CVE-2026-47077
7.5 HIGHAllocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding
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-400
Affected products
| Vendor | Product |
|---|---|
| benoitc | hackney |
Description
Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition. This issue affects hackney: from 2.0.0 before 4.0.1.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-47077
- [Patch]https://cna.erlef.org/cves/CVE-2026-47077.html
- [Patch]https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc
- [Patch]https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc
- [Patch]https://osv.dev/vulnerability/EEF-CVE-2026-47077
- [Patch]https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc
Related CVEs
Same vendor
- CVE-2026-47076 — Interpretation Conflict vulnerability in benoitc hackney allows Server Side Request Forgery (6.5 MEDIUM)
- CVE-2026-47075 — Improper Neutralization of CRLF Sequences vulnerability in benoitc hackney allows HTTP Request Splitting (7.5 HIGH)
- CVE-2026-47073 — Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding (7.5 HIGH)
- CVE-2026-47072 — Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in benoitc hackney allows HTTP Request/Response Splitting (7.5 HIGH)
- CVE-2026-47071 — Uncontrolled Resource Consumption vulnerability in benoitc hackney allows Flooding (7.5 HIGH)
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