JLSEC-2026-1257

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Source

https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-1257.md

Import Source

https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1257.json

JSON Data

https://api.osv.dev/v1/vulns/JLSEC-2026-1257

Upstream

CVE-2026-11404

EUVD-2026-42605

GHSA-cvgj-gr8r-q762

Published

2026-08-12T07:17:34.116Z

Modified

2026-08-12T07:43:45.656517460Z

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
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/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

Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function...

Details

Cesanta Mongoose before 7.22 contains an out-of-bounds read in the built-in TLS server function mg_tls_server_recv_hello(), which uses an attacker-controlled session_id_len byte from a TLS ClientHello as a buffer index without validating it against the length of received data. A remote, unauthenticated attacker can send a single crafted ClientHello with an oversized session id length to read past the receive buffer, crashing any HTTPS, MQTTS, or WSS service built on MG_TLS_BUILTIN.

Database specific

{
    "sources": [
        {
            "database_specific": {
                "status": "Deferred"
            },
            "id": "CVE-2026-11404",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-11404",
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11404",
            "modified": "2026-07-28T03:16:43.060Z",
            "imported": "2026-08-10T09:19:09.074Z",
            "published": "2026-07-09T16:16:34.640Z"
        },
        {
            "id": "GHSA-cvgj-gr8r-q762",
            "url": "https://api.github.com/advisories/GHSA-cvgj-gr8r-q762",
            "html_url": "https://github.com/advisories/GHSA-cvgj-gr8r-q762",
            "modified": "2026-07-09T18:31:51Z",
            "imported": "2026-08-10T09:19:09.947Z",
            "published": "2026-07-09T18:31:50Z"
        },
        {
            "id": "EUVD-2026-42605",
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-42605",
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42605",
            "modified": "2026-07-28T01:48:21Z",
            "imported": "2026-08-10T09:18:49.356Z",
            "published": "2026-07-09T15:13:40Z"
        }
    ],
    "license": "CC-BY-4.0"
}

References

Affected packages

Julia / Mongoose_jll

Package

Name: Mongoose_jll
Purl: pkg:julia/Mongoose_jll?uuid=0a8a3f5b-4c0e-5906-8e29-5b3fee15539c

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Database specific

source

"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1257.json"