CVE-2025-49630

NameCVE-2025-49630
DescriptionIn certain proxy configurations, a denial of service attack against Apache HTTP Server versions 2.4.26 through to 2.4.63 can be triggered by untrusted clients causing an assertion in mod_proxy_http2. Configurations affected are a reverse proxy is configured for an HTTP/2 backend, with ProxyPreserveHost set to "on".
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-4270-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
apache2 (PTS)bullseye2.4.62-1~deb11u1vulnerable
bullseye (security)2.4.65-1~deb11u1fixed
bookworm2.4.65-1~deb12u1fixed
bookworm (security)2.4.62-1~deb12u2vulnerable
trixie2.4.65-2fixed
forky, sid2.4.65-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
apache2sourcebullseye2.4.65-1~deb11u1DLA-4270-1
apache2sourcebookworm2.4.65-1~deb12u1
apache2source(unstable)2.4.64-1

Notes

https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2025-49630
Fixed by: https://github.com/apache/httpd/commit/88304321841a2fe8bd5eacc70e69418b0b545ca5

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