CVE-2026-48758
sigstore-js: DSSE payloadType type-binding failure
CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | sigstore |
| Product | sigstore-js |
| Published | Jul 14, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
sigstore / sigstore-js
< 3.2.1
References
github.com: https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c github.com: https://github.com/sigstore/sigstore-js/pull/1657 github.com: https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7 github.com: https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1