---
id: CVE-2026-90790
title: >-
  A security vulnerability has been detected in a2aproject a2a-python up to
  1.1.3
summary: >-
  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…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-918
vendor: a2aproject
product: a2a-python
affected:
  - a2a-python 1.1.0
  - a2a-python 1.1.1
  - a2a-python 1.1.2
  - a2a-python 1.1.3
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:17:35.557'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90790'
references:
  - url: 'https://github.com/a2aproject/a2a-python/'
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-python/pull/1164'
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-python/pull/1169'
    label: cna@vuldb.com
  - url: 'https://github.com/a2aproject/a2a-python/releases/tag/v1.1.4'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-90790'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/919747'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403296'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/403296/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T13:33:15.907930Z'
epss: 0.00214
epssPercentile: 0.12098
ingestedAt: '2026-09-14T15:23:07.424Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.