CVE-2026-88887 Renovate before 44.11.2 Credential Exfiltration via Link Header

Critical 9.2 Published 10 Sep 2026 Updated 29 Sep 2026

A malicious registry can exfiltrate credentials by supplying cross-origin pagination links, affecting Renovate users with container dependencies.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-88887?

CVE-2026-88887 is a critical server-side request forgery vulnerability in mend-renovate-ce, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Renovate is a dependency update automation tool. When listing tags/digests for a container image, Renovate follows pagination links supplied by the remote registry in the HTTP Link header and attaches the registry credentials to the follow-up request without verifying that the pagination URL has the same origin as the original registry. A malicious or compromised container registry can therefore specify a Link header pointing to an attacker-controlled host and receive the credentials Renovate uses for that registry. Exploitation requires that the target has container (Docker) dependencies and is already interacting with the malicious or compromised registry. This is fixed in Renovate 44.11.2 (npm and renovate/renovate images), Mend Renovate CE/EE 15.4.0 and the mend-renovate-enterprise-edition Helm chart 10.4.0; the same-origin check can be disabled with RENOVATE_X_DOCKER_PAGINATION_ALLOW_CROSS_ORIGIN.

Weakness: CWE-601

Which versions are affected by CVE-2026-88887?

How do I fix CVE-2026-88887?

No fix has been published for CVE-2026-88887 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2026-88887 being exploited?

There is no known exploitation of CVE-2026-88887 in the wild and no public exploit code.

Sources

Also known as GHSA-v73q-hvqx-hxwx, GHSA-xxxv-4m67-3vm5.