CVE-2026-57941: Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-05
Weakness: CWE-416

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.

Affected products

Apache HTTP Server: from 2.4.0 before 2.4.69 — fixed in 2.4.69

How to fix

Upgrade to a fixed version: Apache HTTP Server 2.4.69. Check the vendor advisory for mitigations.

References

https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2026/10/01/19

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