CVE-2025-9648

Name	CVE-2025-9648
Description	A vulnerability in the CivetWeb library's function mg_handle_form_request allows remote attackers to trigger a denial of service (DoS) condition. By sending a specially crafted HTTP POST request containing a null byte in the payload, the server enters an infinite loop during form data parsing. Multiple malicious requests will result in complete CPU exhaustion and render the service unresponsive to further requests. This issue was fixed in commit 782e189. This issue affects only the library, standalone executable pre-built by vendor is not affected.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
civetweb (PTS)	bullseye	1.13+dfsg-5	vulnerable
	bookworm	1.15+dfsg-4	vulnerable
	forky, trixie	1.16+dfsg-2	vulnerable
	sid	1.16+dfsg-3	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
civetweb	source	(unstable)	(unfixed)

Notes

[bullseye] - civetweb <postponed> (minor issue; DoS)
https://github.com/civetweb/civetweb/issues/1348
https://github.com/civetweb/civetweb/commit/782e18903515f43bafbf2e668994e82bdfa51133