TI-2026-78640 Aliases CVE-2026-113705

Information exposure through error messages in a2aproject a2a-rs

LOW 36CWE-200Published 2026-10-20 · Updated 2026-10-28

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

The a2aproject a2a-rs versions 0.4.0, 0.4.1, 0.4.2 and 0.4.3 are affected. Processing in a2a-server/src/error.rs produces error messages that expose sensitive information (CWE-209). A remote attacker can trigger this without privileges or user interaction. The flaw is not listed in CISA KEV and no public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

A vulnerability was determined in a2aproject a2a-rs up to 0.4.3. This issue affects some unknown processing of the file a2a-server/src/error.rs. Executing a manipulation can lead to information exposure through error message. The attack can be executed remotely. This patch is called 713b943af94ab2d521d483b841618b97a2e78a4d. A patch should be applied to remediate this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00332 26th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
a2aproject	a2a-rs	0.4.0; 0.4.1; 0.4.2; 0.4.3	—	No fix listed	CNA

a2a-rs Vendora2aproject Affected 0.4.0; 0.4.1; 0.4.2; 0.4.3 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:a2aproject:a2a-rs::::::::	—	—	a2aproject

cpe:2.3:a:a2aproject:a2a-rs:*:*:*:*:*:*:*:* Versions — — ·a2aproject

Remediation

The sources list no fixed version for a2aproject a2a-rs. The source description says a patch should be applied and names patch 713b943af94ab2d521d483b841618b97a2e78a4d.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

2026-10-21 Threatist record created from CVE-2026-113705
2026-10-22 Priority changed: MEDIUM → LOW
2026-10-28 CISA SSVC decision points changed

References

Patch 2

Other 1

https://github.com/a2aproject/a2a-rs/

TI-2026-76905 Android A2A Java SDK forwards API keys across redirects CVSS 3.1HIGH 7.5
TI-2026-76904 A2A Java SDK default task store skips authorization on task reads CVSS 3.1HIGH 7.5
TI-2026-76847 Server-side request forgery in A2A Java SDK push notifications CVSS 3.1MEDIUM 5.8
TI-2026-81183 Resource consumption in a2aproject a2a-go REST SSE handler CVSS 4.0MEDIUM 6.9
TI-2026-61722 HTTP response splitting in a2aproject a2a-java CVSS 4.0MEDIUM 6.9
TI-2026-81185 Denial of service in a2aproject a2a-go Distributed Manager Cancel CVSS 4.0MEDIUM 6.9

See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences