CVE-2026-22803 json
SvelteKit has a memory amplification DoS in Remote Functions binary form deserializer
published 9mo ago modified 4mo ago also EUVD-2026-2789 , GHSA-j2f3-wq62-6q46
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 48%
- public exploits
- 0
- none known
Summary
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. From 2.49.0 to 2.49.4, the experimental form remote function uses a binary data format containing a representation of submitted form data. A specially-crafted payload can cause the server to allocate a large amount of memory, causing DoS via memory exhaustion. This vulnerability is fixed in 2.49.5.
Patch / fix
- npm @sveltejs/kit 2.49.5
- svelte kit 2.49.5
- svelte sveltekit 2.49.5
Is CVE-2026-22803 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
- 9mo ago
Exploit prediction
0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-09).
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 | >=2.49.0, <2.49.5 |
2.49.5 |
Affected products
- sveltejs kit
Classification
References
-
github.com
/sveltejs/kit/commit/8ed8155215b9a74012fecffb942ad9a793b274e5
web, patch
-
github.com
/sveltejs/kit/security/advisories/GHSA-j2f3-wq62-6q46
web, vendor-advisory
-
github.com
/sveltejs/kit/releases/tag/@sveltejs%2Fadapter-node@5.5.1
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-22803
advisory
-
github.com
/sveltejs/kit
package
-
github.com
/sveltejs/kit/releases/tag/%40sveltejs%2Fkit%402.49.5
web
Sources
- CVE List CVE-2026-22803
- GitHub Advisory GHSA-j2f3-wq62-6q46
- NVD CVE-2026-22803
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.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.