CVE-2026-63133 Malcolm has Uncontrolled Resource Consumption in Archive Extraction (Inode-Exhaustion DoS)
Attackers can cause denial of service in Malcolm by uploading malicious archives that exhaust filesystem inodes during extraction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63133?
CVE-2026-63133 is a high-severity denial of service vulnerability in cisagov Malcolm, published on 11 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Malcolm is a network traffic analysis tool suite. Prior to version 26.07.0, `safe-extract.py` extracts uploaded archives with no limit on entry count, directory depth, total entries, or output size. A small malicious archive containing a large number of directory or file entries causes the filebeat processing container to create an unbounded number of filesystem objects, exhausting inodes or filesystem metadata and denying service to the processing pipeline and any service sharing the same mount. Version 26.07.0 fixes the issue.
Weakness: CWE-770
Which versions are affected by CVE-2026-63133?
How do I fix CVE-2026-63133?
No fix has been published for CVE-2026-63133 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-63133 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-63133 exists.
Sources
Also known as GHSA-c35g-mgc3-95rx.