Vulnerability Description
pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i_32 implementation does not check the nb_blocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i_32 will write past the end of the buffer and possibly corrupt the heap. This issue has been patched in version 4.0.2.8.
Related Weaknesses (CWE)
References
- https://github.com/jetperch/pymonocypher/commit/90ff5b13b13b5673c372e188f482d8c1
- https://github.com/jetperch/pymonocypher/releases/tag/v4.0.2.8
- https://github.com/jetperch/pymonocypher/security/advisories/GHSA-8f95-v3jq-cj86
FAQ
What is CVE-2026-53720?
CVE-2026-53720 is a documented vulnerability. pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i_32 implementation does not check the nb_blocks size. If the caller does not provide a sufficiently larg...
How severe is CVE-2026-53720?
CVSS scoring is not yet available for CVE-2026-53720. Check NVD for updates.
Is there a patch for CVE-2026-53720?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.