TI-2026-33478 Aliases CVE-2026-45741 GHSA-86m8-88fq-xfxp

Gotenberg: SSRF deny-list bypass in IsPublicIP via IPv6 6to4 / NAT64 / site-local prefixes

HIGH 66CWE-184Published 2026-08-19 · Updated 2026-08-19

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Gotenberg is a Docker-powered stateless API for PDF files. In 8.32.0 and earlier, the IsPublicIP function in pkg/gotenberg/outbound.go does not reject the 2002::/16 6to4 prefix, the 64:ff9b::/96 and 64:ff9b:1::/48 NAT64 prefixes, the fec0::/10 deprecated site-local prefix, Teredo, and other transition prefixes that can embed or route to non-public IPv4 destinations. The addr.Unmap operation only handles IPv4-mapped IPv6 addresses, so a crafted DNS AAAA record can cause the outbound HTTP client to treat an address wrapping an internal destination such as 169.254.169.254 as public. An unauthenticated attacker can use a conversion route with WithDenyPrivateIPs enabled to reach cloud metadata services, and the Chromium URL conversion route can return the internal response as a PDF, potentially exposing cloud credentials. Exploitation requires a deployment whose host routes the relevant IPv6 prefix, such as a dual-stack or NAT64-enabled environment. This issue is fixed in version 8.33.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00372 31st percentileScored 2026-11-07

Fix Fixed gotenberg (gotenberg): 8.33.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
gotenberg	gotenberg	before 8.33.0	8.33.0	Patch available	CNA
—	github.com/gotenberg/gotenberg/v8 (Go)	up to 8.32.0	—	No fix listed	GHSA-86m8-88fq-xfxp

gotenberg Vendorgotenberg Affected before 8.33.0 Fixed in 8.33.0 Patch available CNA
github.com/gotenberg/gotenberg/v8 (Go) Vendor— Affected up to 8.32.0 Fixed in — No fix listed GHSA-86m8-88fq-xfxp

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:thecodingmachine:gotenberg::::::::	—	—	gotenberg

cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:* Versions — — ·gotenberg

Remediation

Fix · CNA gotenberg (gotenberg) Fixed in 8.33.0

Timeline

2026-10-02 Threatist record created from CVE-2026-45741
2026-10-03 Alias added: GHSA-86m8-88fq-xfxp

References

Other 4

TI-2026-30869 Gotenberg: Unauthenticated RCE via ExifTool Metadata Key Injection CVSS 3.1CRITICAL 9.8
TI-2026-29063 Gotenberg vulnerable to argument injection via newlines in ExifTool metadata values CVSS 3.1CRITICAL 10.0
TI-2026-30876 Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook CVSS 3.1CRITICAL 9.4
TI-2026-27588 Gotenberg has a ReDoS via extraHttpHeaders scope feature CVSS 4.0HIGH 8.7
TI-2026-30875 Gotenberg: Server-Side Request Forgery via Chromium URL Endpoint with Redirect-Based Deny-List Bypass CVSS 3.1HIGH 8.6
TI-2026-30871 Gotenberg: Server-Side Request Forgery (SSRF) in github.com/gotenberg/gotenberg/v8 CVSS 3.1HIGH 8.2

See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences