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CVE-2026-39829

7.5 · HIGH

The RSA and DSA public key parsers did not enforce size limits on key parameters.

Published May 22, 2026CWE-347EPSS 0.62%

Overview

CVE-2026-39829 is a high-severity vulnerability. It was published on May 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The RSA and DSA public key parsers did not enforce size limits on key parameters. A crafted public key with an excessively large modulus or DSA parameter could cause several minutes of CPU consumption during signature verification. This could be triggered by unauthenticated clients during public key authentication. RSA moduli are now limited to 8192 bits, and DSA parameters are validated per FIPS 186-2.

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

Refgo.dev/cl/781641Refgo.dev/cl/781661Refgo.dev/issue/79565Refgroups.google.com/g/golang-announce/c/a082jnz-LvIRefpkg.go.dev/vuln/GO-2026-5018Refaccess.redhat.com/errata/RHSA-2026:26546Refaccess.redhat.com/errata/RHSA-2026:26547Refaccess.redhat.com/errata/RHSA-2026:29455Refaccess.redhat.com/errata/RHSA-2026:35833Refaccess.redhat.com/errata/RHSA-2026:36199

How CyberStrike helps

Frequently asked questions

What is CVE-2026-39829?

CVE-2026-39829 is a high-severity vulnerability. It was published on May 22, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-39829?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-39829?

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-2026-39829?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-39829 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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