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CVE-2026-47077— Unbounded body accumulation in HTTP/3 response loop in hackney

Quick assessment

Affected
benoitc hackney
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hackney是Hackney公司的一个程序库。 Hackney 2.0.0至4.0.1之前版本存在安全漏洞，该漏洞源于HTTP/3响应体累积无大小限制，可能导致资源耗尽。

AI Predicted 7.5 Difficulty: Easy EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 2

VendorProduct Version RangeStatus
benoitc hackney 2.0.0< 4.0.1 affected
0334af206d5099fdf510ed9eda18e34396f065ad< 3d25f9fea26c90609de9d64366fedfe5065413bc affected
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I. Basic Information for CVE-2026-47077

Vulnerability Information
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Vulnerability Title
Unbounded body accumulation in HTTP/3 response loop in hackney
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Hackney 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hackney是Hackney公司的一个程序库。 Hackney 2.0.0至4.0.1之前版本存在安全漏洞，该漏洞源于HTTP/3响应体累积无大小限制，可能导致资源耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
benoitc hackney 2.0.0 ~ 4.0.1 cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*
benoitc hackney 0334af206d5099fdf510ed9eda18e34396f065ad ~ 3d25f9fea26c90609de9d64366fedfe5065413bc cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-47077

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-47077

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Patches & Fixes for CVE-2026-47077 (1)

Vendor Advisories for CVE-2026-47077 (3)

Same Patch Batch · benoitc · 2026-05-25 · 10 CVEs total

CVE-2026-47075 6.8 MEDIUM CR/LF injection in query parameter in hackney
CVE-2026-47070 HTTP/3 redirect handler leaks Authorization and Cookie headers to cross-origin redirect ta
CVE-2026-47069 CRLF injection in cookie domain/path options in hackney
CVE-2026-47076 SSRF allowlist bypass via percent-encoded host in hackney
CVE-2026-47073 Unbounded memory consumption in WebSocket client in hackney
CVE-2026-47072 CRLF injection in WebSocket upgrade request in hackney
CVE-2026-47067 Atom table exhaustion via unrecognized URL schemes in hackney
CVE-2026-47071 SOCKS5 TLS upgrade ignores caller timeout in hackney
CVE-2026-47066 Infinite loop in Alt-Svc header parser in hackney

IV. Related Vulnerabilities

Same product: hackney
Same vendor: benoitc
Same weakness: CWE-400

V. Comments for CVE-2026-47077

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