CVE-2026-10532

Name	CVE-2026-10532
Description	Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection, albeit heavily restricted. More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate Proxy objects. Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions. This issue affects logback: through 1.5.33 inclusive.
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
logback (PTS)	bullseye	1:1.2.3-6	vulnerable
	bookworm	1:1.2.11-3	vulnerable
	forky, sid, trixie	1:1.2.11-6	vulnerable

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

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

[trixie] - logback <no-dsa> (Minor issue)
[bookworm] - logback <no-dsa> (Minor issue)
https://logback.qos.ch/news.html#1.5.34