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: n/a
EPSS: n/a
KEV: No
Impact: Authentication state corruption leading to denial of service
Action: Apply Patch
AI Analysis

Impact

Use after free vulnerability in mod_auth_digest 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.

Affected Systems

Apache Software Foundation Apache HTTP Server versions prior to 2.4.69 on all platforms are affected.

Risk and Exploitability

The flaw can be exploited by any remote client that can send Digest authentication requests, potentially causing denial of service through corrupted state. No exploit probability score is available, and the vulnerability is not listed in CISA KEV. The impact is significant for systems relying on Digest authentication.

Generated by OpenCVE AI on October 1, 2026 at 17:49 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 configure 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 1, 2026 at 17:49 UTC.

Tracking

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Advisories

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History

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
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-01T16:18:30.190Z

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

Link: CVE-2026-73637

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-73637

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-01T18:15:10Z

Weaknesses