Axios: Denial of Service via Unhandled 'error' Event in HTTP/2 ClientHttp2Session Initialization

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

Axios is a promise-based HTTP client for the browser and Node.js. From 1.13.0 until 1.20.0, Http2Sessions does not install adequate error handling for a ClientHttp2Session during Axios HTTP/2 session initialization or reuse. A request uses httpVersion: 2 and the ClientHttp2Session emits an error during session initialization or reuse. The unhandled session error escapes normal Promise rejection handling. The uncaught error can terminate the Node.js process and cause denial of service. This issue is fixed in version 1.20.0.

[ Fixes ]Fixes and patches

• axios 1.20.0Fixed version · GitHub Advisories · npm package axios: upgrade to 1.20.0 or later (affected >= 1.13.0, < 1.20.0)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4056

  Atlassian products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye and Jira): Multiple vulnerabilities Translated from German

  CVE-2026-13676CVE-2026-50750CVE-2026-53404+72 more CVEs
• CERT-FR16 Oct 2026CERTFR-2026-AVI-1336

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-14671CVE-2026-11548CVE-2022-22950+490 more CVEs

[ Packages ]Affected open-source packages

• axios npmAffected >= 1.13.0, < 1.20.0 · fixed in 1.20.0 · GHSA-542g-h47m-68v8

[ References ]References

• github.com/axios/axios/commit/d19040bda7a8be2f82c3c6e1a5bc03917daee39a
• github.com/axios/axios/pull/11141
• github.com/axios/axios/releases/tag/v1.20.0
• github.com/axios/axios/security/advisories/GHSA-542g-h47m-68v8