CVE-2026-78002

Name	CVE-2026-78002
Description	A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript `replace()` function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rsyslog (PTS)	bullseye (security), bullseye	8.2102.0-2+deb11u1	vulnerable
	bookworm	8.2302.0-1+deb12u1	vulnerable
	trixie	8.2504.0-1	vulnerable
	forky	8.2606.0-4	vulnerable
	sid	8.2608.0-3	vulnerable

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

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

[trixie] - rsyslog <no-dsa> (Minor issue)
https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3