CVE-2026-47077Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-400
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jul 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
benoitc hackney benoitc:hackney | from 2.0.0 before 4.0.1 | NVD |
References
- https://cna.erlef.org/cves/CVE-2026-47077.htmlpatch, third-party-advisory
- https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bcpatch
- https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwcexploit, patch, vendor-advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-47077patch, third-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.