Malicious code in chai-as-rendered (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (545ba2341881e666831e81156a815fdfac738830ec2918167e4c5fd3c42294bf) Typosquat of chai-as-promised. The package's exported middleware spawns a detached child process (lib/caller.js) that fetches a JSON payload from a base64-obfuscated jsonstorage.net URL (https://api.jsonstorage.net/v1/json/2ef8c758-a96f-459e-b036-b3b90379a165/f89e8264-86c2-4684-94da-c3f82d59370f) and evaluates the returned.cookie string via new Function.constructor("require", s)(require), giving the fetched code full require access on the installer's host. The remote URL and request headers are stored as base64 strings under fake process.env names (DEV_API_KEY, DEV_SECRET_KEY, DEV_SECRET_VALUE) and decoded with atob() at runtime to conceal the destination. The package name and keywords (fast, logger, stream, json) impersonate pino while the package name typosquats chai-as-promised.
MAL-2026-12348
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:MAL-2026-12348
chai-as-rendered
Source reference: /affected/0/package/name
- Affected versions
- 1.2.0
Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"package": {
"name": "chai-as-rendered",
"purl": "pkg:npm/chai-as-rendered",
"ecosystem": "npm"
},
"versions": [
"1.2.0"
],
"database_specific": {
"cwes": [
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
}
],
"source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/chai-as-rendered/MAL-2026-12348.json",
"indicators": {
"evidence_files": [
{
"path": "lib/caller.js",
"tlsh": "6e01efd934fd501c021111ea171fa032a010e4373882d6c8374cc7428fa66bd2e93aef",
"sha256": "ffa61701ff61ebc0c6d64cf09f5bc37a74a91b03b716129b90271d758dc164b7"
},
{
"path": "package.json",
"tlsh": "0701c061ce749e7304dd21824c2a0643b6614c435528fd2933d7513d0f9d9bf01bf21d",
"sha256": "dfe14ad52936fd66e0d9f597459091f41a9f3ba899010bbde7a22f212bc6cd9b"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "9cb07e3ac4d77c8af3ce61f3887de233b0a42103",
"sha512_sri": "sha512-86s/uZXVv0i1Z2Ty1Uu2eR8ESjvwzF6ixTrhTBAsCDjkYH1Rc88L2tZfmsZvg6pZHuenOgg6GmsXdwKJIEZqqA=="
},
"filename": "chai-as-rendered-1.2.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #10957 · Revision 1
- Added to Heist Feed
- Publisher date