CVE-2026-82261 json
SvelteKit before 2.52.2 CPU Exhaustion via Remote Form Deserialization
published 8mo ago modified last mo. also EUVD-2026-67587 , GHSA-88qp-p4qg-rqm6
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 42%
- public exploits
- 0
- none known
Summary
SvelteKit (@sveltejs/kit) versions >=2.49.0 and <=2.52.1 with experimental remote functions and form enabled contain a CPU exhaustion vulnerability in form deserialization. An attacker can send malformed form data to cause the server to become unresponsive while processing the request, resulting in denial of service. Fixed in 2.52.2.
Patch / fix
- npm @sveltejs/kit 2.52.2
- sveltejs kit 2.52.1
Is CVE-2026-82261 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @sveltejs/kit | >=2.49.0, <2.52.2 |
2.52.2 |
Affected products
- sveltejs kit
Classification
References
-
github.com
/sveltejs/kit/commit/3e607b314aec9e5f278d32847945b8b6323e1cb8
web
-
github.com
/sveltejs/kit/security/advisories/GHSA-88qp-p4qg-rqm6
vendor-advisory, web, advisory
-
vulncheck.com
/advisories/sveltekit-before-2.52.2-cpu-exhaustion-via-remote-form-deserialization
third-party-advisory
-
github.com
/sveltejs/kit
package
-
github.com
/sveltejs/kit/releases/tag/@sveltejs/kit@2.52.2
web
Sources
- CVE List CVE-2026-82261
- GitHub Advisory GHSA-88qp-p4qg-rqm6
- NVD CVE-2026-82261
- Maintainer advisory GHSA-88qp-p4qg-rqm6
Fencer Intel 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.
The maintainers of sveltejs/kit published their own advisory on GitHub. Reviewed sources take precedence over it.