JLSEC-2026-1220

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Source

https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-1220.md

Import Source

https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1220.json

JSON Data

https://api.test.osv.dev/v1/vulns/JLSEC-2026-1220

Upstream

CVE-2026-9545

EUVD-2026-41493

GHSA-6v72-wfcj-jv53

Published

2026-08-07T20:11:58.984Z

Modified

2026-08-07T20:29:05.800395724Z

Severity

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

Summary

In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when...

Details

In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate.

When libcurl returns to the hostname the second time with a cached SSL session (CURLOPT_SSL_SESSIONID_CACHE is not disabled) and early data enabled (the CURLSSLOPT_EARLYDATA bit is set in CURLOPT_SSL_OPTIONS), libcurl might send off the second request's bytes on that new connection before enforcing the certificate verification failure. Potentially leaking sensitive information.

Database specific

{
    "license": "CC-BY-4.0",
    "sources": [
        {
            "imported": "2026-08-07T19:54:38.989Z",
            "database_specific": {
                "status": "Analyzed"
            },
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9545",
            "id": "CVE-2026-9545",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-9545",
            "published": "2026-07-03T07:16:25.807Z",
            "modified": "2026-07-07T15:03:56.920Z"
        },
        {
            "imported": "2026-08-07T19:56:04.342Z",
            "id": "GHSA-6v72-wfcj-jv53",
            "html_url": "https://github.com/advisories/GHSA-6v72-wfcj-jv53",
            "url": "https://api.github.com/advisories/GHSA-6v72-wfcj-jv53",
            "published": "2026-07-03T09:31:27Z",
            "modified": "2026-07-06T18:30:50Z"
        },
        {
            "imported": "2026-08-07T19:55:05.504Z",
            "id": "EUVD-2026-41493",
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-41493",
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-41493",
            "published": "2026-07-03T06:17:55Z",
            "modified": "2026-07-06T16:53:23Z"
        }
    ]
}

References

Affected packages

Julia / CURL_jll

Package

Name: CURL_jll
Purl: pkg:julia/CURL_jll?uuid=b21e61f3-bafc-59ac-ab14-4c5c62d6588d

Affected ranges

Type: SEMVER
Events: Introduced

8.11.0+0

Fixed

8.21.0+0

Database specific

source

"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1220.json"

Julia / LibCURL_jll

Package

Name: LibCURL_jll
Purl: pkg:julia/LibCURL_jll?uuid=deac9b47-8bc7-5906-a0fe-35ac56dc84c0

Affected ranges

Type: SEMVER
Events: Introduced

8.11.0+0

Fixed

8.21.0+0

Database specific

source

"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-1220.json"