Medium severity5.4NVD Advisory· Published Jul 14, 2026· Updated Jul 15, 2026
CVE-2026-48758
CVE-2026-48758
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@sigstore/corenpm | < 3.2.1 | 3.2.1 |
Affected products
4- osv-coords3 versionspkg:apk/chainguard/graalvm-25-ce-nodejspkg:apk/chainguard/pulumi-language-nodejspkg:apk/wolfi/pulumi-language-nodejs
< 25.0.3-r9+ 2 more
- (no CPE)range: < 25.0.3-r9
- (no CPE)range: < 3.248.0-r1
- (no CPE)range: < 3.248.0-r1
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-jfc7-64v2-mr8cghsaADVISORY
- github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8cnvdWEB
- github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7nvd
- github.com/sigstore/sigstore-js/pull/1657nvd
- github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1nvd
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