CVE-2026-126799 json
Gotenberg 8.31.0 before 8.38.0 SSRF via IPv6 Zone Identifiers in IsPublicIP
published yesterday modified 13h ago also EUVD-2026-124014 , GHSA-fqg9-x2xw-5crx
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository gotenberg/gotenberg. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- —
- no EPSS score yet
- public exploits
- 0
- none known
Summary
Gotenberg 8.31.0 before 8.38.0 contains a server-side request forgery vulnerability in IsPublicIP() that allows unauthenticated attackers to bypass private-IP deny-list protections using IPv6 zone identifiers. Attackers can append a zone such as %25eth0 to the unspecified address or blocked IPv6 prefixes in downloadFrom, webhook, or Chromium/LibreOffice URLs to reach internal services and read responses in the returned PDF.
Patch / fix
- gotenberg gotenberg 8.38.0
Is CVE-2026-126799 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N |
| CNA | 4.0 | 6.9 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:L/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:H/PR:N/UI:N/S:C/C:H/I:L/A:N |
Affected products
- gotenberg gotenberg
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
-
github.com
/gotenberg/gotenberg/commit/8e850b1c932452627fba397f2005dd6fd57b9617
patch
-
github.com
/gotenberg/gotenberg/security/advisories/GHSA-fqg9-x2xw-5crx
vendor-advisory, advisory
-
github.com
/gotenberg/gotenberg/releases/tag/v8.38.0
release-notes
-
github.com
/gotenberg/gotenberg/blob/v8.37.0/pkg/gotenberg/outbound.go#L112-L142
technical-description
-
vulncheck.com
/advisories/gotenberg-8.31.0-before-8.38.0-ssrf-via-ipv6-zone-identifiers-in-ispublicip
third-party-advisory
Sources
- CVE List CVE-2026-126799
- NVD CVE-2026-126799
- Maintainer advisory GHSA-fqg9-x2xw-5crx
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 gotenberg/gotenberg published their own advisory on GitHub. Reviewed sources take precedence over it.