CVE-2026-48158

Summary

use-context-selector is a React useContextSelector hook in userland Between 2026-05-18 15:57:18 and 2026-05-19 15:24:34, the default branch contained malicious commits 9d8481a513b7b0d1c0941b220c69b25de748641b through 6f2dae054ca014068bdbbb4db96006424d674124 that executed remote attacker-controlled code on developer machines during npm install. The commits were removed by force-push, but local clones, forks, and direct-SHA URLs may still contain them, and npm install against an affected checkout will still execute the code today. The package was not published to npm. src/install.js was added and wired into the postinstall script. It fetched a JavaScript payload from an attacker-controlled HTTPS endpoint (configurable via an environment variable), disabled TLS verification, and evaluated the response as code with require available. Execution was deliberately skipped on CI and cloud/serverless environments, targeting developer workstations. The second-stage payload was attacker-hosted and cannot be reconstructed. Assume full compromise of anything reachable from a Node process with the user's permissions. Those who ran npm install against an affected checkout on a developer machine on or after 2026-05-18 15:57:18 should treat the machine as compromised, rotate every credential the machine could reach, audit account activity** since 2026-05-18 15:57:18, and clean local clones.

Affected Software

Weaknesses

• CWE-506: CWE-506: Embedded Malicious Code

References

• https://github.com/dai-shi/use-context-selector/security/advisories/GHSA-7h6v-mwq6-jhm8

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