CVE-2026-126562 Semantic MediaWiki 3.0.0 before 7.4.1 Uncontrolled Recursion via ElasticStore ConceptDescriptionInterpreter
Users with page-edit rights can create mutually referencing concept pages that exhaust memory or stack in Semantic MediaWiki.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126562?
CVE-2026-126562 is a medium-severity denial of service vulnerability in SemanticMediaWiki, published on 11 Nov 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Semantic MediaWiki 3.0.0 before 7.4.1 contains an uncontrolled recursion vulnerability in the ElasticStore ConceptDescriptionInterpreter that only detects directly self-referencing concepts. Users with page-edit rights can create mutually referencing concept pages, causing concept page views, Special:Ask, or api.php action=ask queries to exhaust PHP memory or stack.
Weakness: CWE-674
Which versions are affected by CVE-2026-126562?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126562?
No fix has been published for CVE-2026-126562 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-2026-126562 being exploited?
There is no known exploitation of CVE-2026-126562 in the wild and no public exploit code.
Sources
Also known as GHSA-cm2r-7rp4-3767, GHSA-jwx8-mm92-gv95.