CVE-2026-90790Network attack vectorHinoki check available

SSRF via unvalidated webhook URL

Published Sep 14, 2026 · Updated Sep 14, 2026

Server-side request forgery in A2A Python SDK 1.1.0 through 1.1.3 allows remote attackers to make server-side requests via push notification URLs. The _dispatch_notification function passes push_info.url directly to the HTTP client without validating schemes, destinations, or private-network addresses. Exploitation requires the attacker to control a push notification configuration and can expose responses from internal services or cloud metadata endpoints.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Server-side request forgery in A2A Python SDK 1.1.0 through 1.1.3 allows remote attackers to make server-side requests via push notification URLs. The _dispatch_notification function passes push_info.url directly to the HTTP client without validating schemes, destinations, or private-network addresses. Exploitation requires the attacker to control a push notification configuration and can expose responses from internal services or cloud metadata endpoints.

The record

CVE
CVE-2026-90790
Published
Sep 14, 2026
Updated
Sep 14, 2026
Vendor
A2A Project
Product
A2A Python SDK
Classifications
Unavailable
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1.0
  2. Affected versionversion=1.1.1
  3. Affected versionversion=1.1.2
  4. Affected versionversion=1.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

A2A Project · A2A Python SDKversion=1.1.0; version=1.1.1; version=1.1.2; version=1.1.3

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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