CVE-2026-63134Public exploitNetwork attack vectorHinoki check available

Denial of service via unsafe archive directory creation

Published Aug 11, 2026 · Updated Aug 11, 2026

Path traversal in Malcolm before 26.07.0 allows remote authenticated users to interrupt file processing via a crafted archive. In filebeat/scripts/safe-extract.py, extract_libarchive passes raw directory entry paths to os.makedirs without confining the resolved target to the extraction directory. ROLE_UPLOAD access is sufficient; escaped directories can block expected log-file paths or exhaust inodes and disk metadata, but cannot write files or execute code.

CVSS severity5.4
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in Malcolm before 26.07.0 allows remote authenticated users to interrupt file processing via a crafted archive. In filebeat/scripts/safe-extract.py, extract_libarchive passes raw directory entry paths to os.makedirs without confining the resolved target to the extraction directory. ROLE_UPLOAD access is sufficient; escaped directories can block expected log-file paths or exhaust inodes and disk metadata, but cannot write files or execute code.

The record

CVE
CVE-2026-63134
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Cybersecurity and Infrastructure Security Agency (CISA)
Product
Malcolm
Classifications
CWE-22, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.07.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybersecurity and Infrastructure Security Agency (CISA) · Malcolmversion=< 26.07.0

Published CVSS scores

5.4GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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