CVE-2025-59391

Name	CVE-2025-59391
Description	A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1122290

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libcoap3 (PTS)	bookworm	4.3.1-1	vulnerable
	trixie	4.3.4-1.1+deb13u1	vulnerable
	forky, sid	4.3.5-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libcoap3	source	(unstable)	(unfixed)			1122290

Notes

[trixie] - libcoap3 <no-dsa> (Minor issue)
[bookworm] - libcoap3 <no-dsa> (Minor issue)
https://github.com/obgm/libcoap/pull/1730
Fixed by: https://github.com/obgm/libcoap/commit/da534de75edd1b3628a28908d30b0efbaa01be09 (develop)
Fixed by: https://github.com/obgm/libcoap/commit/d56fb48bffd625f779eaf4616ccda62e1a7f6fd3 (v4.3.5a)