CVE-2026-57942

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.

CVSS 4.0

6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

CVSS 3.1

5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 20% of CVEs (scores of 2026-10-25)

CWE

CWE-348

Published

2026-06-29

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

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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