How severe is CVE-2026-31949?

CVE-2026-31949 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-31949 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-31949?

CVE-2026-31949 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-31949?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-31949 have an EU (EUVD) identifier?

Yes. CVE-2026-31949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12093.

When was CVE-2026-31949 published?

CVE-2026-31949 was published on 2026-03-13 and last updated on 2026-06-17.

CVE-2026-31949

CVE-2026-31949 is a medium-severity vulnerability in Librechat with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-248.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12093
Weakness: CWE-248
Affected product: Librechat
Published: 2026-03-13
Last modified: 2026-06-17

Description

LibreChat is a ChatGPT clone with additional features. Prior to 0.8.3-rc1, a Denial of Service (DoS) vulnerability exists in the DELETE /api/convos endpoint that allows an authenticated attacker to crash the Node.js server process by sending malformed requests. The DELETE /api/convos route handler attempts to destructure req.body.arg without validating that it exists. The server crashes due to an unhandled TypeError that bypasses Express error handling middleware and triggers process.exit(1). This vulnerability is fixed in 0.8.3-rc1.

Frequently asked questions

What is CVE-2026-31949?: LibreChat is a ChatGPT clone with additional features. Prior to 0.8.3-rc1, a Denial of Service (DoS) vulnerability exists in the DELETE /api/convos endpoint that allows an authenticated attacker to crash the Node.js server process by sending malformed requests. The DELETE /api/convos route handler attempts to destructure req.body.arg without validating that it exists. The server crashes due to an unhandled TypeError that bypasses Express error handling middleware and triggers process.exit(1). This vulnerability is fixed in 0.8.3-rc1.
How severe is CVE-2026-31949?: CVE-2026-31949 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-31949 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-31949?: CVE-2026-31949 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-31949?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-31949 have an EU (EUVD) identifier?: Yes. CVE-2026-31949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12093.
When was CVE-2026-31949 published?: CVE-2026-31949 was published on 2026-03-13 and last updated on 2026-06-17.

References

https://github.com/danny-avila/LibreChat/security/advisories/GHSA-5m32-chq6-232p

Affected products (1)

cpe:2.3:a:librechat:librechat:*:*:*:*:*:*:*:*

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