CVE-2026-47066
7.5 HIGHLoop with Unreachable Exit Condition ('Infinite Loop') vulnerability in benoitc hackney allows Excessive Allocation
Published: 2026-05-25 · Last updated: 2026-05-27
Severity and scoring
- CVSS
- 7.5 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-835
Affected products
| Vendor | Product |
|---|---|
| benoitc | hackney |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-47066
- [Patch]https://cna.erlef.org/cves/CVE-2026-47066.html
- [Patch]https://github.com/benoitc/hackney/commit/e548aba1f97ffa3f4750da7b772998fb78c01894
- [Patch]https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
- [Patch]https://osv.dev/vulnerability/EEF-CVE-2026-47066
- [Patch]https://github.com/benoitc/hackney/security/advisories/GHSA-6cp8-v795-jr2j
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