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TI-2026-08607 Aliases CVE-2026-9828GHSA-p47f-322f-whfh

Logback deserialization whitelist bypass for java.lang and java.util

Priority LOW 15CWE-502Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-502.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix Fixed logback (QOS.CH Sarl): 1.5.33ch.qos.logback:logback-core (Maven): 1.5.33

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QOS.CH Sarllogbackup to 1.5.321.5.33Patch availableCNA
—ch.qos.logback:logback-core (Maven)before 1.5.331.5.33Patch availableGHSA-p47f-322f-whfh
  • logback VendorQOS.CH Sarl Affected up to 1.5.32 Fixed in 1.5.33 Patch available CNA
  • ch.qos.logback:logback-core (Maven) Vendor— Affected before 1.5.33 Fixed in 1.5.33 Patch available GHSA-p47f-322f-whfh

Remediation

  • Fix · CNA logback (QOS.CH Sarl) Fixed in 1.5.33
  • Fix · GHSA-p47f-322f-whfh ch.qos.logback:logback-core (Maven) Fixed in 1.5.33 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-9828
  2. 2026-10-03 Alias added: GHSA-p47f-322f-whfh

References

Advisory 1

Other 2

  • TI-2026-11065 Incomplete protection against CVE-2025-11226 CVSS 4.0HIGH 7.0
  • TI-2025-10282 Conditional processing of logback.xml configuration file, in conjuction with Spring Framework and Janino CVSS 4.0HIGH 7.0
  • TI-2024-11860 JaninoEventEvaluator vulnerability CVSS 4.0MEDIUM 5.9
  • TI-2026-66127 Logback: Incomplete protection against CVE-2026-19880 CVSS 4.0MEDIUM 6.3
  • TI-2026-16116 Incomplete protection against CVE-2025-11226 CVSS 4.0MEDIUM 6.3
  • TI-2026-09059 Logback deserialization whitelist bypass for Proxy objects CVSS 4.0LOW 2.9
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences