PYSEC-2026-3000
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/pymonocypher/PYSEC-2026-3000.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-3000
- Aliases
- Published
- 2026-07-13T15:46:30Z
- Modified
- 2026-07-13T16:33:07Z
- Severity
-
- 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buffer is too small
- Details
-
Impact
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.
Patches
Fixed in 4.0.2.8, which now verifies that nb_blocks is large enough. See 90ff5b1.
Workarounds
Provide a correctly sized nb_blocks buffer.
pymonocypher thanks Haris (hextheshadow) for the vulnerability report, details, and recommended fix.
- References
-
- https://github.com/jetperch/pymonocypher/security/advisories/GHSA-8f95-v3jq-cj86
- https://github.com/jetperch/pymonocypher/commit/90ff5b13b13b5673c372e188f482d8c172e6ab86
- https://github.com/jetperch/pymonocypher
- https://pypi.org/project/pymonocypher
- https://github.com/advisories/GHSA-8f95-v3jq-cj86
- https://nvd.nist.gov/vuln/detail/CVE-2026-53720
Affected packages
PyPI / pymonocypher
Package
- Name
- pymonocypher
- View open source insights on deps.dev
- Purl
- pkg:pypi/pymonocypher
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed4.0.2.8