What’s Vulnerable › Vulnerabilities

CVE-2026-57942: LibreTranslate - IP Spoofing via X-Forwarded-For Header

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-29 · updated 2026-10-25
• Weakness: CWE-348

Description

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.

Affected products

• LibreTranslate: through 1.9.7

References

• https://github.com/LibreTranslate/LibreTranslate/commit/397fd224080515d4001a1bc60c8fed53e3c56b6f
• https://github.com/LibreTranslate/LibreTranslate/issues/986
• https://github.com/LibreTranslate/LibreTranslate/pull/987
• https://www.vulncheck.com/advisories/libretranslate-ip-spoofing-via-x-forwarded-for-header
• https://github.com/LibreTranslate/LibreTranslate/issues/986

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