What is CVE-2026-116877?

CVE-2026-116877 is a medium-severity vulnerability in Semanticmediawiki, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-10-27.

How severe is CVE-2026-116877?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Semanticmediawiki

CVE-2026-116877

Semantic MediaWiki from 2.5.0 before 7.3.1 contains an uncontrolled resource consumption vulnerability that allows low-privilege editors to bypass smwgMaxNumRecurringEvents by supplying a large limit parameter. Attackers can save pages using #set_recurring_event without an end date to generate thousands or millions of date subobjects, exhausting CPU, memory, and database resources.

Published 2026-10-27 · last modified 2026-10-27.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Semanticmediawiki

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-vxrm-2g… (vendor-advisory)
github.com/SemanticMediaWiki/SemanticMediaWiki/commit/215599f0fc03274fd4cee9ba0… (patch)
www.vulncheck.com/advisories/semantic-mediawiki-2.5.0-before-7.3.1-resource-exh… (third-party-advisory)

Frequently asked questions

What is CVE-2026-116877?: CVE-2026-116877 is a medium-severity vulnerability in Semanticmediawiki, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-10-27.
How severe is CVE-2026-116877?: Medium severity. CVSS v3 base score is 6.5 out of 10.