Instructlab: instructlab: path traversal allows arbitrary directory creation and file write

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Summary

CVECVE-2026-6855
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-22 13:16:22 UTC
Updated2026-04-22 21:23:52 UTC
DescriptionA flaw was found in InstructLab. A local attacker could exploit a path traversal vulnerability in the chat session handler by manipulating the `logs_dir` parameter. This allows the attacker to create new directories and write files to arbitrary locations on the system, potentially leading to unauthorized data modification or disclosure.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

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

Problem Types: CWE-22 | CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-6855 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Martin Brodeur (independent security researcher) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-15T00:00:00.000ZReported to Red Hat.
CNA2026-04-15T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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