesPerView: auto (#​7183) (2e3f47d)
• modules/a11y: filter out falsy pagination elems (#​7201) (a044626)

Features

• core: new slidesUpdated event (8a0c7c4)

v11.0.4

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Bug Fixes

• effectx: fix Safari issue with rotates even to 90deg (e005b69), closes #​7167

v11.0.3

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Bug Fixes

• core: fixed legacy condition preventing touch move when zoom enabled (2f64043), closes #​7137
• core: prevent observer updates on loop fix (7a5eacc), closes #​7135

v11.0.2

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Bug Fixes

• core: correctly handle loopAdditionalSlides parameter (3f5e05d)

v11.0.1

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Bug Fixes

• types: fix eventsPrefix type (fd0f601)

v11.0.0

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Bug Fixes

• autoplay: fix negative autoplay values after stop/start, fix autoplay with free mode (8bef84d), closes #​7084
• autoplay: fix pauseOnPointerEnter if hovered during transition (5080d95), closes #​7107
• core: remove grid class on rows change (2f65e89), closes #​7053
• element: correctly respond to object params assignment (f23c742)
• scrollbar: allow multiple classes in scrollbar parameters (89a6f71), closes #​7096

Features

• core: add fully visible slides classes (902a4c4), closes #​6773
• core: add handling for native touch events (74bb1cc), closes #​6478 #​6381 #​6897
• core: loop support for grid, new loopAddBlankSlides parameter (b5db223)
• core: remove loopedSlides parameter, add loopAdditionalSlides parameter (d647985)
• core: reworked loop mode (2a99dbd)
• core: update loop mode logic and lowered requirements (703ede6)
• element: makeeventPrefix parameter default to swiper (88d463a)
• core: move default container overflow back to hidden (88941a8)

v10.3.1

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Bug Fixes

• autoplay: fix autoplay stop when disableOnInteraction is active (ecfb3fb), closes #​7060 #​7059
• types: detection of custom html tags (#​7055) (c55f76d)

v10.3.0

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Bug Fixes

• core: correctly destroyor create loop on breakpoints (12a44fb), closes #​6967
• core: don't call realIndexChange on initialIndex if runCallbacksOnInit is disalbed (48c4e0a), closes #​6976
• core: fix slideToClickedSlide when using Element slide slots (af0519c), closes #​6958
• core: fix lazy preloader in later initialized slides (e4fddc0), closes #​6946
• core: fix loop on centeredSlides slide to beginning (c496835), closes #​7011
• core: fix loopFix in loop and cssMode (8180a52), closes #​6919
• core: fixed ignored allowSlidePrev/Next in loop mode (1b74619), closes #​6987
• core: remove grid class on rows change (908becc), closes #​7053
• element: correctly respond to object params assignment (2ef1ff5)
• element: do not bubble hashchange event (106a3d7), closes #​6943
• element: fix issue updating with boolean module params (1cc359e), closes #​6947
• navigation: fix lock class on enable (ea39c33), closes #​7009
• react: add breakpointsBase param (0eb4122), closes #​7014
• react: fix react components props type (1cd412e), closes #​7000
• scrollbar: add 'touch-action: none' to swiper-scrollbar (#​7024) (9542d09)
• virtual: fix issue with loop mode and initialSlide enabled (f4afd9d), closes #​6945
• virtual: fix removing nested slides (c3321e1), closes #​7005
• virtual: recalc cache on removeSlide (96e5166), closes #​7020
• vue: add breakpointsBase param (6800dbb)
• zoom: fix scale origin when document is scrolled (2cf3fc2), closes #​6950 #​6955

Features

• core: allow createElements to process object params with {enabled: true} (abf8405)
• core: make slidesPerViewDynamic public (ae434b0), closes #​7036

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