---
id: "CVE-2026-113707"
kind: "vulnerability"
aliases: ["CVE-2026-113707"]
title: "a2a-rs agent server: race condition in in-memory task store updates"
severity: "medium"
cvss: 5.5
epss: 0.00258
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["a2a", "agent-server", "ai-tooling", "rust"]
not_affected_if: ["client-only-use"]
published_at: "2026-10-21T00:17:49+00:00"
first_seen_at: "2026-10-23T21:57:27+00:00"
updated_at: "2026-10-25T04:12:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113707", "first_seen_at": "2026-10-23T21:57:27+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-113707", "first_seen_at": "2026-10-24T13:15:55+00:00"}]
---

# a2a-rs agent server: race condition in in-memory task store updates

a2a-rs, a Rust implementation of the agent-to-agent protocol, has a race condition in InMemoryTaskStore::update in versions up to 0.4.4. The sources do not describe what an attacker gains beyond the race itself.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the locked version of `a2a-rs` in Cargo.lock or the Cargo.toml dependency; versions up to `0.4.4` are affected.
- Check whether the code uses the `a2a-server` crate with the in-memory task store (`InMemoryTaskStore`).

## Fix

- Move `a2a-rs` past `0.4.4` to a release that includes commit `7050c7d329238539424ee46440e23b91c4825bee`; the fixed release number is unknown.

## Timeline

- 2026-10-23T21:57:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113707
- 2026-10-24T13:15:55+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-113707

## From the sources

A security flaw has been discovered in a2aproject a2a-rs up to 0.4.4. The affected element is the function InMemoryTaskStore::update of the file a2a-server/src/task_store/inmemory.rs. The manipulation results in race condition. The attack may be performed from remote. The patch is identified as 7050c7d329238539424ee46440e23b91c4825bee. It is advisable to implement a patch to correct this issue.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_