Medium
Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables
Type: advisorySources: OSV
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to versions 2.1.13 and 2.2.13, the `Deno.env.toObject` method ignores any variables listed in the `--deny-env` option of the `deno run` command. When looking at the documentation of the `--deny-env` option this might lead to a false impression that variables listed in the option are impossible to read. Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method. Versions 2.1.13 and 2.2.13 contains a patch.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-48934
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 19:28 UTC · Revision 1
Source evidence
Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables
core-osv · Original sourcePublished 4 Jun 2025, 19:21 UTC
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to versions 2.1.13 and 2.2.13, the `Deno.env.toObject` method ignores any variables listed in the `--deny-env` option of the `deno run` command. When looking at the documentation of the `--deny-env` option this might lead to a false impression that variables listed in the option are impossible to read. Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method. Versions 2.1.13 and 2.2.13 contains a patch.
osv:CVE-2025-48934
Complete source record
{
"id": "5da2cf7d4b5cc5fe22798105e6f76b37b2cdd182293bc9d591ea116a35360497",
"url": "https://osv.dev/vulnerability/CVE-2025-48934",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Deno.env.toObject() ignores the variables listed in --deny-env and returns all environment variables",
"summary": "Deno is a JavaScript, TypeScript, and WebAssembly runtime. Prior to versions 2.1.13 and 2.2.13, the `Deno.env.toObject` method ignores any variables listed in the `--deny-env` option of the `deno run` command. When looking at the documentation of the `--deny-env` option this might lead to a false impression that variables listed in the option are impossible to read. Software relying on the combination of both flags to allow access to most environment variables except a few sensitive ones will be vulnerable to malicious code trying to steal secrets using the `Deno.env.toObject()` method. Versions 2.1.13 and 2.2.13 contains a patch.",
"evidence": "osv:CVE-2025-48934",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-48934",
"aliases": [
"CVE-2025-48934",
"GHSA-7w8p-chxq-2789"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/denoland/deno",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5b85bdaf88e36a1fcae3e442d96f026e4e1f9b92"
},
{
"introduced": "29688168631edb677a444ba3cd02b2be21304a1f"
},
{
"fixed": "0117f27aef98e1bf9a8689fe5ab6b03b5a1453f7"
},
{
"fixed": "2959e083912420988066a001c2b2d6732a1b562f"
},
{
"fixed": "946ccda1aa19a00c478a5e6826b75053b050d753"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.1.13"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.2.0"
},
{
"fixed": "2.2.13"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "2959e083912420988066a001c2b2d6732a1b562f"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "946ccda1aa19a00c478a5e6826b75053b050d753"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-48934.json"
}
}
],
"modified": "2026-10-28T02:30:31.666106351Z",
"provider": "osv",
"references": [
"https://docs.deno.com/api/deno/~/Deno.Env.toObject",
"https://docs.deno.com/runtime/fundamentals/security/#environment-variables",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48934.json",
"https://github.com/denoland/deno/security/advisories/GHSA-7w8p-chxq-2789",
"https://nvd.nist.gov/vuln/detail/CVE-2025-48934",
"https://github.com/denoland/deno/commit/2959e083912420988066a001c2b2d6732a1b562f",
"https://github.com/denoland/deno/commit/946ccda1aa19a00c478a5e6826b75053b050d753",
"https://github.com/denoland/deno/pull/29079"
],
"provider_metadata": {
"cwe_ids": [
"CWE-201"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/48xxx/CVE-2025-48934.json"
}
},
"related_cves": [
{
"value": "CVE-2025-48934",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498718,
"published_at": "2025-06-04T19:21:17.701+00:00"
}