What’s Vulnerable › Vulnerabilities

CVE-2026-117503: a2aproject a2a-go REST SSE handler rest.go resource consumption

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-27 · updated 2026-10-27
• Weakness: CWE-400

Description

A vulnerability was determined in a2aproject a2a-go up to 2.4.0. Impacted is an unknown function of the file a2asrv/rest.go of the component REST SSE handler. This manipulation causes resource consumption. It is possible to initiate the attack remotely. Upgrading to version 2.5.0 is recommended to address this issue. Patch name: ff6035bd21e44bb3ee1bfa547885b8c08327fa01. It is recommended to upgrade the affected component.

Affected products

• a2aproject a2a-go: 2.0, 2.1, 2.2, 2.3, 2.4.0

References

• https://github.com/a2aproject/a2a-go/
• https://github.com/a2aproject/a2a-go/commit/ff6035bd21e44bb3ee1bfa547885b8c08327fa01
• https://github.com/a2aproject/a2a-go/pull/396
• https://github.com/a2aproject/a2a-go/releases/tag/v2.5.0
• https://vuldb.com/cve/CVE-2026-117503
• https://vuldb.com/submit/1015052
• https://vuldb.com/vuln/427070
• https://vuldb.com/vuln/427070/cti

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