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CVE-2026-48758
sigstore-js: DSSE payloadType type-binding failure
Medium5.4EPSS 0.24%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
| NVDNVD · Deferred | 3.1 | Medium5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.
Weakness
Affected products
- affected < 3.2.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@sigstore/coreGHSA-jfc7-64v2-mr8c (opens in a new tab)
References (4)
- https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/sigstore/sigstore-js/pull/1657 (opens in a new tab)x_refsource_MISC
- https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7 (opens in a new tab)x_refsource_MISC
- https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-jfc7-64v2-mr8c (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-48758)Record last updated .