How severe is CVE-2026-12771?

CVE-2026-12771 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-12771 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-12771?

CVE-2026-12771 affects Litellm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-12771?

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

Does CVE-2026-12771 have an EU (EUVD) identifier?

Yes. CVE-2026-12771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38137.

When was CVE-2026-12771 published?

CVE-2026-12771 was published on 2026-06-21 and last updated on 2026-06-24.

CVE-2026-12771

CVE-2026-12771 is a medium-severity vulnerability in Litellm with a CVSS 3.x base score of 5.0. 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-266.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
CVSS v2: 4.6
CVSS v4: 1.3
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38137
Weakness: CWE-266
Affected product: Litellm
Published: 2026-06-21
Last modified: 2026-06-24

Description

A vulnerability was identified in BerriAI litellm up to 1.82.2. This affects an unknown function of the file litellm/proxy/auth/user_api_key_auth.py of the component M2M JWT Handler. Such manipulation leads to improper authorization. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.

Frequently asked questions

What is CVE-2026-12771?: A vulnerability was identified in BerriAI litellm up to 1.82.2. This affects an unknown function of the file litellm/proxy/auth/user_api_key_auth.py of the component M2M JWT Handler. Such manipulation leads to improper authorization. The attack can be launched remotely. A high complexity level is associated with this attack. The exploitability is reported as difficult. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure.
How severe is CVE-2026-12771?: CVE-2026-12771 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-12771 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-12771?: CVE-2026-12771 affects Litellm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-12771?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-12771 have an EU (EUVD) identifier?: Yes. CVE-2026-12771 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38137.
When was CVE-2026-12771 published?: CVE-2026-12771 was published on 2026-06-21 and last updated on 2026-06-24.

References

Affected products (1)

cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*

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