JLSEC-2026-660

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Source

https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-660.md

Import Source

https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-660.json

JSON Data

https://api.osv.dev/v1/vulns/JLSEC-2026-660

Upstream

CVE-2026-55199

EUVD-2026-37782

GHSA-3cfq-4xx4-rmpg

Published

2026-07-10T13:57:40.607Z

Modified

2026-07-25T18:24:44.160535499Z

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
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Summary

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service...

Details

libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.

Database specific

{
    "sources": [
        {
            "imported": "2026-07-17T22:21:19.329Z",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-55199",
            "id": "CVE-2026-55199",
            "modified": "2026-07-14T22:17:17.043Z",
            "published": "2026-06-17T20:17:28.520Z",
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55199",
            "database_specific": {
                "status": "Analyzed"
            }
        },
        {
            "imported": "2026-07-17T22:21:19.539Z",
            "url": "https://api.github.com/advisories/GHSA-3cfq-4xx4-rmpg",
            "id": "GHSA-3cfq-4xx4-rmpg",
            "modified": "2026-06-17T21:34:45Z",
            "html_url": "https://github.com/advisories/GHSA-3cfq-4xx4-rmpg",
            "published": "2026-06-17T21:34:39Z"
        },
        {
            "imported": "2026-07-17T22:21:23.237Z",
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-37782",
            "id": "EUVD-2026-37782",
            "modified": "2026-07-14T21:33:54Z",
            "published": "2026-06-17T18:44:18Z",
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-37782"
        }
    ],
    "license": "CC-BY-4.0"
}

References

Affected packages

Julia / LibSSH2_jll

Package

Name: LibSSH2_jll
Purl: pkg:julia/LibSSH2_jll?uuid=29816b5a-b9ab-546f-933c-edad1886dfa8

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.11.102+0

Database specific

source

"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-660.json"