CVE-2026-31943

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Source
https://cve.org/CVERecord?id=CVE-2026-31943
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31943.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-31943
Aliases
  • GHSA-w5r7-4f94-vp4c
Published
2026-03-27T19:21:50.653Z
Modified
2026-04-10T05:42:12.265255Z
Severity
  • 8.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N CVSS Calculator
Summary
LibreChat has SSRF protection bypass via IPv4-mapped IPv6 normalization in isPrivateIP
Details

LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, isPrivateIP() in packages/api/src/auth/domain.ts fails to detect IPv4-mapped IPv6 addresses in their hex-normalized form, allowing any authenticated user to bypass SSRF protection and make the server issue HTTP requests to internal network resources — including cloud metadata services (e.g., AWS 169.254.169.254), loopback, and RFC1918 ranges. Version 0.8.3 fixes the issue.

Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31943.json"
}
References

Affected packages

Git / github.com/danny-avila/librechat

Affected ranges

Type
GIT
Repo
https://github.com/danny-avila/librechat
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
cfbe812d63451c1578faa9a13b7e77e0c9a9789b
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.8.3"
        }
    ]
}

Affected versions

chart-1.*
chart-1.9.0
chart-1.9.1
chart-1.9.2
chart-1.9.3
chart-1.9.4
chart-1.9.5
chart-1.9.6
chart-1.9.7
chart-1.9.8
chart-1.9.9
librechat-1.*
librechat-1.8.9
v0.*
v0.0.1
v0.0.2
v0.0.3
v0.0.6
v0.1.0
v0.1.1
v0.2.0
v0.3.0
v0.3.3
v0.4.0
v0.4.1
v0.4.2
v0.4.3
v0.4.4
v0.4.5
v0.4.6
v0.4.7
v0.4.8
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.5.5
v0.5.6
v0.5.7
v0.5.8
v0.5.9
v0.6.0
v0.6.1
v0.6.10
v0.6.5
v0.6.6
v0.6.9
v0.7.0
v0.7.1
v0.7.2
v0.7.3
v0.7.3-rc
v0.7.3-rc2
v0.7.4
v0.7.4-rc1
v0.7.5
v0.7.5-rc1
v0.7.5-rc2
v0.7.6
v0.7.6-rc1
v0.7.7
v0.7.7-rc1
v0.7.8
v0.7.8-rc1
v0.7.9
v0.7.9-rc1
v0.8.0
v0.8.0-rc1
v0.8.0-rc2
v0.8.0-rc3
v0.8.0-rc4
v0.8.1
v0.8.1-rc1
v0.8.1-rc2
v0.8.2
v0.8.2-rc1
v0.8.2-rc2
v0.8.2-rc3
v0.8.3-rc1
v0.8.3-rc2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31943.json"