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MEDIUM

CVE-2026-70427

CVSS v3

4.3

MEDIUM

EPSS Score

0.4 %

exploit probability, as of 2026-10-16

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • jenkinsBitnamiall versions · fixed in 2.568.2

Vendor advisories

  • CVE-2026-70427 Red Hat Product Security38 products fixed · 1 known affected

    jenkins: Jenkins: Arbitrary file write via crafted archives and symbolic links

    jenkins.src as a component of OpenShift Developer Tools and Services

  • RHSA-2026:60259 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.20 security update.

  • RHSA-2026:60256 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.22 security update.

  • RHSA-2026:60254 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.21 security update.

  • RHSA-2026:60252 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.19 security update.

  • RHSA-2026:60251 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.16 security update.

6 more advisories

Full record on NVD

Description

Jenkins 2.575 and earlier, LTS 2.568.1 and earlier does not safely handle symbolic links with effectively empty names during the extraction of `.tar` and `.tar.gz` archives, allowing attackers able to control agent processes to provide crafted archives to the controller to write files to arbitrary locations on the file system, restricted only by file system access permissions of the user running Jenkins.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Published
2026-08-05
Last Modified
2026-08-05

Frequently asked questions

What is CVE-2026-70427?

Jenkins 2.575 and earlier, LTS 2.568.1 and earlier does not safely handle symbolic links with effectively empty names during the extraction of `.tar` and `.tar.gz` archives, allowing attackers able to control agent processes to provide crafted archives to the controller to write files to arbitrary locations on the file system, restricted only by file system access permissions of the user running Jenkins.

Is CVE-2026-70427 actively exploited?

Active exploitation of CVE-2026-70427 has not been confirmed. Its EPSS score was 0.4% on 2026-10-16, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-70427?

CVE-2026-70427 has a CVSS v3 base score of 4.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

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