Threat Intelligence / CVE / CVE-2026-42208

CVE-2026-42208 — Litellm

CISA KEVRansomware
CVSS v3.1 9.8 (CRITICAL) · CVSS v4.0 9.3 · EPSS 54.2% (higher than 98.0% of all scored CVEs) · Priority 10/10 · Published 2026-05-08

As of 2026-05-09, CVE-2026-42208 is a CRITICAL-severity vulnerability in Litellm, CVSS v3.1 9.8, EPSS 54.2% (98.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-08), with a US federal remediation deadline of 2026-05-11, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-42208, most recently “BerriAI LiteLLM Unauthenticated SQL Injection in Proxy API Key Verification (CVE-2026-42208) — CVSS 9.8, CISA KEV”.

Last updated: 2026-05-09

What is CVE-2026-42208?

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.81.16 to before version 1.83.7, a database query used during proxy API key checks mixed the caller-supplied key value into the query text instead of passing it as a separate parameter. An unauthenticated attacker could send a specially crafted Authorization header to any LLM API route (for example POST /chat/completions) and reach this query through the proxy's error-handling path. An attacker could read data from the proxy's database and may be able to modify it, leading to unauthorised access to the proxy and the credentials it manages. This issue has been patched in version 1.83.7.

The record classifies CVE-2026-42208 under weakness class CWE-89. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 127 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 base score
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS (FIRST)
54.2% probability of exploitation in the next 30 days, higher than 98.0% of all scored CVEs
CISA KEV
Listed since 2026-05-08, federal remediation deadline 2026-05-11 — used in known ransomware campaigns
Threadlinqs priority
10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
Published
2026-05-08, last modified 2026-05-09

Is CVE-2026-42208 being exploited?

CISA added CVE-2026-42208 to the Known Exploited Vulnerabilities catalog on 2026-05-08, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-05-11 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-42208

The record marks a vendor fix as available for CVE-2026-42208. Patch reference: https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc. Vendor advisory: https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc. Because CVE-2026-42208 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-05-11. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-42208

2 tracked threats in the Threadlinqs corpus reference CVE-2026-42208, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from cveorg and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-42208 are available via the Threadlinqs MCP server (Purple tier). View plans →

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