CVE-2026-31943 Vulnerability Analysis & Exploit Details

CVE-2026-31943
Vulnerability Scoring

8.5
/10
Severe Risk

Cybersecurity professionals consider CVE-2026-31943 an immediate threat requiring urgent mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Changed
    Successful exploitation can impact components beyond the vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-31943 Details

Status: Modified

Last updated: 🕗 31 Mar 2026, 20:16 UTC
Originally published on: 🕗 27 Mar 2026, 20:16 UTC

Time between publication and last update: 3 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVE-2026-31943 Vulnerability Summary

CVE-2026-31943: 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.

Assessing the Risk of CVE-2026-31943

Access Complexity Graph

The exploitability of CVE-2026-31943 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-31943

CVE-2026-31943 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-31943, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-31943, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-31943 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: Low
    Exploiting CVE-2026-31943 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-31943 does not impact system availability.

CVE-2026-31943 References

External References

CWE Common Weakness Enumeration

CWE-918

CAPEC Common Attack Pattern Enumeration and Classification

  • Server Side Request Forgery CAPEC-664 An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

Vulnerable Configurations

  • cpe:2.3:a:librechat:librechat:-:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:-:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.5:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.5:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.0.6:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.0.6:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.5:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.7:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.4.8:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.4.8:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.2:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.2:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.3:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.3:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.4:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.4:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.5:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.5:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.6:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.6:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.7:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.7:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.8:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.8:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.5.9:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.5.9:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.6:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.6:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.9:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.9:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.6.10:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.6.10:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.3:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.3:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.3:rc:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.3:rc:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.3:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.3:rc2:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.4:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.4:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.4:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.4:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.5:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.5:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.5:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.5:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.5:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.5:rc2:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.6:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.6:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.6:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.6:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.7:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.7:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.7:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.7:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.8:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.8:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.8:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.8:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.9:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.9:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.7.9:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.7.9:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.0:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.0:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.1:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.1:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.1:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.1:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.1:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.1:rc2:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.2:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.2:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.3:rc1:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.3:rc1:*:*:*:*:*:*
  • cpe:2.3:a:librechat:librechat:0.8.3:rc2:*:*:*:*:*:*
    cpe:2.3:a:librechat:librechat:0.8.3:rc2:*:*:*:*:*:*

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