CVE-2024-3651

Name	CVE-2024-3651
Description	A vulnerability was identified in the kjd/idna library, specifically within the `idna.encode()` function, affecting version 3.6. The issue arises from the function's handling of crafted input strings, which can lead to quadratic complexity and consequently, a denial of service condition. This vulnerability is triggered by a crafted input that causes the `idna.encode()` function to process the input with considerable computational load, significantly increasing the processing time in a quadratic manner relative to the input size.
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)
References	DLA-3811-1
Debian Bugs	1069127

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-idna (PTS)	bullseye	2.10-1+deb11u1	fixed
	bookworm	3.3-1+deb12u1	fixed
	forky, sid, trixie	3.10-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
python-idna	source	buster	2.6-1+deb10u1	DLA-3811-1
python-idna	source	bullseye	2.10-1+deb11u1
python-idna	source	bookworm	3.3-1+deb12u1
python-idna	source	(unstable)	3.6-2.1		1069127

Notes

https://github.com/kjd/idna/security/advisories/GHSA-jjg7-2v4v-x38h
https://bugzilla.redhat.com/show_bug.cgi?id=2274779
Fixed by: https://github.com/kjd/idna/commit/5beb28b9dd77912c0dd656d8b0fdba3eb80222e7 (v3.7)