Critical severity · published Oct 1, 2026
CVE-2026-57941
Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy
9.8
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HS
HTTP Server · Apache
2.4.0 through 2.4.68 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57941
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-57941
vendor-advisory
https://httpd.apache.org/security/vulnerabilities_24.html
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