CVE-2026-34089 Memory leak in Scribunto causes runJobs.php to run out of memory
A memory leak in Scribunto causes runJobs.php to exhaust memory, leading to denial of service for MediaWiki installations.
- 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-2026-34089?
CVE-2026-34089 is a low-severity denial of service vulnerability in Wikimedia Foundation Scribunto, published on 11 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Vulnerability in Wikimedia Foundation Scribunto.
This issue affects Scribunto: from 1.45.0 before 1.45.2.
Which versions are affected by CVE-2026-34089?
It affects 1 product.
Products include Wikimedia Scribunto.
How do I fix CVE-2026-34089?
No fix has been published for CVE-2026-34089 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-2026-34089 being exploited?
There is no known exploitation of CVE-2026-34089 in the wild and no public exploit code.
Sources
Also known as GHSA-mcf6-vhp9-g7jr, UBUNTU-CVE-2026-34089.