November 15, 2026

CVE Watchtower

CVE-2026-73637Apache Http Server Use After Free

NVDCVSS scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Vulnerability Summary

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.
Severity Level
HIGH(7.3)
Published Date
Oct 1, 2026
Last Modified
Oct 5, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.47%Probability
Root Weakness (CWE)
CWE-416: Use After Free β†—
The product reuses or references memory after it has been freed, which can cause a crash or execution of arbitrary code.
CVSS v3.1 Base Metrics — Score 7.3 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityLow
AvailabilityLow

Affected & Patched Versions

Affected Versions
  • Apache Http Server >= 2.4.0 and < 2.4.69
Patched Versions
  • Apache Http Server 2.4.69

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run Apache Http Server and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Oct 1, 2026Published
  • Oct 5, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

Get notified about new Apache Http Server CVEsYou are reading CVE-2026-73637. Get an email when KEV listings, exploits or new CVEs match your stack.
Set up CVE alerts

Related Coverage

More Apache Http Server CVEs

External References

Data last checked: Nov 15, 2026 06:15 UTC