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CVE-2026-63388

8.4 · HIGH

Libevent is an event notification library.

Published Aug 20, 2026CWE-617EPSS 0.14%

Overview

CVE-2026-63388 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.

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/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9GitHubgithub.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72GitHubgithub.com/libevent/libevent/releases/tag/release-2.1.13-stableGitHubgithub.com/libevent/libevent/releases/tag/release-2.2.2-alphaGitHubgithub.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63388?

CVE-2026-63388 is a high-severity vulnerability. It was published on August 20, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-63388?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-63388?

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-2026-63388?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63388 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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