CVE-2026-82257 json
SvelteKit before 2.69.1 Prototype Pollution via File Input
published 2026-07-24 3 mo ago modified 2026-10-08 32 d ago also GHSA-866w-xmhq-wj7x , EUVD-2026-67583
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 29%
- public exploits
- 0
- none known
Summary
SvelteKit versions before 2.69.1 contain a prototype pollution vulnerability in remote form functions with file input fields that accept arbitrary user-controlled path names. Attackers can manipulate the deletion path to remove methods on the prototype, potentially disabling application functionality.
Patch / fix
- npm @sveltejs/kit 2.69.1
- sveltejs kit 2.69.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
| CNA | 4.0 | 5.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @sveltejs/kit | <2.69.1 |
2.69.1 |
Affected products
- sveltejs kit
Classification
- Weakness
-
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
References
-
github.com
/sveltejs/kit/pull/16218
web
-
github.com
/sveltejs/kit/commit/df32f6fe86cdd0b68b650e3e4631e5896453dcd3
web
-
github.com
/sveltejs/kit/security/advisories/GHSA-866w-xmhq-wj7x
vendor-advisory, web
-
vulncheck.com
/advisories/sveltekit-before-2.69.1-prototype-pollution-via-file-input
third-party-advisory
-
github.com
/sveltejs/kit
package
-
github.com
/sveltejs/kit/releases/tag/@sveltejs/kit@2.69.1
web
-
github.com
/sveltejs/kit/releases/tag/@sveltejs/kit@3.0.0-next.7
web
Sources
- CVE List CVE-2026-82257
- GitHub Advisory GHSA-866w-xmhq-wj7x
- NVD CVE-2026-82257
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.