SSRF in A2aproject A2a-Python
CVE-2026-90790
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- A2aproject A2a-Python — versions 1.1.0, 1.1.1, 1.1.2
Weakness classification (CWE)
References
- vuldb.com/vuln/403296 (technical-description, vdb-entry)
- vuldb.com/vuln/403296/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90790 (third-party-advisory)
- vuldb.com/submit/919747 (third-party-advisory)
- github.com/a2aproject/a2a-python/pull/1164 (issue-tracking, patch)
- github.com/a2aproject/a2a-python/pull/1169 (issue-tracking, patch)
- github.com/a2aproject/a2a-python/releases/tag/v1.1.4 (patch)
- github.com/a2aproject/a2a-python/ (product)
Frequently asked questions
- What is CVE-2026-90790?
- CVE-2026-90790 is a medium-severity vulnerability in A2aproject A2a-Python, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.3/10. Published 2026-09-14.
- How severe is CVE-2026-90790?
- Medium severity. CVSS v3 base score is 6.3 out of 10.