EUVD-2026-40160
GHSA-4rjg-9qq9-25m8
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable, no authentication needed, no complexity; impact is limited to low availability via API resource exhaustion, no confidentiality or integrity loss.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
1DescriptionCVE.org
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.
AnalysisAI
IP spoofing in LibreTranslate through 1.9.7 allows unauthenticated remote attackers to bypass per-IP rate limiting and flood bans by injecting arbitrary values into the X-Forwarded-For HTTP header. The get_remote_address() function accepts client-supplied header values without validating that the request originated from a trusted proxy, enabling any attacker to present a rotating set of forged IP addresses and evade API abuse controls entirely. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions are required beyond network access to the LibreTranslate HTTP API endpoint - exploitation applies against default configurations of LibreTranslate through 1.9.7 where rate limiting is enabled (the feature this vulnerability bypasses). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 (Medium) with vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L reflects low availability impact on the vulnerable system and no confidentiality or integrity impact, which is an accurate characterization of the practical blast radius. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker wishing to abuse the LibreTranslate translation API beyond its rate limits sends a high volume of HTTP translation requests, each carrying a different forged IP address in the X-Forwarded-For header (e.g., X-Forwarded-For: 10.0.0.1, then 10.0.0.2, etc.). Because get_remote_address() returns the attacker-controlled value without trusted-proxy validation, each request appears to originate from a distinct IP, and the per-IP rate limiter never increments a counter for the attacker's real address. … |
| Remediation | Upstream fix available via commit 397fd22 (https://github.com/LibreTranslate/LibreTranslate/commit/397fd224080515d4001a1bc60c8fed53e3c56b6f); a patched tagged release version has not been independently confirmed from available data - operators should pull the latest commit from the main branch or monitor the GitHub repository for a formal release. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-348 – Use of Less Trusted Source
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today