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.
Loading...
Loading...
Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-04. NVD baseline CVSS 8.8; sources differ by 0.0.
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.
May 4, 2026
May 4, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libapache2-mod-proxy-uwsgi (2.4.58-1ubuntu8.12) @ noble | 2026-06-03 | ubuntu |
| redhat | httpd-main-2.4.67-0.1.hum1 | 2026-05-06 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (5 GitHub PoCs) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Apache HTTP Server 2.4.66 - 'mod_http2' Double-Free Denial of Service
Open source ↗Double-free in Apache httpd mod_http2 stream cleanup leading to pre-auth RCE.
Open source ↗Proof-of-Concept exploit for CVE-2026-23918 (Apache mod_http2 double-free). Features multi-mode DoS (Rapid-RST, Slow-Drip) and passive RCE/vulnerability detection for Apache 2.4.66.
Open source ↗Apache HTTP/2 double-free vulnerability PoC (CVE-2026-23918)
Open source ↗Elite reconnaissance script for auditing Apache's HTTP/2 stack against memory corruption (CVE-2026-23918). Features ALPN protocol forcing and monochrome dashboard intelligence. Built for Blue Teams and Security Researchers.
Open source ↗This repository contains a Proof of Concept (PoC) demonstrating the Double Free vulnerability (CVE-2026-23918) in Apache HTTP Server 2.4.66 `mod_http2`.
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-23918
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.
msrc · redhat
CWE-415