CVE-2026-59822

CRITICALNVD 8.29.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.2 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Exploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0.8%CVSS: 8.2Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.

CVSS v3
8.2
EG Score
9.0CRITICALhigh confidence
EG Risk
96
EG Risk 96/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low or medium mission impact; Act at high (mission-essential systems).
Action: A fix is available. Apply it sooner than your standard update timelines at low or medium mission impact and as soon as possible at high.
EPSS PROB
0.8%
EPSS %ILE
56th
KEV
⚠ Exploited

CISA SSVCAttend at low or medium mission impact; Act at high (mission-essential systems).

A fix is available. Apply it sooner than your standard update timelines at low or medium mission impact and as soon as possible at high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 8, 2026

Last Modified

September 3, 2026

Advisory Details (4)

Auto-updated Jul 8, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

MCP Authentication Bypass via OAuth2 Passthrough Fallback · Advisory · BerriAI/litellm · GitHub

https://github.com/BerriAI/litellm/security/advisories/GHSA-7488-6r32-c95q
github_release Patch Available

v1.84.0

Patch available: BerriAI/litellm v1.84.0

https://github.com/BerriAI/litellm/releases/tag/v1.84.0
github_pr

fix(mcp): tighten public-route detection and OAuth2 fallback gating

Fix merged in BerriAI/litellm PR #26463 on 2026-04-30 — awaiting tagged release

https://github.com/BerriAI/litellm/pull/26463
github_commit

commit 73869f0faf7d (BerriAI/litellm)

Fix landed in BerriAI/litellm commit 73869f0faf7d — awaiting tagged release

https://github.com/BerriAI/litellm/commit/73869f0faf7d11ee21adcb5f91b8c33a340b6c2c

Vendor Advisories for CVE-2026-59822(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
litellm0.1.0 ... 1.9.dev0 (1119 versions)
  • every version up to 1.84.0: fixed in 1.84.0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 66× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 187 total refreshes for this CVE.

  1. 2026-10-10 21:48 UTCEG score recompute
  2. 2026-10-10 20:00 UTCEPSS rescore
  3. 2026-10-09 20:55 UTCEG score recompute
  4. 2026-10-09 20:07 UTCEPSS rescore
  5. 2026-10-08 20:02 UTCEG score recompute
  6. 2026-10-08 17:13 UTCEPSS rescore
  7. 2026-10-08 03:25 UTCEG score recompute
  8. 2026-10-07 23:48 UTCEPSS rescore
  9. 2026-10-06 18:15 UTCEG score recompute
  10. 2026-10-06 15:18 UTCEPSS rescore
  11. 2026-10-05 21:30 UTCEG score recompute
  12. 2026-10-05 17:43 UTCEPSS rescore
  13. 2026-10-03 15:33 UTCEG score recompute
  14. 2026-10-03 14:26 UTCEPSS rescore
  15. 2026-10-02 18:49 UTCEG score recompute
  16. 2026-10-02 17:56 UTCEPSS rescore
  17. 2026-10-01 22:04 UTCEG score recompute
  18. 2026-10-01 19:50 UTCEPSS rescore
  19. 2026-09-30 16:59 UTCEG score recompute
  20. 2026-09-30 15:03 UTCEPSS rescore
  21. 2026-09-29 16:06 UTCEG score recompute
  22. 2026-09-29 15:22 UTCEPSS rescore
  23. 2026-09-28 23:30 UTCEG score recompute
  24. 2026-09-28 15:11 UTCEG score recompute
  25. 2026-09-28 13:51 UTCEPSS rescore
Show 75 more
  1. 2026-09-27 21:51 UTCCISA KEV update
  2. 2026-09-27 14:18 UTCEG score recompute
  3. 2026-09-27 13:48 UTCEPSS rescore
  4. 2026-09-26 17:33 UTCEG score recompute
  5. 2026-09-26 15:59 UTCEPSS rescore
  6. 2026-09-26 00:56 UTCEG score recompute
  7. 2026-09-25 19:35 UTCCISA KEV update
  8. 2026-09-25 14:55 UTCCISA KEV update
  9. 2026-09-24 19:31 UTCCISA KEV update
  10. 2026-09-24 15:44 UTCEG score recompute
  11. 2026-09-24 14:04 UTCEPSS rescore
  12. 2026-09-23 19:01 UTCEG score recompute
  13. 2026-09-23 17:54 UTCEPSS rescore
  14. 2026-09-22 19:36 UTCCISA KEV update
  15. 2026-09-22 18:05 UTCEG score recompute
  16. 2026-09-21 21:21 UTCEG score recompute
  17. 2026-09-21 19:09 UTCCISA KEV update
  18. 2026-09-20 20:28 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-19 19:37 UTCEG score recompute
  21. 2026-09-18 22:52 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-18 19:20 UTCCISA KEV update
  24. 2026-09-18 14:15 UTCCISA KEV update
  25. 2026-09-17 22:00 UTCEG score recompute
  26. 2026-09-17 19:31 UTCEPSS rescore
  27. 2026-09-16 16:55 UTCEG score recompute
  28. 2026-09-16 14:10 UTCCISA KEV update
  29. 2026-09-16 14:08 UTCEPSS rescore
  30. 2026-09-16 08:38 UTCEG score recompute
  31. 2026-09-16 05:15 UTCEPSS rescore
  32. 2026-09-15 03:36 UTCEG score recompute
  33. 2026-09-15 03:11 UTCEPSS rescore
  34. 2026-09-14 19:24 UTCCISA KEV update
  35. 2026-09-13 18:27 UTCEG score recompute
  36. 2026-09-13 16:47 UTCEPSS rescore
  37. 2026-09-12 17:34 UTCEG score recompute
  38. 2026-09-11 18:49 UTCCISA KEV update
  39. 2026-09-11 16:40 UTCEG score recompute
  40. 2026-09-11 14:53 UTCEPSS rescore
  41. 2026-09-11 12:31 UTCEG score recompute
  42. 2026-09-10 19:28 UTCCISA KEV update
  43. 2026-09-10 11:37 UTCEG score recompute
  44. 2026-09-10 09:35 UTCEPSS rescore
  45. 2026-09-09 19:08 UTCCISA KEV update
  46. 2026-09-08 22:14 UTCEG score recompute
  47. 2026-09-08 22:01 UTCEPSS rescore
  48. 2026-09-08 18:54 UTCCISA KEV update
  49. 2026-09-07 17:02 UTCEG score recompute
  50. 2026-09-07 16:01 UTCEPSS rescore
  51. 2026-09-06 16:06 UTCEG score recompute
  52. 2026-09-06 13:47 UTCEPSS rescore
  53. 2026-09-05 19:19 UTCEG score recompute
  54. 2026-09-04 17:38 UTCCISA KEV update
  55. 2026-09-04 14:13 UTCEG score recompute
  56. 2026-09-04 05:55 UTCEG score recompute
  57. 2026-09-04 05:07 UTCEPSS rescore
  58. 2026-09-02 18:35 UTCEG score recompute
  59. 2026-09-02 17:35 UTCEG score recompute▲ 0.80
  60. 2026-09-02 17:33 UTCCISA KEV update
  61. 2026-09-02 14:12 UTCEPSS rescore
  62. 2026-09-01 13:54 UTCEPSS rescore
  63. 2026-09-01 04:40 UTCEPSS rescore
  64. 2026-08-30 19:17 UTCEPSS rescore
  65. 2026-08-30 07:29 UTCEG score recompute
  66. 2026-08-30 01:22 UTCEPSS rescore
  67. 2026-08-28 23:40 UTCEG score recompute
  68. 2026-08-28 21:42 UTCEPSS rescore
  69. 2026-08-27 21:50 UTCEG score recompute
  70. 2026-08-27 14:25 UTCEPSS rescore
  71. 2026-08-27 01:28 UTCEG score recompute
  72. 2026-08-26 14:46 UTCEPSS rescore
  73. 2026-08-26 08:22 UTCEG score recompute
  74. 2026-08-25 13:49 UTCEPSS rescore
  75. 2026-08-24 20:32 UTCEG score recompute

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Frequently asked(6)

What is CVE-2026-59822?
CVE-2026-59822 is a critical vulnerability published on July 8, 2026. LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key…
When was CVE-2026-59822 disclosed?
CVE-2026-59822 was first published on July 8, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59822 actively exploited?
Yes. CISA added CVE-2026-59822 to the Known Exploited Vulnerabilities catalog on September 2, 2026, affecting BerriAI LiteLLM. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2026-59822?
CVE-2026-59822 has a CVSS v3 base score of 8.2 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2026-59822?
CVE-2026-59822 affects BerriAI LiteLLM. The affected packages EchelonGraph has on record, with version ranges, are listed in the Affected Packages section of this page.
How do I remediate CVE-2026-59822?
A fix for CVE-2026-59822 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59822 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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