CVE-2026-55529

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.9Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream _validate_origin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit tools/call requests to the local MCP server and execute exposed tools. This issue is fixed in version 4.6.58.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100CISA 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
Severity69% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (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

August 25, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

PraisonAI v4.6.58

Patch available: MervinPraison/PraisonAI v4.6.58

https://github.com/MervinPraison/PraisonAI/releases/tag/v4.6.58
github_commit Patch Available

commit 2f9677abb2ea (MervinPraison/PraisonAI)

Patch available: MervinPraison/PraisonAI v4.6.137 (contains commit 2f9677abb2ea)

https://github.com/MervinPraison/PraisonAI/commit/2f9677abb2ea68eab864ee8b6a828fd0141612e1
githubMentions a patch (unverified)🟡 PoC Available

Origin validation bypass in MCP HTTP Stream transport allows browser-mediated unauthenticated tool execution on local MCP server · Advisory · MervinPraison/PraisonAI · GitHub

https://github.com/MervinPraison/PraisonAI/security/advisories/GHSA-wj6g-v78p-6fx3

Vendor Advisories for CVE-2026-55529(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
praisonai0.0.1 ... 4.6.9 (748 versions)
  • every version up to 4.6.58: fixed in 4.6.58
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 51× 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.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-10 12:06 UTCEG score recompute
  3. 2026-10-09 20:07 UTCEPSS rescore
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  21. 2026-09-30 15:03 UTCEPSS rescore
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  25. 2026-09-28 13:51 UTCEPSS rescore
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  1. 2026-09-27 21:31 UTCEG score recompute
  2. 2026-09-27 13:48 UTCEPSS rescore
  3. 2026-09-26 22:06 UTCEG score recompute
  4. 2026-09-26 15:59 UTCEPSS rescore
  5. 2026-09-24 19:24 UTCEG score recompute
  6. 2026-09-24 14:04 UTCEPSS rescore
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  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-22 19:22 UTCEG score recompute
  10. 2026-09-20 20:26 UTCEG score recompute
  11. 2026-09-20 20:16 UTCEPSS rescore
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  20. 2026-09-15 18:44 UTCEG score recompute
  21. 2026-09-15 03:11 UTCEPSS rescore
  22. 2026-09-13 18:59 UTCEG score recompute
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-12 19:36 UTCEG score recompute
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  26. 2026-09-11 14:53 UTCEPSS rescore
  27. 2026-09-10 20:39 UTCEG score recompute
  28. 2026-09-10 09:35 UTCEPSS rescore
  29. 2026-09-09 01:15 UTCEG score recompute
  30. 2026-09-08 22:01 UTCEPSS rescore
  31. 2026-09-07 16:01 UTCEPSS rescore
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  33. 2026-09-06 13:47 UTCEPSS rescore
  34. 2026-09-04 15:35 UTCEG score recompute
  35. 2026-09-04 05:06 UTCEPSS rescore
  36. 2026-09-01 17:07 UTCEG score recompute
  37. 2026-09-01 13:54 UTCEPSS rescore
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-08-31 17:39 UTCEG score recompute
  40. 2026-08-30 19:17 UTCEPSS rescore
  41. 2026-08-30 16:53 UTCEG score recompute
  42. 2026-08-30 01:22 UTCEPSS rescore
  43. 2026-08-29 17:30 UTCEG score recompute
  44. 2026-08-28 21:41 UTCEPSS rescore
  45. 2026-08-27 17:36 UTCEG score recompute
  46. 2026-08-27 17:14 UTCEG score recompute
  47. 2026-08-27 14:25 UTCEPSS rescore
  48. 2026-08-27 14:09 UTCEG score recompute
  49. 2026-08-26 14:46 UTCEPSS rescore
  50. 2026-08-25 15:21 UTCEG score recompute
  51. 2026-08-25 14:35 UTCEG score recompute
  52. 2026-08-25 14:34 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55529?
CVE-2026-55529 is a medium vulnerability published on August 25, 2026. PraisonAI is a multi-agent teams system. Prior to praisonai 4.6.58, the MCP HTTP Stream validateorigin method accepts request_origin.startswith(allowed), so the attacker-controlled localhost.evil.example HTTP origin matches the localhost allowlist. Without an API key, a malicious webpage can submit…
When was CVE-2026-55529 disclosed?
CVE-2026-55529 was first published on August 25, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55529 actively exploited?
CVE-2026-55529 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55529?
CVE-2026-55529 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55529?
A fix for CVE-2026-55529 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55529 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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