CVE-2026-49983

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Source
https://cve.org/CVERecord?id=CVE-2026-49983
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49983.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-49983
Aliases
Published
2026-06-23T17:16:17.026Z
Modified
2026-07-15T01:49:04.962061279Z
Severity
  • 5.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
Deno: process.loadEnvFile() bypasses env permission checks and mutates process.env with only read access
Details

Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to 2.8.1, environment access is gated by the env permission. You can deny it with --deny-env, or restrict it to a specific allowlist with --allow-env=FOO,BAR. The expectation is that a program running without env permission cannot change process.env. process.loadEnvFile() (the Node-compatible API for loading variables from a .env file) does not honor this. It only checks that the program has read permission for the dotenv file, then writes every key in that file into the process environment — even when env access is denied. In effect, --allow-read plus a writable or attacker-controlled .env file is enough to defeat --deny-env. This vulnerability is fixed in 2.8.1.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49983.json",
    "cwe_ids": [
        "CWE-863"
    ]
}
References

Affected packages

Git / github.com/denoland/deno

Affected ranges

Type
GIT
Repo
https://github.com/denoland/deno
Events
Introduced
61574bb9c9c255d5c661add6c7464af30475c197
Fixed
3e2030bc01776ce6b4ca355b1e78c4cb98c82dca
Database specific 
{
    "cpe": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.8.1"
        },
        {
            "introduced": "2.3.0"
        }
    ]
}

Affected versions

v2.*
v2.3.0
v2.3.1
v2.3.2
v2.3.3
v2.3.4
v2.3.5
v2.3.6
v2.3.7
v2.4.0
v2.4.1
v2.4.2
v2.4.3
v2.4.4
v2.4.5
v2.5.0
v2.5.1
v2.5.2
v2.5.3
v2.5.4
v2.5.5
v2.5.6
v2.6.0
v2.6.10
v2.6.2
v2.6.3
v2.6.4
v2.6.5
v2.6.6
v2.6.7
v2.6.8
v2.6.9
v2.7.0
v2.7.1
v2.7.10
v2.7.11
v2.7.12
v2.7.13
v2.7.14
v2.7.2
v2.7.3
v2.7.4
v2.7.5
v2.7.6
v2.7.7
v2.7.8
v2.7.9
v2.8.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49983.json"