Insufficiently Protected Credentials Affecting @sigstore/oci package, versions <0.7.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-SIGSTOREOCI-22132210
- published2 Nov 2026
- disclosed29 Oct 2026
- creditArpit Jain
Introduced: 29 Oct 2026
NewCVE-2026-118763 (opens in a new tab)How to fix?
Upgrade @sigstore/oci to version 0.7.2 or higher.
Overview
@sigstore/oci is an OCI artifact support
Affected versions of this package are vulnerable to Insufficiently Protected Credentials via the uploadBlob() function in registry.ts, which follows redirect responses to cross-origin URLs without stripping credential headers. When a registry returns a redirect to a different host during a blob upload, the Authorization header - set globally via .defaults() in signIn() - is forwarded to the redirect target, allowing a malicious registry to harvest the caller's credentials.
PoC
Source-verified. No live push against a hostile registry was executed in this pass. Confirmed:
rg -n "defaults\(|HEADER_AUTHORIZATION|Location|new URL\(|this.#fetch\(uploadLocation" packages/oci/src/registry.ts
git log --oneline -3 -- packages/oci/src/credentials.ts packages/oci/src/registry.ts
signIn() sets Authorization via .defaults(); uploadBlob() PUTs to uploadLocation.href (which may be an absolute cross-host URL) with no host check; the GHSA-pf56 fix commit is the latest change to credentials.ts, while registry.ts has only dependency bumps since.
Note: The section describes static code analysis commands run against the repository source, with no specific runtime environment stated.