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CVE-2026-27135

7.5 · HIGH

nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C.

Published Mar 18, 2026CWE-617EPSS 0.93%

Overview

CVE-2026-27135 is a high-severity vulnerability. It was published on March 18, 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

nghttp2 is an implementation of the Hypertext Transfer Protocol version 2 in C. Prior to version 1.68.1, the nghttp2 library stops reading the incoming data when user facing public API `nghttp2_session_terminate_session` or `nghttp2_session_terminate_session2` is called by the application. They might be called internally by the library when it detects the situation that is subject to connection error. Due to the missing internal state validation, the library keeps reading the rest of the data after one of those APIs is called. Then receiving a malformed frame that causes FRAME_SIZE_ERROR causes assertion failure. nghttp2 v1.68.1 adds missing state validation to avoid assertion failure. No known workarounds are available.

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/nghttp2/nghttp2/commit/5c7df8fa815ac1004d9ecb9d1f7595c4d37f46e1GitHubgithub.com/nghttp2/nghttp2/security/advisories/GHSA-6933-cjhr-5qg6Refwww.openwall.com/lists/oss-security/2026/03/20/3Reflists.debian.org/debian-lts-announce/2026/05/msg00025.htmlRefaccess.redhat.com/errata/RHSA-2026:10065Refaccess.redhat.com/errata/RHSA-2026:11768Refaccess.redhat.com/errata/RHSA-2026:13812Refaccess.redhat.com/errata/RHSA-2026:14773Refaccess.redhat.com/errata/RHSA-2026:14937Refaccess.redhat.com/errata/RHSA-2026:15087

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27135?

CVE-2026-27135 is a high-severity vulnerability. It was published on March 18, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-27135?

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-2026-27135?

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-2026-27135?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27135 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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