CVE-2026-47066

Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation. The Alt-Svc response header parser in src/hackney_altsvc.erl does not guarantee forward progress. When parse_token/2 receives a non-token, non-whitespace, non-comma byte (e.g. !, @, =, ;), it returns the input unchanged. skip_comma/1 also returns the buffer unchanged when the first byte is not a comma. parse_entries/2 then recurses with identical data, creating a tight infinite tail-recursive loop that pins a scheduler at 100% CPU. The calling process never returns. The entry point parse_and_cache/3 is called synchronously in the connection process on every HTTP response. A single-byte Alt-Svc: ! response header is sufficient to trigger the hang; the header is fully controlled by any HTTP origin the client connects to. This issue affects hackney: from 2.0.0-beta.1 before 4.0.1.

• CWE-835

• https://cna.erlef.org/cves/CVE-2026-47066.htmlPatch, Third Party Advisory
• https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894Patch
• https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2jExploit, Patch, Vendor Advisory
• https://osv.dev/vulnerability/EEF-CVE-2026-47066Patch, Third Party Advisory
• https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2jExploit, Patch, Vendor Advisory

Published

May 25, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-47060Vulnerability in the JDBC component of Oracle Database Serve…6.5
• CVE-2026-47061Vulnerability in the JDBC component of Oracle Database Serve…5.6
• CVE-2026-47062Vulnerability in the Oracle VM VirtualBox product of Oracle …5.5
• CVE-2026-47063Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK,…7.5
• CVE-2026-47064Vulnerability in the MySQL Server, MySQL Cluster product of …6.5
• CVE-2026-47065ZDRES-232: resolveProxyClass Not Overridden - acceptMatchers…9.8
• CVE-2026-47067Allocation of Resources Without Limits or Throttling vulnera…7.5
• CVE-2026-47068Authorization Bypass Through User-Controlled Key vulnerabili…2.3
• CVE-2026-47069Improper Neutralization of CRLF Sequences ('CRLF Injection')…5.3
• CVE-2026-4707Incorrect boundary conditions in the Graphics: Canvas2D comp…7.5
• CVE-2026-47070Sensitive Data Exposure vulnerability in benoitc hackney all…6.1
• CVE-2026-47071Uncontrolled Resource Consumption vulnerability in benoitc h…7.5