Debian 11 Apache2 Critical DoS Advisory DLA-4620-1 CVE-2026-49975
debian lts
June 7, 2026
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 Covered
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
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Severity
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Critical
Package: apache2
Version: 2.4.67-1~deb11u2
CVE ID: CVE-2026-49975
Debian Bug: 1138750
Topics Covered
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