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TI-2026-78641 Aliases CVE-2026-113706

Information disclosure in a2aproject a2a-rs in-memory task store

Priority LOW 23CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure, Security bypass
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 and CWE-284.

Summary

a2aproject a2a-rs up to 0.4.3 is affected. Manipulating the historyLength argument in the in-memory task store (a2a-server/src/task_store/inmemory.rs) exposes information to unauthorized users (CWE-200). A remote attacker with low privileges can obtain this information.

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

Description from the CNA

A vulnerability was identified in a2aproject a2a-rs up to 0.4.3. Impacted is an unknown function of the file a2a-server/src/task_store/inmemory.rs. The manipulation of the argument historyLength leads to information disclosure. The attack is possible to be carried out remotely. The identifier of the patch is 68f1b7e772ae5d6c9e581ac9b48bcddd10fe70eb. To fix this issue, it is recommended to deploy a patch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0025 16th 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
No
Technical impact
Partial

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

Affected products

VendorProductAffected versionsFixed inStatusSource
a2aprojecta2a-rs0.4.0; 0.4.1; 0.4.2; 0.4.3—No fix listedCNA
  • 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

CPEVersionsRoleVendor
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 a2a-rs. The sources recommend deploying the patch with identifier 68f1b7e772ae5d6c9e581ac9b48bcddd10fe70eb.

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

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-113706
  2. 2026-10-27 CISA SSVC decision points changed

References

Patch 2

Other 1

  • 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