CVE-2025-59476

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-17 · updated 2026-06-17
Weakness: CWE-117

Description

Jenkins 2.527 and earlier, LTS 2.516.2 and earlier does not restrict or transform the characters that can be inserted from user-specified content in log messages, allowing attackers able to control log message contents to insert line break characters, followed by forged log messages that may mislead administrators reviewing log output.

Affected products

Jenkins: before 2.516.3; before 2.528 — fixed in 2.516.3, 2.528

How to fix

Upgrade to a fixed version: Jenkins 2.516.3, 2.528. Check the vendor advisory for mitigations.

References

https://www.jenkins.io/security/advisory/2025-09-17/#SECURITY-3424
http://www.openwall.com/lists/oss-security/2025/09/17/1

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