CVE-2026-118763 @sigstore/oci sends the registry Authorization header to a cross-host blob-upload Location
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118763?
CVE-2026-118763 is a high-severity vulnerability in sigstore-js, published on 29 Oct 2026.
Official description
sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 0.7.2, packages/oci/src/registry.ts contains a RegistryClient.signIn() method that stores registry Authorization and Docker configuration headers as defaults on a shared HTTP client, while RegistryClient.uploadBlob() sends a fresh PUT to an absolute blob-upload Location supplied by the registry without checking that its origin or scheme matches the registry. A malicious or compromised registry can therefore direct a user pushing an artifact through attachArtifactToImage() to an attacker-controlled host and receive the registry bearer token, Basic credentials, or custom authentication headers. Redirect-time header stripping does not prevent the leak because the cross-host PUT is a new explicit request rather than a followed redirect. This is a residual of CVE-2026-59891, whose fix changed credential selection in credentials.ts but did not constrain where credentials are sent from registry.ts. Version 0.7.2 fixes the issue by separating registry credentials from client-wide defaults and sending them only to the registry origin.
Weakness: CWE-522
Which versions are affected by CVE-2026-118763?
How do I fix CVE-2026-118763?
No fix has been published for CVE-2026-118763 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118763 being exploited?
There is no known exploitation of CVE-2026-118763 in the wild and no public exploit code.
Sources
Also known as GHSA-j63v-mwhm-56jx.