CVE-2026-90790 Details
Description
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.
A server-side request forgery (SSRF) vulnerability has been identified in the a2aproject a2a-python library, affecting versions through 1.1.3. The issue arises in the Push Notification Sender component, specifically within the _dispatch_notification function of base_push_notification_sender.py. The vulnerability allows remote exploitation by manipulating the push_info.url argument. This issue has been addressed in version 1.1.4.
Users are advised to upgrade to a2a-python version 1.1.4, which addresses the vulnerability by validating push notification URLs before dispatching them.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/a2aproject/a2a-python/ | [email protected] | Vendor |
| https://github.com/a2aproject/a2a-python/pull/1164 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-python/pull/1169 | [email protected] | Issue TrackingVendor |
| https://github.com/a2aproject/a2a-python/releases/tag/v1.1.4 | [email protected] | Release NotesVendor |
| https://vuldb.com/cve/CVE-2026-90790 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/919747 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/403296 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/403296/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| a2aproject a2a-python | <= 1.1.3 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |