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Vulnerabilities

Vulnerability · CVE-2026-22803

SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte.

Published Jan 15, 2026 · catalog updated Jan 15, 2026 · SvelteKit is a framework

Last checked Oct 30, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-22803. EPSS is 0.59%. Act only if a listed version of SvelteKit is a framework is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (SvelteKit is a framework).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.59%
Remediation
Version ranges on file
Affected products
vendor sveltejs kit 2.49.0, < 2.49.5

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor sveltejs kit 2.49.0, < 2.49.52.49.0, < 2.49.5

How to fix CVE-2026-22803

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-22803. EPSS is 0.59%. Act only if a listed version of SvelteKit is a framework is installed.

Which versions are affected?

Compare what you have installed with sveltejs kit 2.49.0, < 2.49.5 2.49.0, < 2.49.5. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.59%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 15, 2026 · EUVD

    Detected

    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.

  2. Jan 15, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-22803

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-22803

    30-day exploitation probability 0.59%

    first.org
  • EUVDVulnerability recordEUVD-2026-2789

    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 s

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 30, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 30, 2026
  • FIRST EPSSOct 30, 2026
  • EUVDOct 30, 2026