appsignal
This report shows the evidence for appsignal@9999.0.0, the only known version.
This package appears in our research on the dependency confusion probes at version 99 and above, with how it works, the full package list and what to do if you installed it.
OpenSSF/OSV Malicious Advisory
imported 3mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-12512 confirms this npm version as malicious.
Advisory
MAL-2026-12512
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in appsignal (npm)
Details
Package name `appsignal` shadows the legitimate `@appsignal/*` scope and is published at version `9999.0.0`, a version-number pattern used to outrank private/internal dependencies during resolution. A `preinstall` script runs automatically on `npm install` and issues an HTTP GET to the hardcoded bare-IP endpoint `http://75.119.137.232:31337/depconfuse`, carrying the installer's `os.hostname()`, `os.userInfo().username`, `process.cwd()`, `npm_config_registry`, and CI repository-slug environment variables (`GITHUB_REPOSITORY`, `CI_PROJECT_PATH`, `BUILD_REPOSITORY_NAME`, `BITBUCKET_REPO_FULL_NAME`, `TRAVIS_REPO_SLUG`, `DRONE_REPO`, `BUILDKITE_PIPELINE_SLUG`, `CIRCLE_PROJECT_REPONAME`, `JOB_NAME`) as query parameters. The endpoint path `/depconfuse`, the bare-IP destination, the `9999.0.0` version, and the shadowing of an established scope indicate a dependency-confusion reconnaissance probe designed to identify internal build systems that resolve the public name over an intended private package.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to appsignal@9999.0.0.
The versions list below shows the verdict for each recorded version.
- Avoid installing appsignal@9999.0.0. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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