# CVE-2026-42592: Gotenberg DNS rebinding SSRF in Chromium URL conversion

Source: https://junglewise.ai/threats/cve-2026-42592-gotenberg-dns-rebinding-ssrf-in-chromium-url-conversion  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-14. Updated: 2026-05-18  
License: CC BY 4.0 with a link back

CVE-2026-42592 · Severity: medium · CVSS 5.3 · Published 2026-05-14

Gotenberg is a tool used to convert web pages and documents into PDF files. A security flaw allows attackers to bypass safety filters and force the system to access internal company servers or private cloud data that should be off-limits. By tricking the system into connecting to these private addresses, an attacker can capture sensitive internal information and receive it back in the form of a generated PDF.

Technologies: [github.com/gotenberg/gotenberg/v7 (Go)](https://junglewise.ai/threats/technologies/github-com-gotenberg-gotenberg-v7), [github.com/gotenberg/gotenberg/v8 (Go)](https://junglewise.ai/threats/technologies/github-com-gotenberg-gotenberg-v8), [Gotenberg](https://junglewise.ai/threats/technologies/gotenberg). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Gotenberg](https://junglewise.ai/threats/vendors/gotenberg).

## Quick answers

**Is CVE-2026-42592 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-42592 being exploited in the wild.

**How severe is CVE-2026-42592?** Medium severity, with a CVSS score of 5.3, published 14 May 2026.

**Which products and versions are affected?** github.com/gotenberg/gotenberg/v7 (Go) SEMVER:introduced=0; github.com/gotenberg/gotenberg/v8 (Go) <= 8.31.0, SEMVER:introduced=0, SEMVER:introduced=0,last_affected=8.31.0; Gotenberg < 8.32.0, <= 8.31.0.

**Is there a fix for CVE-2026-42592?** A patch was published on 2026-05-14: Fix released in version 8.32.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-42592 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-42592?** Check whether you run github.com/gotenberg/gotenberg/v7 (Go), github.com/gotenberg/gotenberg/v8 (Go) or Gotenberg at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Time-of-Check Time-of-Use (TOCTOU) vulnerability exists in Gotenberg's Chromium-based URL conversion. The 'FilterOutboundURL' function validates a hostname against a private-address deny-list but discards the resolved IP address. Chromium then performs its own independent DNS resolution when navigating. An attacker controlling a DNS server with a short TTL can provide a public IP during the initial validation and a private/internal IP (such as 127.0.0.1 or 169.254.169.254) during Chromium's actual connection phase. This DNS rebinding attack allows unauthenticated remote attackers to perform Server-Side Request Forgery (SSRF) and exfiltrate internal service responses via the rendered PDF output. The issue is fixed in version 8.32.0 by ensuring resolved IPs are pinned.

## Affected products

- Gotenberg Gotenberg < 8.32.0

## Identifiers

- CVE-2026-42592
- GHSA-2pmr-289p-44r3
- GO-2026-4990

## Timeline

- 2026-04-30: advisory: GitHub security advisory published by maintainers
- 2026-05-14: disclosed: CVE published to NVD
- 2026-05-14: patched: Fix released in version 8.32.0

## References

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

## Related threats

- [Gotenberg server-side request forgery in IsPublicIP IPv6 handling](https://junglewise.ai/threats/cve-2026-126799-gotenberg-8-31-0-before-8-38-0-contains-a-server-side-request)
- [Gotenberg race condition in multipart downloadFrom handling](https://junglewise.ai/threats/cve-2026-45742-gotenberg-race-condition-in-multipart-downloadfrom-handling)
- [Gotenberg SSRF deny-list bypass in IsPublicIP via IPv6 prefixes](https://junglewise.ai/threats/cve-2026-45741-gotenberg-ssrf-deny-list-bypass-in-ispublicip-via-ipv6-prefixes)
- [Gotenberg path traversal via Windows-style separators in ZIP entry names](https://junglewise.ai/threats/cve-2026-44829-gotenberg-path-traversal-via-windows-style-separators-in-zip)
- [Gotenberg SSRF and local file disclosure in LibreOffice conversion](https://junglewise.ai/threats/cve-2026-55229-gotenberg-ssrf-and-local-file-disclosure-in-libreoffice)