Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck

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

Medium 5.3

In plain English

A medium-severity security flaw in LibreTranslate from LibreTranslate. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 85.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
LibreTranslate	LibreTranslate	0 – through 1.9.7

Weakness: CWE-348 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Researcher Disclosure issue-tracking
Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/libretranslate-ip-spoofing-via-x-forwarded-for-header third-party-advisory