CVE-2026-73568

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Source

https://cve.org/CVERecord?id=CVE-2026-73568

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73568.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-73568

Aliases

GHSA-hmj8-5xmh-5573

Published

2026-08-13T17:43:26.065Z

Modified

2026-08-15T11:45:15.834919179Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

py-libp2p: yamux connection DoS via oversized data frame

Details

py-libp2p is the Python implementation of the libp2p networking stack. In 0.7.0 and earlier, the yamux handleincoming() method in libp2p/streammuxer/yamux/yamux.py reads an attacker-controlled 32-bit DATA frame length with readexactly() before validating it against MAXWINDOWSIZE or checking whether streamid exists. A peer that completes the standard Noise handshake can send a 12-byte frame declaring a 0xFFFFFFFF body and then withhold the body, causing the sequential yamux read loop used by the default new_host() configuration to block and preventing every stream on that connection from making progress. No fixed version is available as of this review.

Database specific

{
    "cwe_ids": [
        "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73568.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/libp2p/py-libp2p

Affected ranges

Type

GIT

Repo

https://github.com/libp2p/py-libp2p

Events

Introduced

Fixed

146ea87d1a20cc7dacf684ecf7c204543be04b37

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "0.7.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*

v0.1.0

v0.1.1

v0.1.2

v0.1.3

v0.1.4

v0.1.5

v0.2.0

v0.2.1

v0.2.10

v0.2.2

v0.2.3

v0.2.4

v0.2.5

v0.2.6

v0.2.7

v0.2.8

v0.2.9

v0.3.0

v0.4.0

v0.5.0

v0.6.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73568.json"