CVE-2026-57941 Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
Attackers can exploit a use-after-free flaw in Apache HTTP Server's mod_http2 module to potentially execute arbitrary code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57941?
CVE-2026-57941 is a critical use after free vulnerability in Apache Http Server, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-416
Which versions are affected by CVE-2026-57941?
1 open source package ship an affected version, including apache. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
apache Bitnami | From 2.4.0 | 2.4.69 |
Products include Apache Http Server.
How do I fix CVE-2026-57941?
Upgrade apache to 2.4.69 or later.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-57941 being exploited?
There is no known exploitation of CVE-2026-57941 in the wild and no public exploit code.
Other vulnerabilities in Apache Http Server
Sources
Also known as ALPINE-CVE-2026-57941, AZL-106074, AZL-106482, BELL-CVE-2026-57941, BIT-apache-2026-57941, CLSA-2026-1791564334 and 6 more.