CVE-2026-62326: Weblateorg Weblate

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 products

• Weblateorg Weblate: before 2026.7 (fixed in 2026.7)

Published 2026-08-26. Last modified 2026-09-09.