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Vulnerability · Published May 4, 2026 · Assigned by apache

CVE-2026-23918Apache HTTP Server: http2: double free and possible RCE on early reset

High 8.8

In plain English

A high-severity double free in Apache HTTP Server from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 49.7% (higher than 99% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)49.7%top 1.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

Double Free and possible RCE vulnerability in Apache HTTP Server with the HTTP/2 protocol. This issue affects Apache HTTP Server: 2.4.66. Users are recommended to upgrade to version 2.4.67, which fixes the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20apache22.4.67-r0ALPINE-CVE-2026-23918
Alpine:v3.21apache22.4.67-r0ALPINE-CVE-2026-23918
Alpine:v3.22apache22.4.67-r0ALPINE-CVE-2026-23918
Alpine:v3.23apache22.4.67-r0ALPINE-CVE-2026-23918
Alpine:v3.24apache22.4.67-r0ALPINE-CVE-2026-23918
Debian:12apache22.4.67-1~deb12u2DEBIAN-CVE-2026-23918
Debian:13apache22.4.66-1~deb13u2DEBIAN-CVE-2026-23918
Debian:14apache22.4.66-5DEBIAN-CVE-2026-23918
Ubuntu:26.04:LTSapache22.4.66-2ubuntu2.1UBUNTU-CVE-2026-23918

Affected products (as reported)

VendorProductVersions
Apache Software Foundation Apache HTTP Server 2.4.66

Weakness: CWE-415, CWE-1341 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References