CVE-2026-48758
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 3.1
- 5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L - EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-25)
- CWE
- CWE-347
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jfc7-64v2-mr8c | npm | @sigstore/core | <3.2.1 | 3.2.1 |
References
- https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7
- 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