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CVE-2026-48758

5.4 · MEDIUM

sigstore-js provides JavaScript libraries for interacting with Sigstore services.

Published Jul 14, 2026CWE-347EPSS 0.26%

Overview

CVE-2026-48758 is a medium-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7GitHubgithub.com/sigstore/sigstore-js/pull/1657GitHubgithub.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1GitHubgithub.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8cGitHubgithub.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-48758?

CVE-2026-48758 is a medium-severity vulnerability. It was published on July 14, 2026 and has a CVSS 3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2026-48758?

This vulnerability has a CVSS 3.1 base score of 5.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-48758?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-48758?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-48758 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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