CVE-2026-48758

Summary

sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.

Affected Software

Weaknesses

• CWE-347: CWE-347: Improper Verification of Cryptographic Signature

References

• https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c
• https://github.com/sigstore/sigstore-js/pull/1657
• https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7
• https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1

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