CVE-2026-62326

Summary

Weblate is a web-based continuous localization platform used to manage software translations. In versions prior to 2026.7, a user with the built-in "Edit source" role can store a malicious regular expression in a source string's flags that is executed without any timeout, allowing them to stall requests and deny service. Regular expressions supplied through the regex: quality check and regex placeholders are compiled during validation but later run against translation content in RegexCheck and PlaceholderCheck with no time limit, so a catastrophic-backtracking pattern like ^(a|aa)+$ can consume CPU indefinitely. Because Weblate re-runs these checks for every linked target unit in the same request when a source unit's flags change, a single edit can trigger sustained CPU-bound denial of service. This issue is fixed in version 2026.7.

Affected Software

Weaknesses

• CWE-400: CWE-400: Uncontrolled Resource Consumption

References

• https://github.com/WeblateOrg/weblate/security/advisories/GHSA-r52j-4vjp-q949
• https://github.com/WeblateOrg/weblate/commit/8fd8431414bec5c86dbc94815319fc474518286a

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