LibreTranslate up to 1.9.7 X-Forwarded-For get_remote_address less trusted source

Summaryinfo

A vulnerability was found in LibreTranslate up to 1.9.7. It has been rated as problematic. Affected by this issue is the function get_remote_address of the component X-Forwarded-For Handler. Performing a manipulation results in less trusted source. This vulnerability is identified as CVE-2026-57942. The attack can be initiated remotely. There is not any exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as problematic has been found in LibreTranslate up to 1.9.7. This affects the function get_remote_address of the component X-Forwarded-For Handler. The manipulation with an unknown input leads to a less trusted source vulnerability. CWE is classifying the issue as CWE-348. The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. This is going to have an impact on availability. The summary by CVE is:

LibreTranslate through 1.9.7, fixed in commit 397fd22, contains an IP spoofing vulnerability in the get_remote_address() function that allows unauthenticated attackers to spoof client IP addresses by injecting arbitrary values into the X-Forwarded-For header without trusted proxy validation. Attackers can bypass per-IP rate limiting and flood bans by supplying forged addresses in the X-Forwarded-For header to enable unlimited API abuse.

The weakness was released by George Chen as 986. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-57942 since 06/26/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Applying the patch 397fd224080515d4001a1bc60c8fed53e3c56b6f is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-40160). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• LibreTranslate

Version

• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3
• 1.9.4
• 1.9.5
• 1.9.6
• 1.9.7

License

• open-source

Website

• Product: https://github.com/LibreTranslate/LibreTranslate/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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