semer

GHSA-2jc4-7fx8-385m

Malicious code in semer (PyPI)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: kam193 (7479f42de6f963e39b7aa1409b586e605dca69978763ab35236d20c9126aa4f1)
During installation, package downloads and executes malware.


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Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.


Campaign: 2026-10-semvver


Reasons (based on the campaign):


 - Downloads and executes a remote executable.


 - malware


 - typosquatting

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/6c74a902b33d420c54d8ff22351013134868ebf3/osv/malicious/pypi/semer/MAL-2026-18118.json))

**References:**
- https://bad-packages.kam193.eu/pypi/package/semer
- https://github.com/ossf/malicious-packages/blob/6c74a902b33d420c54d8ff22351013134868ebf3/osv/malicious/pypi/semer/MAL-2026-18118.json
- https://www.virustotal.com/gui/file/e6d96b5500b232bea67f6f9046cfbc22d29a515c42d2af9523a15ebe8a7c4ab7
- https://github.com/ossf/malicious-packages/blob/65a30c2bd1748889a5fb95a96da4a49b781c4b60/osv/malicious/pypi/semer/MAL-2026-18118.json
- https://github.com/advisories/GHSA-2jc4-7fx8-385m

Compromised versions (1)

= 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.