CVE-2026-90790

a2aproject a2a-python Push Notification Sender base_push_notification_sender.py _dispatch_notification server-side request forgery

State: Published
Severity: 5.3 Medium
Published: Sep 14, 2026
Updated: Sep 15, 2026
Reserved: Sep 13, 2026

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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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X	VulDB
3.1	6.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C	VulDB
3.0	6.3 Medium	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C	VulDB
2.0	6.5 Medium	AV:N/AC:L/Au:S/C:P/I:P/A:P/E:ND/RL:OF/RC:C	VulDB

Weaknesses

CWE-918 Server-Side Request Forgery

Affected Products

Product	Versions
a2a-pythona2aproject	1.1.0Affected 1.1.1Affected 1.1.2Affected 1.1.3Affected 1.1.4Not affected

References

VDB-403296 | a2aproject a2a-python Push Notification Sender base_push_notification_sender.py _dispatch_notification server-side request forgeryvdb-entrytechnical-description
VDB-403296 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-90790 | CVE Analysis and Reportthird-party-advisory
Submit #919747 | a2aproject a2a-python v1.1.2 ssrfthird-party-advisory
https://github.com/a2aproject/a2a-python/pull/1164issue-trackingpatch
https://github.com/a2aproject/a2a-python/pull/1169issue-trackingpatch
https://github.com/a2aproject/a2a-python/releases/tag/v1.1.4patch
https://github.com/a2aproject/a2a-python/product

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