forge-gas-diff (npm) · Malicious Code
Affects forge-gas-diffSource GCVE Database
Malicious package : remove forge-gas-diff and rotate any secrets on hosts that installed it.
Data as of 8 Aug 2026, 14:53 UTC
Malicious package
Published to npm · OSV MAL-2026-13516
What to do
Remove forge-gas-diff from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npmforge-gas-diff | Affected
| Fixed in– |
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Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (4b1f6143f5a7c6106ab4ba0a21a6adaf9020e332835b1e528de6f36b64537734) index.js is advertised as a Foundry gas-report diff utility but on module load / CLI run schedules a setTimeout of 259,200,000 ms (3 days) that calls https.get against https://gist.githubusercontent.com/opensource-crypto/3946ef88aa057c9d10f1a7d80391d164/raw/default.json. The gist is hosted on a GitHub account (opensource-crypto) unrelated to the declared package publisher (danird9). If the fetched JSON contains a `c2` field, the value is persisted to ~/.forge-gas-diff.remote for later use. A separate getInstallId() routine writes a per-host UUID to ~/.forge-gas-diff, providing a stable install fingerprint. None of this behavior — outbound network fetch, install-ID generation, remote-config persistence, or a field literally named `c2` — has any relationship to the advertised gas-diff functionality and is not documented in the package. The gist is author-mutable, so the content delivered to installers can be changed at any time without republishing the package; the 3-day delay places the fetch well outside typical install-time sandboxing windows. The mechanism is the staging half of a remote-config-driven dropper: a hidden update channel keyed to attacker-editable content on a third-party host, with persistence to a well-known filesystem path on the installer's machine.