Swiper is a free and mobile touch slider with hardware accelerated transitions and native behavior. Versions 6.5.1 through 12.1.1 have a Prototype pollution vulnerability. The vulnerability resides in line 94 of shared/utils.mjs, where the indexOf() function is used to check whether user provided input contain forbidden strings. 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. Any application that processes attacker-controlled input using this package may be affected by the following: Authentication Bypass, Denial of Service and RCE. This issue is fixed in version 12.1.2.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-1321"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27212.json"
}{
"extracted_events": [
{
"cpe": "cpe:2.3:a:swiperjs:swiper:*:*:*:*:*:node.js:*:*",
"range": [
{
"introduced": "6.5.1"
},
{
"fixed": "12.1.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "d3e663322a13043ca63aaba235d8cf3900e0c8cf"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "v12.1.2",
"range": [
{
"fixed": "2fd88b718b6854e8d6be7f183e68b73b68dae816"
}
],
"source": "REFERENCES_TAG"
}
]
}