CVE-2026-40073 json
SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter-node
published 2026-04-10 6 mo ago modified 2026-10-25 14 d ago also EUVD-2026-21502 , GHSA-2crg-3p73-43xp
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. Prior to 2.57.1, under certain circumstances, requests could bypass the BODY_SIZE_LIMIT on SvelteKit applications running with adapter-node. This bypass does not affect body size limits at other layers of the application stack, so limits enforced in the WAF, gateway, or at the platform level are unaffected. This vulnerability is fixed in 2.57.1.
Patch / fix
- npm @sveltejs/kit 2.57.1
- svelte kit 2.57.1
- svelte sveltekit 2.57.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 6 mo ago
Exploit prediction
0.55% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.2 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 4.0 | 8.2 | CVSS:4.0/AV:N/AC:L/AT:P/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 |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @sveltejs/kit | <2.57.1 |
2.57.1 |
Affected products
- sveltejs kit
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
github.com
/sveltejs/kit/commit/3202ed6c98f9e8d86bf0c4c7ad0f2e273e5e3b95
web, patch
-
github.com
/sveltejs/kit/security/advisories/GHSA-2crg-3p73-43xp
web, vendor-advisory
-
github.com
/sveltejs/kit/releases/tag/@sveltejs/kit@2.57.1
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-40073
advisory
-
github.com
/sveltejs/kit
package
-
github.com
/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.57.1
web
Sources
- CVE List CVE-2026-40073
- GitHub Advisory GHSA-2crg-3p73-43xp
- NVD CVE-2026-40073
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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.