CVE-2026-35030: LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format

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CRITICAL 9.1REMOTEUPGRADE

CVE-2026-35030 is a critical-severity flaw (CVSS 9.1) affecting litellm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.83.0, when JWT authentication is enabled (enable_jwt_auth: true), the OIDC userinfo cache uses token[:20] as the cache key. JWT headers produced by the same signing algorithm generate identical first 20 characters. This configuration option is not enabled by default. Most instances are not affected. An unauthenticated attacker can craft a token whose

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-287, CWE-222
Published	2026-04-06
Last modified	2026-10-24

Publisher (CNA): GitHub, Inc. · Vendor: litellm

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 17:17 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

litellm litellm UPGRADE

Affected: < 1.83.0

Fixed in: 1.83.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy litellm || rpm -q litellm || litellm --version

2. UPGRADE to 1.83.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade litellm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade litellm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Python (pip) · litellm · FIXED · 1.83.0 · vulnerable: < 1.83.0 · source

pip install --upgrade "litellm>=1.83.0" pip show litellm

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: learner202649/CVE-2026-35030-PoC (0 stars)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35030?

litellm: upgrade to 1.83.0. Exact commands for each OS are on this page.

Is CVE-2026-35030 being exploited?

CVE-2026-35030 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35030 affect?

CVE-2026-35030 affects litellm. Severity is 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 authentication is enabled (enable_jwt_auth: true), the OIDC userinfo cache uses token[:20] as the cache key. JWT headers produce

How urgent is CVE-2026-35030?

Priority 55/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

OpenAI and LLM tools vulnerabilities

Related CVEs

CVE-2026-35029 HIGH 8.8 UPGRADE LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format
CVE-2026-59822 HIGH 8.2 EXPLOITED UPGRADE BerriAI LiteLLM Improper Authentication Vulnerability

References

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