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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-js/pull/1657
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7
X_Refsource_Misc x_refsource_misc
https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1
Scores
CVSS v3
5.4
EPSS
0.0020
EPSS Percentile
9.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-347
Status
published
Products (1)
sigstore/sigstore-js
< 3.2.1
Published
Jul 14, 2026
Tracked Since
Jul 15, 2026