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CVE-2026-128121VulnerabilityPublished

@sveltejs/adapter-vercel · SvelteKit: Prerendered paths are interpreted as regular expressions in Vercel route config generated by

Affects @sveltejs/adapter-vercelSource GCVE Database

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Authoritative record:CVE-2026-128121· Medium 5.9

Not known to be exploited · CVSS 5.9 Medium : upgrade to 6.3.5 when convenient.

Data as of 13 Nov 2026, 21:20 UTC

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.15.9
Patch
Available – fixed in 6.3.5, 4.0.1, 7.0.2 +1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
npm@sveltejs/adapter-vercelAffected
  • <6.3.5
Fixed in
  • 6.3.5
npm@sveltejs/adapter-staticAffected
  • >=4.0.0-next.0 <4.0.1
Fixed in
  • 4.0.1
npm@sveltejs/adapter-vercelAffected
  • >=7.0.0-next.0 <7.0.2
Fixed in
  • 7.0.2
npm@sveltejs/adapter-staticAffected
  • <3.0.11
Fixed in
  • 3.0.11

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied by upgrading to one of the fixed versions: 6.3.5, 4.0.1, 7.0.2, or 3.0.11. Users should update their @sveltejs/adapter-vercel dependency to a fixed version to remediate this vulnerability.

Description

A vulnerability in @sveltejs/adapter-vercel allows prerendered paths to be interpreted as regular expressions in the Vercel routing configuration. This occurs if an attacker can influence a link crawled during the prerender phase, potentially causing unintended regex interpretation. The issue affects multiple versions prior to fixed releases and has a medium severity with a CVSS score of 5.9.

References

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