---
id: CVE-2026-57941
title: "Use After Free vulnerability in Apache HTTP Server's mod_http2\_via shared session->bbtmp re-entrancy\n\n\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68."
summary: "Use After Free vulnerability in Apache HTTP Server's mod_http2\_via shared session->bbtmp re-entrancy\n\n\n\nThis issue affects Apache HTTP Server: from 2.4.0 through 2.4.68."
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-416
vendor: apache
product: http_server
affected:
  - 'http_server >= 2.4.0, < 2.4.69'
patched:
  - http_server 2.4.69
published: '2026-10-01'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T13:29:16.297'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57941'
references:
  - url: 'https://httpd.apache.org/security/vulnerabilities_24.html'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/10/01/19'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57941.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-57941'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2544864'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-57941'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-57941'
  - url: 'https://access.redhat.com/errata/RHSA-2026:74858'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00572
epssPercentile: 0.47105
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-01T19:06:52.698741Z'
ingestedAt: '2026-10-01T18:55:42.362Z'
scores:
  nvd: 9.8
  vendor: 7
---

## Overview

Use After Free vulnerability in Apache HTTP Server's mod_http2 via shared session->bbtmp re-entrancy



This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.

## Affected

- `http_server >= 2.4.0, < 2.4.69`

## Remediation

Upgrade past the affected range:

- `http_server 2.4.69`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Core Services · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57941.json)
- **RHSA-2026:74858** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:74858)