Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f
- https://github.com/sigstore/sigstore-js/pull/1657
- https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1
- https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c
- https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c
FAQ
What is CVE-2026-48758?
CVE-2026-48758 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 str...
How severe is CVE-2026-48758?
CVE-2026-48758 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48758?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.