Vulnerability · Published Oct 26, 2026 · Assigned by VulDB

CVE-2026-116479a2aproject a2a-java JSON-RPC Error getMessage information exposure

Medium 4.3

In plain English

A medium-severity information exposure 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 25% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 75.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A flaw has been found in a2aproject a2a-java up to 1.2.0.Final. This impacts the function getMessage of the component JSON-RPC Error Handler. This manipulation causes information exposure through error message. The attack can be initiated remotely. Upgrading to version 1.3.0.Final will fix this issue. Patch name: bbee3369f3825d0fba2373d821f6dc6d4fc82ec0. Upgrading the affected component is advised.

Affected products (as reported)

Vendor	Product	Versions
a2aproject	a2a-java	1.2.0.Final

Weakness: CWE-209, CWE-200 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:C

References

VDB-426392 | a2aproject a2a-java JSON-RPC Error getMessage information exposure vdb-entry, technical-description
VDB-426392 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-116479 | CVE Analysis and Report third-party-advisory
Submit #1014889 | a2aproject a2a-java ≤ v1.2.0.Final CWE-209 third-party-advisory
https://github.com/a2aproject/a2a-java/pull/1046 issue-tracking, patch
https://github.com/a2aproject/a2a-java/commit/bbee3369f3825d0fba2373d821f6dc6d4fc82ec0 patch
https://github.com/a2aproject/a2a-java/releases/tag/v1.3.0.Final patch
https://github.com/a2aproject/a2a-java/ product