CVE catalog

CVE-2026-9828

Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection albeit heavily restricted. More precisel

[CVE catalog]

Severity: Medium · CVSS 4.8CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Published: May 28, 2026, 12:52:45 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.37% · Oct 25, 2026

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 objects from classes in the java.lang and java.util packages that are not explicitly blocked. 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 1.5.32 inclusive.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	logback	sid	`1:1.6.3-3`	fixed
Debian	logback	forky	`1:1.6.3-3`	fixed
Debian	logback	trixie	`1:1.2.11-6`	vulnerable
Debian	logback	bookworm	`1:1.2.11-3`	vulnerable
Cpe	logback	Not reported	Not reported	vulnerable
Opensuse	logback	tumbleweed	`1.5.34-2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	logback	source	sid	`1:1.6.3-1`	not yet assigned	Not reported	[1138632]
Debian	logback	source	forky	`1:1.6.3-1`	not yet assigned	Not reported	[1138632]
Debian	logback	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1138632]
Debian	logback	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1138632]
Opensuse	logback	rpm	tumbleweed	`1.5.34-2.1`	Not reported	OPENSUSE-SU-2026:11016-1	Not reported

[Debian bug #1138632]

Notes

[trixie] logback: Minor issue [bookworm] logback: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[liblogback-java]Affected
Source package: [logback]
Details (2)
- 1:1.2.11-3 · all · bookworm
  Affected
  nvd · logback · debian · bookworm; nvd · logback · debian · 12
- 1:1.2.11-3 · all · bookworm
  Affected
  nvd · logback · debian · bookworm; nvd · logback · debian · 12
[liblogback-java-doc]Affected
Source package: [logback]
Details (2)
- 1:1.2.11-3 · all · bookworm
  Affected
  nvd · logback · debian · bookworm; nvd · logback · debian · 12
- 1:1.2.11-3 · all · bookworm
  Affected
  nvd · logback · debian · bookworm; nvd · logback · debian · 12

[Debian 13 (Trixie)]

[liblogback-java]Affected
Source package: [logback]
Details (2)
- 1:1.2.11-6 · all · trixie
  Affected
  nvd · logback · debian · 13
- 1:1.2.11-6 · all · trixie
  Affected
  nvd · logback · debian · 13

[openSUSE Tumbleweed]

[logback-access]Unknown
Source package: [logback]
Details (1)
- 1.6.0-1.1 · noarch · tumbleweed
  Unknown · Fixed: 1.5.34-2.1
  Version impact unknown
  nvd · logback · opensuse · tumbleweed
[logback-examples]Unknown
Source package: [logback]
Details (1)
- 1.6.0-1.1 · noarch · tumbleweed
  Unknown · Fixed: 1.5.34-2.1
  Version impact unknown
  nvd · logback · opensuse · tumbleweed
[logback-javadoc]Unknown
Source package: [logback]
Details (1)
- 1.6.0-1.1 · noarch · tumbleweed
  Unknown · Fixed: 1.5.34-2.1
  Version impact unknown
  nvd · logback · opensuse · tumbleweed
[logback]Fixed
Source package: [logback]
Details (1)
- 1.6.0-1.1 · noarch · tumbleweed
  Fixed · Fixed: 1.5.34-2.1
  nvd · logback · opensuse · tumbleweed

Observed: Oct 27, 2026, 10:28:07 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]