CVE-2026-6855: A flaw was found in InstructLab

Routine

HIGH 7.1WATCHLISTMITIGATEMITIGATE

CVE-2026-6855 is a high-severity flaw (CVSS 7.1) affecting instructlab, enterprise linux ai. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A 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.

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 13:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

redhat instructlab MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy instructlab || rpm -q instructlab || instructlab --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

redhat enterprise linux ai MITIGATE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6855?

instructlab: mitigate or apply the listed mitigation; enterprise linux ai: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-6855 being exploited?

CVE-2026-6855 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6855 affect?

CVE-2026-6855 affects instructlab, enterprise linux ai. Severity is high (CVSS 7.1). A 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 arbit

How urgent is CVE-2026-6855?

Priority 31/100. High severity; On your watchlist

Related CVEs

CVE-2026-6859 HIGH 8.8 MITIGATE MITIGATE A flaw was found in InstructLab

References

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