CVE-2026-47066

216.73.217.22

· Published 25/05/2026 15:16 · Modified 26/05/2026 19:58

Labels: CVE-2026-47066 2026-05-25 6b3ad84c-e1a6-4bf7-a703-f496b71e49db CVE-2026-47066 CWE-835

Essential information

Published: 25/05/2026 15:16
Modified: 26/05/2026 19:58
Author: —
Creator: —
CVSS: 8.7 HIGH (v3) 8.7 HIGH (v4.0)
CISA KEV: No
CWE: —
CVSS vector: —

CVSS metrics

Description

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.

NVD status

Status: Undergoing Analysis — CVE has been recently published to the CVE List and has been received by the NVD.
Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
NVD: View on NVD

Affected products (CPE)

Product	CPE
benoitc / hackney	`cpe:2.3:a:benoitc:hackney:2.0.0-beta.1-4.0.0:::::::*`
benoitc / hackney	`cpe:2.3:a:benoitc:hackney:<4.0.1:::::::*`