How severe is CVE-2026-35029?

CVE-2026-35029 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35029 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35029?

CVE-2026-35029 affects Litellm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35029?

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-2026-35029 have an EU (EUVD) identifier?

Yes. CVE-2026-35029 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19370.

When was CVE-2026-35029 published?

CVE-2026-35029 was published on 2026-04-06 and last updated on 2026-06-30.

CVE-2026-35029

CVE-2026-35029 is a high-severity vulnerability in Litellm with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 26% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 26% (98th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19370
Weakness: CWE-863
Affected product: Litellm
Published: 2026-04-06
Last modified: 2026-06-30

Description

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, the /config/update endpoint does not enforce admin role authorization. A user who is already authenticated into the platform can then use this endpoint to modify proxy configuration and environment variables, register custom pass-through endpoint handlers pointing to attacker-controlled Python code, achieving remote code execution, read arbitrary server files by setting UI_LOGO_PATH and fetching via /get_image, and take over other privileged accounts by overwriting UI_USERNAME and UI_PASSWORD environment variables. Fixed in v1.83.0.

Frequently asked questions

What is CVE-2026-35029?: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, the /config/update endpoint does not enforce admin role authorization. A user who is already authenticated into the platform can then use this endpoint to modify proxy configuration and environment variables, register custom pass-through endpoint handlers pointing to attacker-controlled Python code, achieving remote code execution, read arbitrary server files by setting UI_LOGO_PATH and fetching via /get_image, and take over other privileged accounts by overwriting UI_USERNAME and UI_PASSWORD environment variables. Fixed in v1.83.0.
How severe is CVE-2026-35029?: CVE-2026-35029 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35029 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 26% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35029?: CVE-2026-35029 affects Litellm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35029?: 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-2026-35029 have an EU (EUVD) identifier?: Yes. CVE-2026-35029 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19370.
When was CVE-2026-35029 published?: CVE-2026-35029 was published on 2026-04-06 and last updated on 2026-06-30.

References

Affected products (1)

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

More vulnerabilities in Litellm

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CVE-2026-35030 — Critical (CVSS 9.1): LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, when JWT…
CVE-2026-47102 — High (CVSS 8.8): LiteLLM prior to 1.83.10 allows a user to modify their own user_role via the /user/update endpoint. While the endpoint…

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