Vulnerability · Published Oct 27, 2026 · Assigned by VulDB

CVE-2026-117507a2aproject a2a-java TaskManager.saveTaskEvent race condition

Medium 5.4

In plain English

A medium-severity race condition in a2a-java from a2aproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 72.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A security vulnerability has been detected in a2aproject a2a-java up to 1.2.0.Final. This impacts the function TaskManager.saveTaskEvent. The manipulation leads to race condition. The attack may be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. The identifier of the patch is 6b8e1e085c35e970ef0048901cd25850e4791ec2. The affected component should be upgraded.

Affected products (as reported)

Vendor	Product	Versions
a2aproject	a2a-java	1.2.0.Final

Weakness: CWE-362 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L/E:X/RL:O/RC:C

References

VDB-427074 | a2aproject a2a-java TaskManager.saveTaskEvent race condition vdb-entry, technical-description
VDB-427074 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
CVE-2026-117507 | CVE Analysis and Report third-party-advisory
Submit #1015060 | a2aproject a2a-java ≤ 1.2.0.Final CWE-362 third-party-advisory
https://github.com/a2aproject/a2a-java/pull/1045 issue-tracking, patch
https://github.com/a2aproject/a2a-java/commit/6b8e1e085c35e970ef0048901cd25850e4791ec2 patch
https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final patch
https://github.com/a2aproject/a2a-java/ product