CVE-2026-44661

MEDIUMNVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.7 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. 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, nvd
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

python-utcp is the python implementation of UTCP. Prior to 1.1.3, the utcp-http plugin is vulnerable to a blind Server-Side Request Forgery (SSRF) caused by a trust-boundary inconsistency between manual discovery and tool invocation. register_manual() validates the discovery URL against an HTTPS / loopback allowlist, but call_tool() and call_tool_streaming() reuse the resolved tool_call_template.url directly without revalidating, and the OpenAPI converter blindly trusts whatever servers[0].url an attacker-hosted spec declares. An attacker who hosts a malicious OpenAPI spec on a legitimate HTTPS endpoint can declare e.g. servers: [{ url: "http://127.0.0.1:9090" }] or servers: [{ url: "http://169.254.169.254" }]; the OpenAPI converter then produces tools whose URL points at internal services on the agent host. All three HTTP-class protocols (utcp_http.http, utcp_http.streamable_http, utcp_http.sse) shared the same gap. This vulnerability is fixed in 1.1.3.

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
21(Track)
EG Risk 21/100SSVC: Track

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
Severity47% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

May 14, 2026

Last Modified

May 15, 2026

Advisory Details (1)

Auto-updated Jun 17, 2026
Patch available. Sources: github.
github Patch Available

SSRF via attacker-controlled OpenAPI servers[0].url in HTTP communication protocol · Advisory · universal-tool-calling-protocol/python-utcp · GitHub

Affected: 1.1.2.

https://github.com/universal-tool-calling-protocol/python-utcp/security/advisories/GHSA-39j6-4867-gg4w

Vendor Advisories for CVE-2026-44661(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 rangeFixed inDependents
utcp-http1.0.0 ... 1.1.1 (8 versions)1.1.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 33× 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 126 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-44661?
CVE-2026-44661 is a medium vulnerability published on May 14, 2026. python-utcp is the python implementation of UTCP. Prior to 1.1.3, the utcp-http plugin is vulnerable to a blind Server-Side Request Forgery (SSRF) caused by a trust-boundary inconsistency between manual discovery and tool invocation. registermanual() validates the discovery URL against an HTTPS /…
When was CVE-2026-44661 disclosed?
CVE-2026-44661 was first published in the National Vulnerability Database on May 14, 2026, with the most recent update on May 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44661 actively exploited?
CVE-2026-44661 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.6% of all scored CVEs.
What is the CVSS score of CVE-2026-44661?
CVE-2026-44661 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-44661?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44661, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44661

Explore →

Is Your Infrastructure Affected by CVE-2026-44661?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs