CVE-2026-84655

At a glance

Severity: MEDIUM 4.3
EPSS: EPSS 0.31 % · percentile 24 (2026-10-27)
State: PUBLISHED
Published: 2026-09-02
Updated: 2026-09-02
Assigner: jenkins
NVD status: Analyzed

Description

Jenkins 2.579 and earlier, LTS 2.568.2 and earlier does not escape map keys when serializing objects as JSON and Python through its REST API, allowing attackers able to control map property names to inject arbitrary fields into JSON and Python API responses.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	CISA-ADP
CVSS 3.1	MEDIUM 4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Weaknesses (CWE)

CWE-116

European references

ENISA EUVD · EUVD-2026-70121
GCVE · GCVE-0-2026-84655

Affected configurations (NVD CPE)

cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:* ≤ 2.568.2
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:* ≤ 2.579

Affected products

Product	Versions
Jenkins Project · Jenkins	unaffected 2.580 < * ; unaffected 2.568.3 < 2.568.*

References

https://www.jenkins.io/security/advisory/2026-09-02/#SECURITY-3879

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD