Is CVE-2026-42508 actively exploited?

No active exploitation of CVE-2026-42508 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42508 be exploited remotely?

Yes. CVE-2026-42508 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42508?

CVE-2026-42508 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-42508

Published: May 22, 2026· Updated: May 28, 2026

9.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.8th

Official Description

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.

NVD Source

Risk Analysis

This critical vulnerability in the golang:crypto package stems from an incorrect check for revoked 'SignatureKey' belonging to a CA. Previously, revoked keys were not properly identified, leading to potential trust issues. With a CVSS score of 9.1, this flaw poses a significant risk to the integrity of certificate validation.

No public exploit is currently known for this vulnerability. The flaw is remotely exploitable (AV:N) without requiring any authentication (PR:N) or user interaction (UI:N).

Recommended Action

Update the golang:crypto package to a version that correctly checks both the 'key' and 'key.SignatureKey' for revocation status. Ensure all applications using this package are updated.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-42508 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.