CVE-2026-45741 gotenberg CVE debrief

Who should care

Defenders responsible for Gotenberg deployments, particularly those in dual-stack or NAT64-enabled environments, should assess exposure and prioritize upgrading to version 8.33.0. They should verify if the deployment uses a dual-stack or NAT64-enabled environment, check if the Gotenberg version is earlier than 8.33.0, and monitor for potential exploitation attempts.

Why it matters

CVE-2026-45741 is a vulnerability in Gotenberg that allows an unauthenticated attacker to reach cloud metadata services. Defenders should prioritize verifying exposure in dual-stack or NAT64-enabled environments and upgrading to version 8.33.0.

• Potential exposure of cloud credentials
• Possible unauthorized access to cloud metadata services
• Verification of deployment environment and Gotenberg version required
• Upgrade to version 8.33.0 or later necessary

Technical summary

The IsPublicIP function in pkg/gotenberg/outbound.go does not correctly handle certain IPv6 prefixes, allowing an unauthenticated attacker to reach cloud metadata services. The vulnerability can be exploited in dual-stack or NAT64-enabled environments, and defenders should assess exposure and prioritize upgrading to version 8.33.0. 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.

Defensive priority

Defenders should prioritize verifying exposure in dual-stack or NAT64-enabled environments and upgrading to version 8.33.0.

Recommended defensive actions

• Verify if the deployment uses a dual-stack or NAT64-enabled environment
• Check if the Gotenberg version is earlier than 8.33.0
• Upgrade to version 8.33.0 or later
• Monitor for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected deployments and potential impact require further verification. Defenders should verify if the deployment uses a dual-stack or NAT64-enabled environment, check if the Gotenberg version is earlier than 8.33.0, and monitor for potential exploitation attempts. The vulnerability allows an unauthenticated attacker to reach cloud metadata services, potentially exposing cloud credentials.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.