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Vulnerabilities

Vulnerability · CVE-2026-40280

Gotenberg is an API-based document conversion tool.

Published May 5, 2026 · catalog updated Jul 24, 2026 · Gotenberg is an API-based

Check if you run it

No confirmed exploitation is on record for CVE-2026-40280. EPSS is 2.11%. Act only if a listed version of Gotenberg is an API-based is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Gotenberg is an API-based).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.11%
Remediation
Version ranges on file
Affected products
cpe thecodingmachine/gotenberg · stated gotenberg

Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the deny-list by simply capitalizing part of the URL scheme (e.g., HTTP://, HTTPS://, or Http://). This allows unauthenticated requests to reach internal network services, including private IP ranges, loopback addresses, and cloud instance metadata endpoints such as HTTP://169.254.169.254/latest/meta-data/. This bypasses the same security control that was patched in CVE-2026-27018. This issue has been fixed in version 8.31.0.

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.

  • cpe thecodingmachine/gotenbergversion unspecified
  • stated gotenberg<= 8.30.1

How to fix CVE-2026-40280

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-2026-40280. EPSS is 2.11%. Act only if a listed version of Gotenberg is an API-based is installed.

Which versions are affected?

Compare what you have installed with <= 8.30.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-918: Server-Side Request Forgery (SSRF). EPSS 2.11%. 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. May 5, 2026 · NIST NVD

    Detected

    Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the

  2. Jul 24, 2026 · NIST NVD

    Updated

    Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/url.Parse() normalizes the scheme to lowercase before establishing the outbound TCP connection, an attacker can bypass the

Sources

  • CVE.orgVulnerability recordCVE-2026-40280

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40280

    30-day exploitation probability 2.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40280

    Gotenberg is an API-based document conversion tool. In versions 8.30.1 and earlier, the default private-IP deny-lists for the --webhook-deny-list and --api-download-from-deny-list flags use a case-sensitive regular expression (^https?://) to match URL schemes. Because Go's net/ur

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.