CVE-2026-57941

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

Apache Software Foundation Apache HTTP ServerWeb servers

CVSS

9.8Critical

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)0.60%Chance of exploitation activity in the next 30 days, higher than 48% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed inNone listedNo source names a fixed version. Check the vendor advisory below

Published1 Oct 2026Updated 1 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List