CVE-2026-45741
HighCVSS 7.5Summary
Gotenberg in version 8.32.0 and earlier has a vulnerability in the IsPublicIP function that does not reject IPv6 prefixes such as 2002::/16, 64:ff9b::/96, fec0::/10, and others that can embed or route to non-public IPv4 destinations. A crafted DNS AAAA record can cause the outbound HTTP client to treat an address wrapping an internal destination (e.g., 169.254.169.254) as public, allowing access to cloud metadata services. This issue is fixed in version 8.33.0.
Risk Assessment
The attack can enable access to cloud metadata services and potentially expose cloud credentials, posing a serious threat to infrastructure security.
Recommendation
Update Gotenberg to version 8.33.0 or later.
Original NVD description (English source)
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.