🛡️ MAL-2026-6993 — bytefaas-sdk

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Malicious code in bytefaas-sdk (npm)

Source: amazon-inspector

Package published at version 9999.0.0 under the name bytefaas-sdk, the canonical dependency-confusion shape used to shadow a private internal package of the same name. package.json declares a preinstall hook that runs callback.js. On any npm install, callback.js collects the installer's os.hostname(), os.userInfo().username, platform, and cwd and transmits them to a third-party Interactsh (oast.fun) endpoint via both a DNS lookup (encoded subdomain) and an HTTPS POST. The HTTPS request sets rejectUnauthorized: false, disabling TLS certificate verification on the beacon. The package's README self-describes as a bug-bounty canary against TikTok's internal build systems, but the exfiltration fires unconditionally against any installer whose resolver picks up this public 9999.0.0 release — including unrelated organizations and CI systems. Cover-story framing does not change that non-consenting installers' host identifiers leak to a third-party server.

Affected software

MAL-2026-6993 is recorded against 1 package.

  • bytefaas-sdk

Timeline and source

Published on 8 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.npmjs.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-08
Updated 2026-08-12
Modified 2026-07-08
Fix URL N/A

Affected Packages

Software From version Fixed in
bytefaas-sdk — —

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