2.9

CVE-2026-9828: qos.ch sarl logback Deserialization of Untrusted Data

CVSS: 2.9v4.0LowDeferred
AliasesUBUNTU-CVE-2026-9828DEBIAN-CVE-2026-9828CGA-3499-jxmr-9wrr
Published 28-05-2026Last modified 29-05-2026
Open JSON

Vulnerability summary

CVE-2026-9828 is a low (CVSS 2.9) Deserialization of Untrusted Data vulnerability in qos.ch sarl logback. EPSS estimates a 0.55% chance of exploitation in the next 30 days, higher than 44.6% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
2.9/10
010
Low · v4.0 (CVE.org)
EPSS score
0.55%
0%100%
Low · +0.17 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 0 · Related 1
CGA-CWXR-C5VF-P22P

Timeline

  1. 28-05-2026
    PublishedVulnerability first disclosed.
  2. 29-05-2026
    Last modifiedVulnerability information updated.

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 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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.55%

Chance of exploitation in the next 30 days

Percentile

45%

Versus all other CVEs

30-day change

+0.17 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.55%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard81 products
  • airbyte-server< 2.0.0-r4
  • airbyte-server-fips< 2.0.0-r5
  • akhq< 0.27.1-r7
  • cassandra-4.0All versions (No fix recorded)
  • cassandra-4.1All versions (No fix recorded)
Wolfi17 products
  • akhq< 0.27.1-r7
  • cassandra-4.1All versions (No fix recorded)
  • cassandra-5.0< 5.0.8-r8
  • cassandra-reaper< 4.2.5-r4
  • dependency-track< 4.14.4-r0
Ch.qos.logback1 product
  • logback-core< 1.5.33
Debian1 product
  • logbackAll versions (No fix recorded) | < 1:1.6.3-1
Opensuse1 product
  • logback&distro=openSUSE Tumbleweed< 1.5.34-2.1
Qos.ch sarl1 product
Ubuntu1 product
  • logbackAll versions (No fix recorded)

7 vendors · 103 products

References

8 links