CVE-2026-90790

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreHIGH confidence

Score 6.3 from GitHub Security Advisory published 2026-09-14. a secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.3Exploit: None knownExposed: 0

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

A security vulnerability has been detected in a2aproject a2a-python up to 1.1.3. This affects the function _dispatch_notification of the file src/a2a/server/tasks/base_push_notification_sender.py of the component Push Notification Sender. The manipulation of the argument push_info.url leads to server-side request forgery. Remote exploitation of the attack is possible. Upgrading to version 1.1.4 is able to mitigate this issue. It is suggested to upgrade the affected component.

CVSS v3
6.3
EG Score
6.3(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity63% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 15, 2026

Advisory Details (4)

Auto-updated Sep 14, 2026
Patch available. Sources: github_pr, github_release.
generic

GitHub - a2aproject/a2a-python: Official Python SDK for the Agent2Agent (A2A) Protocol · GitHub

https://github.com/a2aproject/a2a-python/
github_release Patch Available

v1.1.4

Patch available: a2aproject/a2a-python v1.1.4

https://github.com/a2aproject/a2a-python/releases/tag/v1.1.4
github_pr

fix: validate push notification URLs before dispatch

Upstream fix in progress (PR #1169 · a2aproject/a2a-python, state=closed)

https://github.com/a2aproject/a2a-python/pull/1169
github_pr Patch Available

fix(server): validate push-notification URLs before dispatch (SSRF hardening)

Patch available: a2aproject/a2a-python v1.1.4 (PR #1164 merged 2026-09-03)

https://github.com/a2aproject/a2a-python/pull/1164

Vendor Advisories for CVE-2026-90790(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 24× 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. 2026-09-20 22:20 UTCEG score recompute
  2. 2026-09-20 22:20 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-19 21:32 UTCEG score recompute
  5. 2026-09-19 21:32 UTCGHSA enrichment
  6. 2026-09-18 20:45 UTCEG score recompute
  7. 2026-09-18 20:45 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-17 19:33 UTCEG score recompute
  10. 2026-09-17 19:33 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-16 15:34 UTCEG score recompute
  13. 2026-09-16 15:34 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 14:35 UTCEG score recompute
  17. 2026-09-15 14:35 UTCGHSA enrichment
  18. 2026-09-15 14:03 UTCEG score recompute
  19. 2026-09-15 14:03 UTCGHSA enrichment
  20. 2026-09-14 21:03 UTCEG score recompute
  21. 2026-09-14 21:03 UTCGHSA enrichment
  22. 2026-09-14 15:21 UTCEG score recompute
  23. 2026-09-14 14:40 UTCEG score recompute
  24. 2026-09-14 14:39 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-90790?
CVE-2026-90790 is a medium vulnerability published on September 14, 2026. A security vulnerability has been detected in a2aproject a2a-python up to 1.1.3. This affects the function dispatchnotification of the file src/a2a/server/tasks/basepushnotificationsender.py of the component Push Notification Sender. The manipulation of the argument pushinfo.url leads to…
When was CVE-2026-90790 disclosed?
CVE-2026-90790 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-90790 actively exploited?
CVE-2026-90790 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 87.9% of all scored CVEs.
What is the CVSS score of CVE-2026-90790?
CVE-2026-90790 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-90790?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-90790, 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

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