Vulnerability · Published Oct 29, 2026 · Assigned by GitHub_M
CVE-2026-118763@sigstore/oci sends the registry Authorization header to a cross-host blob-upload Location
High 7.4
In plain English
A high-severity security flaw in sigstore-js from sigstore. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @sigstore/oci | 0.7.2 | GHSA-j63v-mwhm-56jx |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| sigstore | sigstore-js | < 0.7.2 |
Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
References
- https://github.com/sigstore/sigstore-js/security/advisories/GHSA-j63v-mwhm-56jx x_refsource_CONFIRM
- https://github.com/sigstore/sigstore-js/pull/1762 x_refsource_MISC
- https://github.com/sigstore/sigstore-js/commit/b855f46cfe81f26481c6d3f4b333dfd00f2fd1b1 x_refsource_MISC
- https://github.com/sigstore/sigstore-js/commit/e4ca65c3ab3c675456ab9b0bd04217ceccad3558 x_refsource_MISC
- https://github.com/sigstore/sigstore-js/releases/tag/@sigstore/oci@0.7.2 x_refsource_MISC