CVE-2026-57941
published 2026-10-01CVE-2026-57941: 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…
PriorityP355critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.57%
47.0th percentile
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
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | >= 2.4.0 < 2.4.69 | 2.4.69 |
| apache | httpd | — | — |
| apache_software_foundation | apache_http_server | 2.4.0 – 2.4.68 | — |
| httpd_2.4 | httpd | — | — |
| httpd_2.4 | mod_http2 | — | — |
| ubuntu | apache2 | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat9.8CRITICAL
vendor_ubuntu9.8CRITICAL
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2026-10-07·CVSS 9.8
CVE-2026-59797 [CRITICAL] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
It was discovered that Apache HTTP Server's mod_rewrite module incorrectly
handled memory when performing certain variable lookups. A remote attacker
could possibly use this issue to cause a denial of service or execute
arbitrary code. (CVE-2026-56154)
Lucian Nitescu, Simon Kappel, and Gianluca Danesin discovered that Apache
HTTP Server's mod_http2 module incorrectly handled memory when processing
certain HTTP/2 connections. A remote attacker could possibly use this issue
to cause a denial of service or execute arbitrary code. This issue only
affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04
LTS, and Ubuntu 26.04 LTS. (CVE-2026-57941)
Juthawong Naisangu
Red Hat
httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
vendor_redhat·2026-10-01·CVSS 9.8
CVE-2026-57941 [CRITICAL] CWE-416 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
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.
A flaw was found in the mod_http2 module of Apache HTTP Server. A remote, unauthenticated attacker could exploit a use-after-free condition—where memory is accessed after being released—through re-entrant processing of shared session buffers. This flaw can allow an attacker to potentially execute arbitrary code or crash the server, resulting in a Denial of Service (DoS).
Statement: A use-after-free flaw was found in mod_http2, the HTTP/2 module for the Apache HTTP Server. A remote attacker with no privileges can trigger r
GHSA
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.
ghsa_unreviewed·2026-10-01
CVE-2026-57941 [CRITICAL] CWE-416 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.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-57941 mod_http2: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
bugzilla·2026-10-09·CVSS 9.8
CVE-2026-57941 [CRITICAL] CVE-2026-57941 mod_http2: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
CVE-2026-57941 mod_http2: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
bugzilla·2026-10-09·CVSS 9.8
CVE-2026-57941 [CRITICAL] CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
bugzilla·2026-10-01·CVSS 9.8
CVE-2026-57941 [CRITICAL] CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
CVE-2026-57941 httpd: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
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.
2026-10-01
Published