CVE-2026-39847: Emmett has a path traversal in internal assets handler

April 8, 2026 (updated June 6, 2026)

The RSGI static handler for Emmett’s internal assets (/__emmett__ paths) is vulnerable to path traversal attacks.

An attacker can use ../ sequences (eg /__emmett__/../rsgi/handlers.py) to read arbitrary files outside the assets directory.

References

github.com/advisories/GHSA-pr46-2v3c-5356
github.com/emmett-framework/emmett/security/advisories/GHSA-pr46-2v3c-5356
github.com/pypa/advisory-database/tree/main/vulns/emmett/PYSEC-2026-59.yaml
nvd.nist.gov/vuln/detail/CVE-2026-39847

Code Behaviors & Features

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