CVE-2026-47077

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Source

https://cve.org/CVERecord?id=CVE-2026-47077

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47077.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-47077

Aliases

Published

2026-05-25T14:00:42.217Z

Modified

2026-07-08T08:13:37.111547123Z

Severity

8.2 (High) CVSS_V4 - 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 CVSS Calculator

Summary

Unbounded body accumulation in HTTP/3 response loop in hackney

Details

Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackneyh3:awaitresponse_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.

Database specific

{
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "0334af206d5099fdf510ed9eda18e34396f065ad"
                },
                {
                    "fixed": "3d25f9fea26c90609de9d64366fedfe5065413bc"
                }
            ]
        }
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47077.json",
    "cwe_ids": [
        "CWE-400"
    ],
    "cna_assigner": "EEF"
}

References

Affected packages

Git / github.com/benoitc/hackney

Affected ranges

Type

GIT

Repo

https://github.com/benoitc/hackney

Events

Introduced

a7ce34b42892ab305b2ef7dbe873bcabf4ef93ca

Fixed

c41c8d48ace8141b003f6f1de3ca6734a0c53056

Fixed

3d25f9fea26c90609de9d64366fedfe5065413bc

Database specific

{
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "cpe": "cpe:2.3:a:benoitc:hackney:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "4.0.1"
        }
    ]
}

Affected versions

2.*

2.0.0

2.0.1

3.*

3.0.1

3.0.2

3.0.3

3.1.0

3.1.1

3.1.2

3.2.0

3.2.1

4.*

4.0.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47077.json"