How severe is CVE-2025-8849?

CVE-2025-8849 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-8849 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-8849?

CVE-2025-8849 affects Librechat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-8849?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-8849 have an EU (EUVD) identifier?

Yes. CVE-2025-8849 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37228.

When was CVE-2025-8849 published?

CVE-2025-8849 was published on 2025-10-31 and last updated on 2026-06-17.

CVE-2025-8849

CVE-2025-8849 is a high-severity vulnerability in Librechat with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37228
Weakness: CWE-400
Affected product: Librechat
Published: 2025-10-31
Last modified: 2026-06-17

Description

LibreChat version 0.7.9 is vulnerable to a Denial of Service (DoS) attack due to unbounded parameter values in the `/api/memories` endpoint. The `key` and `value` parameters accept arbitrarily large inputs without proper validation, leading to a null pointer error in the Rust-based backend when excessively large values are submitted. This results in the inability to create new memories, impacting the stability of the service.

Frequently asked questions

What is CVE-2025-8849?: LibreChat version 0.7.9 is vulnerable to a Denial of Service (DoS) attack due to unbounded parameter values in the `/api/memories` endpoint. The `key` and `value` parameters accept arbitrarily large inputs without proper validation, leading to a null pointer error in the Rust-based backend when excessively large values are submitted. This results in the inability to create new memories, impacting the stability of the service.
How severe is CVE-2025-8849?: CVE-2025-8849 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-8849 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-8849?: CVE-2025-8849 affects Librechat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-8849?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-8849 have an EU (EUVD) identifier?: Yes. CVE-2025-8849 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37228.
When was CVE-2025-8849 published?: CVE-2025-8849 was published on 2025-10-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:librechat:librechat:0.7.9:-:*:*:*:*:*:*

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