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

Critical · CVSS 9.8CVE-2026-57941

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

Answer in brief

CVE-2026-57941 records a Critical severity (CVSS 9.8) vulnerability in Apache HTTP Server: mod_http2 use-after-free / wild write via shared session->bbtmp re-entrancy. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache HTTP Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.8
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache HTTP Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Apache Software Foundation/Apache HTTP Servergeneric	>=2.4.0 <=2.4.68	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache HTTP Server.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Source referencehttpd.apache.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.