Description
Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0.

Users are recommended to upgrade to version 2.4.69, which fixes this issue.
Published: 2026-10-01
Score: 7.3 High
EPSS: < 1% Very Low
KEV: No
Impact: Authentication state corruption leading to denial of service
Action: Apply Patch
AI Analysis

Impact

Use‑after‑free in mod_auth_digest (CWE‑416) allows an unauthenticated remote client to corrupt authentication state by sending concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. The corrupted state can cause authentication failures or a denial of service.

Affected Systems

Apache Software Foundation Apache HTTP Server versions earlier than 2.4.69 on all platforms are affected.

Risk and Exploitability

The vulnerability can be triggered by any remote client that can issue Digest authentication requests. The CVSS score of 7.3 indicates a high severity, and the EPSS score of < 1% shows a very low but nonzero likelihood of exploitation. It is not listed in the CISA KEV catalog. Exploits would most likely involve sending multiple concurrent Digest requests to corrupt the server’s authentication state, potentially interrupting service availability.

Generated by OpenCVE AI on October 2, 2026 at 14:54 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Apache HTTP Server to version 2.4.69 or newer.
  • If an immediate upgrade is not feasible, disable AuthDigestNcCheck or set AuthDigestNonceLifetime to a non‑zero value to prevent concurrent digest request exploitation.
  • Monitor server logs for repeated Digest authentication attempts and enforce rate limiting or access controls to mitigate the risk of concurrent requests.

Generated by OpenCVE AI on October 2, 2026 at 14:54 UTC.

Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6569-1 apache2 security update
Ubuntu USN Ubuntu USN USN-8931-1 Apache HTTP Server vulnerabilities
History

Mon, 05 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
First Time appeared Apache http Server
CPEs cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Vendors & Products Apache http Server

Fri, 02 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-825
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

 threat_severity

Moderate

Thu, 01 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 01 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'}

Thu, 01 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache apache Http Server
Vendors & Products Apache
Apache apache Http Server

Thu, 01 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description Use after free in mod_auth_digest in Apache Software Foundation Apache HTTP Server before 2.4.69 on all platforms allows an unauthenticated remote client to cause authentication state corruption via concurrent Digest authentication requests when AuthDigestNcCheck is enabled or AuthDigestNonceLifetime is set to 0. Users are recommended to upgrade to version 2.4.69, which fixes this issue.
Title Apache HTTP Server: mod_auth_digest DoS attack
Weaknesses CWE-416
References

Subscriptions

Apache Apache Http Server Http Server
Redhat Hummingbird
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-01T20:09:34.038Z

Reserved: 2026-08-13T12:48:43.755Z

Link: CVE-2026-73637

cve-icon Vulnrichment

Updated: 2026-10-01T20:09:34.038Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-01T17:17:31.000

Modified: 2026-10-05T17:39:38.120

Link: CVE-2026-73637

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-01T16:18:30Z

Links: CVE-2026-73637 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-02T15:00:13Z

Weaknesses