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Debian LTS 11 Apache2 Critical DoS CVE-2026-49975 DLA-4620-1

debian lts
Calendar Grey June 7, 2026
Dist Debian Esm H88
Denial of Service vulnerability in Apache HTTP Server addressed in DLA-4620-1 for Debian LTS 11. Upgrade recommended.
It was discovered that incorrect cookie header accounting in the HTTP/2 implementation of the Apache HTTP server may result in denial of service (excessive resources consumption)
Topics%20covered

Topics Covered

security advisory denial of service critical apache2 CVE-2026-49975 deblts

Summary

For Debian 11 bullseye, this problem has been fixed in version
2.4.67-1~deb11u2.

We recommend that you upgrade your apache2 packages.

For the detailed security status of apache2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/apache2

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: apache2
Version: 2.4.67-1~deb11u2
CVE ID: CVE-2026-49975
Debian Bug: 1138750

Topics%20covered

Topics Covered

security advisory denial of service critical apache2 CVE-2026-49975 deblts

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