CVE catalog

CVE-2026-73636

Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2.4.x on all platforms allows a man-in-the-middle (MITM) attacker to replay captured digest

[CVE catalog]

Severity: High · CVSS 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: Oct 1, 2026, 4:17:59 PM UTC
Updated: Oct 1, 2026, 5:17:30 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.40% · Oct 25, 2026

Authentication bypass by capture-replay in mod_auth_digest in Apache Software Foundation Apache HTTP Server 2.4.x on all platforms allows a man-in-the-middle (MITM) attacker to replay captured digest authentication credentials via crafted requests that trigger garbage collection of the client's shared memory entry when AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	apache2	sid	`2.4.69-1`	fixed
Debian	apache2	forky	`2.4.69-1`	fixed
Debian	apache2	trixie	`2.4.68-1~deb13u1`	vulnerable
Debian	apache2	trixie-security	`2.4.69-1~deb13u1`	fixed
Debian	apache2	bookworm	`2.4.68-1~deb12u1`	vulnerable
Debian	apache2	bookworm-security	`2.4.67-1~deb12u3`	vulnerable
Cpe	http_server	Not reported	`2.4.69`	fixed
Ubuntu	apache2	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-bin	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-data	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-dev	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-doc	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-ssl-dev	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-suexec-custom	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-suexec-pristine	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	apache2-utils	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	libapache2-mod-md	noble	`2.4.58-1ubuntu8.17`	fixed
Ubuntu	libapache2-mod-proxy-uwsgi	noble	`2.4.58-1ubuntu8.17`	fixed
Alpine	apache2	3.21	`2.4.69-r0`	fixed
Alpine	apache2	3.22	`2.4.69-r0`	fixed
Alpine	apache2	3.23	`2.4.69-r0`	fixed
Alpine	apache2	3.24	`2.4.69-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	apache2	source	sid	`2.4.69-1`	not yet assigned	Not reported	Not reported
Debian	apache2	source	forky	`2.4.69-1`	not yet assigned	Not reported	Not reported
Debian	apache2	source	trixie	`2.4.69-1~deb13u1`	not yet assigned	Not reported	Not reported
Debian	apache2	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Cpe	http_server	cpe	Not reported	`2.4.69`	Not reported	NVD-CVE-2026-73636	Not reported
Ubuntu	apache2	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-bin	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-data	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-dev	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-doc	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-ssl-dev	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-suexec-custom	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-suexec-pristine	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	apache2-utils	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	libapache2-mod-md	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Ubuntu	libapache2-mod-proxy-uwsgi	deb	noble	`2.4.58-1ubuntu8.17`	Not reported	Not reported	Not reported
Alpine	apache2	apk	3.21	`2.4.69-r0`	Not reported	ALPINE-CVE-2026-73636	Not reported
Alpine	apache2	apk	3.22	`2.4.69-r0`	Not reported	ALPINE-CVE-2026-73636	Not reported
Alpine	apache2	apk	3.23	`2.4.69-r0`	Not reported	ALPINE-CVE-2026-73636	Not reported
Alpine	apache2	apk	3.24	`2.4.69-r0`	Not reported	ALPINE-CVE-2026-73636	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[apache2]Affected
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-bin]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-data]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-dev]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-doc]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · all · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · all · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-ssl-dev]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-suexec-custom]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-suexec-pristine]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[apache2-utils]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[libapache2-mod-md]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
[libapache2-mod-proxy-uwsgi]Affected
Source package: [apache2]
Details (4)
- 2.4.68-1~deb12u1 · amd64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.68-1~deb12u1 · arm64 · bookworm
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · amd64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm
- 2.4.67-1~deb12u3 · arm64 · bookworm-security
  Affected
  nvd · apache2 · debian · bookworm

Observed: Oct 27, 2026, 5:00:07 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]