Bug 2531445 (CVE-2026-88882)

Summary: CVE-2026-88882 renovate: Renovate before 44.11.2 Credential Exfiltration via Link Header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gbenhaim, kaycoth, niyer, twaugh
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Renovate, a dependency update automation tool. When listing new package versions from a NuGet registry, Renovate follows pagination URLs provided in the HTTP `Link` header without verifying the target's origin. A malicious or compromised NuGet registry can exploit this by returning a `Link` header pointing to an attacker-controlled server. This can cause Renovate to send sensitive registry credentials to the attacker, leading to credential exfiltration.
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Description OSIDB Bzimport 2026-09-10 13:23:37 UTC 
Renovate is a dependency update automation tool. In versions before 44.11.2 (and Mend Renovate CE/EE images and charts before 15.4.0, and mend-renovate-enterprise-edition helm chart before 10.4.0), when listing new package versions from a NuGet registry Renovate follows pagination URLs supplied by the registry in the HTTP `Link` header without verifying that the target has the same origin as the configured registry. Registry credentials are attached to the request for the 'next' page, so a malicious or compromised NuGet registry can return a `Link` header pointing at an attacker-controlled server and cause Renovate to send the registry credentials to that server. Exploitation requires the remote registry to be malicious or compromised; such a registry would normally already have received the credentials on the initial request, so the issue primarily allows the credentials to be delivered to an additional, attacker-chosen host. The fix restricts pagination to the same origin; the previous behaviour can be re-enabled with the RENOVATE_X_NUGET_PAGINATION_ALLOW_CROSS_ORIGIN option.