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CVE Record

CVE-2026-33001: Jenkins 2.554 and earlier, LTS 2.541.2 and earlier does not safely handle symbolic links during the extract...

Jenkins 2.554 and earlier, LTS 2.541.2 and earlier does not safely handle symbolic links during the extraction of .tar and .tar.gz archives, allowing crafted archives to write files to arbitrary locations on the filesystem, restricted only by file system access permissions of the user running Jenkins. This can be exploited to deploy malicious scripts or plugins on the controller by attackers with Item/Configure permission, or able to control agent processes.

HighCVSS 8.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw lets a lower-privileged Jenkins user or controlled agent cause archive extraction to write files outside the intended location. On a Jenkins controller, that can mean planting malicious scripts or plugins, creating a direct path to compromise the CI/CD system.

Executive priority

Treat as a high-priority CI/CD platform risk. A compromised Jenkins controller can affect software delivery, secrets, build integrity, and downstream production environments.

Technical view

Jenkins mishandles symbolic links while extracting .tar and .tar.gz archives. Crafted archives can write arbitrary files where the Jenkins OS account has permission. The issue is CVSS 8.8 and maps to path traversal and symbolic link following weaknesses.

Likely exposure

Organizations running Jenkins 2.554 or earlier, or LTS 2.541.2 or earlier, are the stated exposure. Risk is higher where users have Item/Configure permission or where untrusted parties can influence agent processes.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires low privileges in Jenkins or control of an agent process, but no user interaction is required according to the CVSS vector.

Researcher notes

Focus validation on archive extraction paths involving symlinks, controller file writes, Item/Configure authorization, and agent-controlled inputs. The bundle supports arbitrary file write impact but does not provide exploit telemetry.

Mitigation direction

  • Review the Jenkins advisory for fixed versions and upgrade guidance.
  • Prioritize Jenkins controllers at or below 2.554 or LTS 2.541.2.
  • Restrict Item/Configure permission to trusted administrators only.
  • Review agent trust boundaries and remove untrusted agent control paths.
  • Check Red Hat advisories if using packaged Jenkins components.

Validation and detection

  • Inventory Jenkins controller versions and compare against the affected ranges.
  • List users and groups with Item/Configure permission.
  • Review recent job configuration changes involving archive extraction.
  • Inspect Jenkins controller filesystem changes under the Jenkins OS account.
  • Check installed plugins and scripts for unexpected additions.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-22: File access and web shell behavior lookup

File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cwe · low confidence lookup

CWE-59: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-33001 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
15Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.8CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9CISA-ADP
8.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H26redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.8High
CVSS 3.1 vector shape for CVE-2026-33001Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
redhat-SADPjenkins: Jenkins: Arbitrary file write and potential code execution through crafted archives
other:Red Hat severity ratingcvssV3_1
  • 2026-03-18T16:02:14.310Z: Reported to Red Hat.
  • 2026-03-18T15:15:23.950Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Jenkins ProjectJenkins2.555, 2.541.3affected
Weakness

CWE details

CWE-22CWE-59

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-22 · source CWE mapping

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs
CWE-59 · source CWE mapping

Improper Link Resolution Before File Access ('Link Following')

Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs