critical 9.8

CVE-2026-57941 in the critical feed json

Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy

published 2026-10-01 38 d ago modified 2026-10-06 33 d ago also BIT-apache-2026-57941 , EUVD-2026-90896

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 6

bitnami apache 2.4.69
apache http_server 2.4.69

debian ubuntu red hat suse alpine azure linux

apache2 Debian 13 2.4.69-1~deb13u1
apache2 Debian 14 2.4.69-1

debian advisories DEBIAN-CVE-2026-57941

apache2 Ubuntu 22.04 LTS 2.4.52-1ubuntu4.24
apache2 Ubuntu 24.04 LTS 2.4.58-1ubuntu8.16
apache2 Ubuntu 26.04 LTS 2.4.66-2ubuntu2.5
apache2 Ubuntu Pro 18.04 LTS 2.4.29-1ubuntu4.27+esm12
apache2 Ubuntu Pro 20.04 LTS 2.4.41-4ubuntu3.23+esm8

ubuntu advisories UBUNTU-CVE-2026-57941

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

httpd hummingbird 1 2.4.69-1.hum1
mod_lua hummingbird 1 2.4.69-1.hum1
mod_ssl hummingbird 1 2.4.69-1.hum1
mod_ldap hummingbird 1 2.4.69-1.hum1
httpd-core hummingbird 1 2.4.69-1.hum1
httpd-tools hummingbird 1 2.4.69-1.hum1
mod_session hummingbird 1 2.4.69-1.hum1
httpd-manual hummingbird 1 2.4.69-1.hum1

red hat advisories RHSA-2026:74858

apache2 SLE Module for Basesystem 15 SP7 2.4.66-150700.4.26.1
apache2-event SLE Module for Package Hub 15 SP7 2.4.66-150700.4.26.1
apache2-utils SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
apache2-manual SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
apache2-worker SLE Module for Server Applications 15 SP7 2.4.66-150700.4.26.1
apache2-prefork SLE Module for Basesystem 15 SP7 2.4.66-150700.4.26.1
apache2 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 2.4.66-150400.6.60.1
apache2 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 2.4.66-35.84.1

suse advisories SUSE-SU-2026:5099-1 SUSE-SU-2026:5077-1 SUSE-SU-2026:5076-1 SUSE-SU-2026:5075-1

apache2 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 2.4.69-r0

alpine advisories ALPINE-CVE-2026-57941

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

httpd Azure Linux 3.0 2.4.69-1

azure linux advisories AZL-106482

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-57941 updated 2026-11-05 cvss 7.0

httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy

Red Hat Enterprise Linux 9 mod_http2 Red Hat Enterprise Linux 10 mod_http2 Red Hat JBoss Core Services jbcs-httpd24-mod_http2
affected: workaround, no fix available
Red Hat Hardened Images httpd 2.4.69-1.hum1, mod_lua 2.4.69-1.hum1, mod_ssl 2.4.69-1.hum1, mod_ldap 2.4.69-1.hum1, httpd-core 2.4.69-1.hum1, httpd-tools 2.4.69-1.hum1, +4 more
fixed: vendor fix RHSA-2026:74858
Red Hat Enterprise Linux 6 httpd, mod_ssl, httpd-tools, httpd-manual Red Hat Enterprise Linux 7 httpd, mod_ssl, mod_ldap, httpd-tools, mod_session, httpd-manual, +1 more Red Hat Enterprise Linux 8 httpd, mod_md, mod_ssl, mod_ldap, mod_http2, httpd-tools, +4 more Red Hat Enterprise Linux 9 httpd, mod_lua, mod_ssl, mod_ldap, httpd-core, httpd-tools, +4 more Red Hat Enterprise Linux 10 httpd
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 38 d ago (2026-10-01)

Exploit prediction

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
OSV	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
bitnami	apache	>=2.4.0, <2.4.69	2.4.69

Affected products

Apache Software Foundation Apache HTTP Server

Classification

Weakness

CWE-416 Use After Free

Technology feeds

Apache HTTP Server rss critical rss

References

httpd.apache.org /security/vulnerabilities_24.html
vendor-advisory, advisory
openwall.com /lists/oss-security/2026/10/01/19
mailing-list, third-party-advisory, advisory
nvd.nist.gov /vuln/detail/CVE-2026-57941
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary