CVE-2026-42592

Description

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, FilterOutboundURL resolves the hostname, checks the resolved IPs against the private-address deny-list, and returns only the error. It discards the resolved addresses. Chromium later performs its own DNS resolution when it navigates to the URL. An attacker who controls DNS for a hostname with a short TTL returns a public IP on the first query (Gotenberg allows) and a private IP on the second query (Chromium connects to the attacker-chosen internal address). The CDP Fetch.requestPaused handler re-checks the URL but runs its own DNS resolution, leaving a timing window before Chromium's actual TCP connect. The rendered internal service response returns to the caller as a PDF. This vulnerability is fixed in 8.32.0.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0004

Probability of exploitation

0.11%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-367 CWE-367

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
thecodingmachine	gotenberg	< 8.32.0

References

Advisories & Patches

https://github.com/gotenberg/gotenberg/security/advisories/GHSA-2pmr-289p-44r3 https://github.com/gotenberg/gotenberg/security/advisories/GHSA-2pmr-289p-44r3

Exploits

https://github.com/gotenberg/gotenberg/security/advisories/GHSA-2pmr-289p-44r3 https://github.com/gotenberg/gotenberg/security/advisories/GHSA-2pmr-289p-44r3

Frequently Asked Questions

What is CVE-2026-42592? +

Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.32.0, FilterOutboundURL resolves the hostname, checks the resolved IPs against the private-address deny-list, and returns only the error. It discards the resolved addresses. Chromium later performs its own DNS resolution when it navigates to the URL. An attacker who controls DNS for a hostname with a short TTL returns a public IP on the first query (Gotenberg allows) and a private IP on the second query (Chromium connects to the attacker-chosen internal address). The CDP Fetch.requestPaused handler re-checks the URL but runs its own DNS resolution, leaving a timing window before Chromium's actual TCP connect. The rendered internal service response returns to the caller as a PDF. This vulnerability is fixed in 8.32.0. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-42592? +

CVE-2026-42592 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0004, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42592? +

CVE-2026-42592 affects products from thecodingmachine, specifically: gotenberg. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42592? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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