CVE-2026-31943 is a Server-Side Request Forgery (SSRF) vulnerability in LibreChat, a ChatGPT clone, affecting versions prior to 0.8.3. The flaw in `isPrivateIP()` allows authenticated users to bypass SSRF protection by using hex-normalized IPv4-mapped IPv6 addresses. Rated High with a CVSS score of 8.5, this vulnerability (CWE-918) has a network attack vector and low attack complexity, enabling attackers to make the server issue HTTP requests to internal network resources, including cloud metadata services and RFC1918 ranges, potentially leading to sensitive information disclosure. While there is no evidence of active exploitation or publicly available exploit code, the vulnerability has garnered some community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 0.8.3CPE matchmatch criteria | cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:* | ||
0.8.3CPE matchmatch criteria | cpe:2.3:a:librechat:librechat:0.8.3:rc1:*:*:*:*:*:* | ||
0.8.3CPE matchmatch criteria | cpe:2.3:a:librechat:librechat:0.8.3:rc2:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.