CVE-2026-48758

mediumCVSS 5.4covered by 1 sourcefirst seen 2026-07-14

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.

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Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-48758: sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2…nvd · 2026-07-14

External references

NVD record for CVE-2026-48758

CVE.org record

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