Exploited vulnerability · CISA KEV

Is CVE-2026-59822 exploited? Yes: in CISA KEV since 2 Sep 2026

Gociux · BerriAI LiteLLM · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-59822, BerriAI LiteLLM Improper Authentication Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Sep 2026, 56 days after it was published. It affects BerriAI LiteLLM. If you run it, CISA's required action is: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

What it is

BerriAI LiteLLM contains an improper authentication vulnerability in the MCP Streamable HTTP endpoint that could allow an unauthenticated attacker to establish an authenticated MCP session using an arbitrary Bearer token.

What to do

1. Check whether you run it. Look for LiteLLM in your asset inventory, including appliances and cloud images. Stack check lists every exploited BerriAI CVE at once.
2. Apply the fix. Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 8 Jul 2026.
4. Get told next time. Email alerts when CISA adds a CVE for BerriAI.

Other exploited CVEs in LiteLLM

• CVE-2026-42271: BerriAI LiteLLM Command Injection Vulnerability (8 Jun 2026)
• CVE-2026-42208: BerriAI LiteLLM SQL Injection Vulnerability (8 May 2026)

References

• github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
• nvd.nist.gov/vuln/detail/CVE-2026-59822

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in September 2026 · BerriAI scorecard · act-now radar.