Improper Verification of Cryptographic Signature Affecting @sigstore/core package, versions <3.2.1
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Test your applications- Snyk IDSNYK-JS-SIGSTORECORE-17817061
- published4 Jul 2026
- disclosed26 Jun 2026
- creditUnknown
Introduced: 26 Jun 2026
NewCVE-2026-48758 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade @sigstore/core to version 3.2.1 or higher.
Overview
@sigstore/core is a Base library for Sigstore
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the preAuthEncoding function. An attacker can bypass type-binding guarantees by substituting characters in payloadType with Unicode variants that produce identical encoded bytes, allowing signature verification to succeed for altered types.