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Malicious code in cobrowsing-cobrowsing-core (npm)

0
Unknown
Published: 08/05/2026 (08/05/2026, 13:59:23 UTC)
Source: GCVE Database
Product: cobrowsing-cobrowsing-core

Description

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (c27e38e295cce55b33b75d72a22db6deb6a851e7739111a1979f8317961465b9) [email protected] is a binary dropper disguised as a platform core package. On require()/import (index.js loads _polyfill.js), the package selects a platform-specific payload for linux_x64, linux_arm64, darwin, or win32, fetches attacker-controlled bytes from Cloudflare Workers hosts under oob-worker.cf1xx-*.workers.dev, writes them to /var/tmp or %TEMP% under a disguised name (.cache_<rand> on POSIX, dotnet_diag_<rand>.exe on Windows), chmods to 0755, and spawns them detached via /bin/sh -c or cmd.exe. No signature or hash verification is performed. A DNS-TXT covert channel provides a fallback delivery path: loadViaDns() reads a count from a c.<domain> TXT record, then concatenates N numbered TXT records from sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, base64-decodes the result, and executes it. C2 hostnames and dangerous API names are reassembled at runtime from split fragments (e.g. ["oob-worker.cf103-070.w","ork","ers.","dev"].join(""), require("child_"+"process"), fs["chmod"+"Sync"]) as anti-scanner obfuscation. lib/telemetry.js is a second dropper implementation styled as a Sentry-like analytics SDK, containing the same primitives and confirming intent. Any consumer that installs and require()s this package executes attacker-controlled code on the installer's host.

Affected software

npmghsa
cobrowsing-cobrowsing-core
Affected versions
=35.5.8

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
MAL-2026-12651
Osv Schema Version
1.7.4
Aliases
[]
Ecosystems
["npm"]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a735735bf8831d539141f3e

Added to database: 08/05/2026, 15:31:01 UTC

Last updated: 08/05/2026, 15:31:01 UTC

Views: 1

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