EEF-CVE-2026-47066
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-47066.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-47066.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-47066
- Aliases
-
- CVE-2026-47066
- GHSA-6cp8-v795-jr2j
- Published
- 2026-05-25T14:00:39.707Z
- Modified
- 2026-05-26T19:46:40.305Z
- Severity
-
- 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Infinite loop in Alt-Svc header parser in hackney
- Details
-
Summary
Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation. The Alt-Svc response header parser in src/hackneyaltsvc.erl does not guarantee forward progress. When parsetoken/2 receives a non-token, non-whitespace, non-comma byte (e.g. !, @, =, ;), it returns the input unchanged. skipcomma/1 also returns the buffer unchanged when the first byte is not a comma. parseentries/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 parseandcache/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.
- Database specific
{ "cpe_ids": [ "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*" ], "capec_ids": [ "CAPEC-130" ], "cwe_ids": [ "CWE-835" ] }- References
- Credits
-
-
- Peter Ullrich - FINDER
-
- Benoit Chesneau - REMEDIATION_DEVELOPER
-
- Jonatan Männchen - ANALYST
-
Affected packages
Hex / hackney
Package
- Name
- hackney
- Purl
- pkg:hex/hackney