JLSEC-2026-1373

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Source

https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-1373.md

Import Source

https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1373.json

JSON Data

https://api.osv.dev/v1/vulns/JLSEC-2026-1373

Upstream

CVE-2026-53587

EUVD-2026-63547

Published

2026-08-21T21:14:18.508Z

Modified

2026-08-21T21:30:03.330665751Z

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

[none]

Details

libgit2 is a portable C implementation of the Git core methods provided as a linkable library with a solid API, allowing to build Git functionality into your application. Prior to 1.8.6 and 1.9.5, libgit2 performs a fixed-size strncmp in set_data in src/libgit2/transports/smart_pkt.c without first verifying that the smart-protocol pkt-line capability buffer contains 14 bytes. A malicious Git server can make bytes after the pkt-line complete object-format=, causing format_str to advance beyond the pkt-line and the following memchr length calculation to underflow. The resulting heap out-of-bounds walk can crash a client during the first refs-advertisement packet over HTTP, HTTPS, SSH, or the Git protocol. This issue is fixed in versions 1.8.6 and 1.9.5.

Database specific

{
    "sources": [
        {
            "imported": "2026-08-21T20:45:03.782Z",
            "published": "2026-08-20T19:16:55.137Z",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-53587",
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53587",
            "modified": "2026-08-20T20:17:34.557Z",
            "database_specific": {
                "status": "Received"
            },
            "id": "CVE-2026-53587"
        },
        {
            "published": "2026-08-20T18:36:43Z",
            "affected": {
                "libgit2:libgit2": [
                    "1.9.0, < 1.9.5",
                    "< 1.8.6"
                ]
            },
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-63547",
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-63547",
            "modified": "2026-08-20T19:18:33Z",
            "imported": "2026-08-21T20:45:01.752Z",
            "id": "EUVD-2026-63547"
        }
    ],
    "license": "CC-BY-4.0"
}

References

Affected packages

Julia / LibGit2_jll

Package

Name: LibGit2_jll
Purl: pkg:julia/LibGit2_jll?uuid=e37daf67-58a4-590a-8e99-b0245dd2ffc5

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.9.6+0

Database specific

source

"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1373.json"