Rate-limit bypass via untrusted X-Forwarded-For
Published Jun 29, 2026 · Updated Jun 29, 2026
IP spoofing in LibreTranslate 1.9.7 and earlier allows remote attackers to bypass per-IP abuse controls through crafted HTTP headers. get_remote_address() accepts the first X-Forwarded-For value as the client address without requiring an explicitly trusted proxy. Exploitation requires rate limiting or flood protection to be enabled and permits unrestricted translation or detection requests that can exhaust service resources.
Summary
What happened
IP spoofing in LibreTranslate 1.9.7 and earlier allows remote attackers to bypass per-IP abuse controls through crafted HTTP headers. get_remote_address() accepts the first X-Forwarded-For value as the client address without requiring an explicitly trusted proxy. Exploitation requires rate limiting or flood protection to be enabled and permits unrestricted translation or detection requests that can exhaust service resources.
The record
- CVE
- CVE-2026-57942
- Published
- Jun 29, 2026
- Updated
- Jun 29, 2026
- Vendor
- LibreTranslate
- Product
- LibreTranslate
- Classifications
- CWE-348, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 29, 2026CVE publishedPublication date reported by the CVE source.
- Jun 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=1.9.7
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- X-Forwarded-For rate-limit bypass proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo