CVE-2026-53720

mediumcovered by 1 sourcefirst seen 2026-07-09

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.

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Advisory coverage (1)

mediumGHSA-8f95-v3jq-cj86: pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buf…ghsa · 2026-07-09

External references

NVD record for CVE-2026-53720

CVE.org record

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