Known exploited vulnerability
CVE-2026-42208
The short answer
CVE-2026-42208 affects BerriAI litellm and is rated critical (CVSS 9.3). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-05-08: attackers are using it, so patch it first. Fixed versions are published for litellm (1.83.7).
What it is
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.
Weakness: CWE-89.
Severity
9.3 critical
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Yes, since May 8, 2026
Federal due date May 11, 2026
EPSS, next 30 days
89%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- None
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected packages and fixed versions
| Package | Ecosystem | Fixed in | Advisory |
|---|---|---|---|
| litellm | PyPI | 1.83.7 | GHSA-r75f-5x8p-qvmc |
Is it in your code? Drop your lockfile into the free vulnerability check, or let vulnerability watch check your repository every day and open the upgrade as a pull request.
Affected products
litellm, Lightspeed Core, Red Hat Ansible Automation Platform 2, Red Hat OpenShift AI (RHOAI). NVD's record lists the exact affected versions.
References
- github.com/BerriAI/litellm/releases/tag/v1.83.7-stable ProductRelease Notes
- github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc MitigationPatchVendor Advisory
- access.redhat.com/security/cve/CVE-2026-42208 Third Party Advisory
- bugzilla.redhat.com/show_bug.cgi?id=2463965 MitigationThird Party Advisory
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42208.json Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42208 US Government Resource
Questions
Is CVE-2026-42208 being exploited?
Yes. CISA added CVE-2026-42208 to its Known Exploited Vulnerabilities catalog on 2026-05-08, with a federal remediation due date of 2026-05-11.
How do I fix CVE-2026-42208?
Upgrade to a fixed version: litellm (PyPI) 1.83.7. CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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