Authenticated service interruption via unbounded regex evaluation
Published Aug 26, 2026 · Updated Aug 27, 2026
Regular expression denial of service in Weblate before 2026.7 allows remote authenticated users to stall requests through source flags. RegexCheck and PlaceholderCheck execute stored regex quality checks and placeholders against translation content without a timeout, and a flag change repeats those checks across linked target units. The built-in Edit source role is required; catastrophic backtracking can hold CPU indefinitely and sustain request-level service interruption.
Summary
What happened
Regular expression denial of service in Weblate before 2026.7 allows remote authenticated users to stall requests through source flags. RegexCheck and PlaceholderCheck execute stored regex quality checks and placeholders against translation content without a timeout, and a flag change repeats those checks across linked target units. The built-in Edit source role is required; catastrophic backtracking can hold CPU indefinitely and sustain request-level service interruption.
The record
- CVE
- CVE-2026-62326
- Published
- Aug 26, 2026
- Updated
- Aug 27, 2026
- Vendor
- Weblate
- Product
- Weblate
- Classifications
- CWE-400, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 26, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 2026.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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