CVE-2025-59476: jenkins — Fix

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-117 CWE-117

Affected Products

Vendor	Product	Versions
jenkins	jenkins	< 2.516.3
jenkins	jenkins	< 2.528

References

Advisories & Patches

https://www.jenkins.io/security/advisory/2025-09-17/#SECURITY-3424

Other References

http://www.openwall.com/lists/oss-security/2025/09/17/1

Frequently Asked Questions

What is CVE-2025-59476? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-59476? +

CVE-2025-59476 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-59476? +

CVE-2025-59476 affects products from jenkins, specifically: jenkins. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59476? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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