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

• Severity: medium (CVSS 5.9 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: yes
• Published: 2026-04-08 · updated 2026-07-24
• Weakness: CWE-400

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.

Affected products

• axios: from 1.0.0 before 1.13.2 — fixed in 1.13.2

How to fix

Upgrade to a fixed version: axios 1.13.2. Check the vendor advisory for mitigations.

References

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

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