---
title: "CVE-2026-23918\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-23918?format=md
keywords: index, follow
---

# CVE-2026-23918

Publication date 5 May 2026

Last updated 13 May 2026

---

Ubuntu priority

**High**

[Why this priority?](https://ubuntu.com/security/CVE-2026-23918?format=md#priority-reason )

## Cvss 3 Severity Score

**8.8 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-23918?format=md#impact-score)

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## 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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2026-23918?format=md#notes)

### Why is this CVE high priority?

This a potential remote code execution issue

[Learn more about Ubuntu priority](https://ubuntu.com/security/cves/about#priority)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| apache2 | 26.04 LTS resolute | Fixed 2.4.66-2ubuntu2.1 |
| 25.10 questing | Not affected |
| 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Not affected |
| 18.04 LTS bionic | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2026-23918?format=md#patch-details)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

Per upstream, this only affects Apache httpd 2.4.66.
After investigation, the core issue is still in earlier
releases, but without the memory allocator change in mod\_http2
v2.0.33 which went into httpd 2.4.66, it does not result in a
double-free. Marking releases earlier than resolute as
not-affected.

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| apache2 | * Upstream:   [e41e84e](https://github.com/apache/httpd/commit/e41e84e08e6186460e77a8357b5d5c571d33bd76) * Upstream:   [741b540](https://github.com/apache/httpd/commit/741b5406bb2f8a3601d5770ca67a1e338b0a6908) * Upstream:   [79e3aec](https://github.com/apache/httpd/commit/79e3aec44956e6436720176f6ff64263f053132c) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

8.8 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 8.8 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-23918)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-23918)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-23918)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-23918)

### Related Ubuntu Security Notices (USN)

+ [USN-8239-1](https://usn.ubuntu.com/USN-8239-1)
+ Apache HTTP Server vulnerabilities
+ 6 May 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-23918>