CVE-2026-48758
Medium
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.
SeverityMedium
CVSS5.4
Exploit probability—
Product@sigstore/core
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- @sigstore/core3.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @sigstore/corenpm | v < 3.2.1 | 3.2.1 |
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