GHSA-8f95-v3jq-cj86

Source

https://github.com/advisories/GHSA-8f95-v3jq-cj86

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-8f95-v3jq-cj86/GHSA-8f95-v3jq-cj86.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-8f95-v3jq-cj86

Aliases

Published

2026-07-09T13:42:46Z

Modified

2026-07-13T16:42:57Z

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.

Database specific

{
    "cwe_ids": [
        "CWE-122",
        "CWE-1284",
        "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-09T13:42:46Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
}

References

Affected packages

PyPI / pymonocypher

Package

Name: pymonocypher; View open source insights on deps.dev
Purl: pkg:pypi/pymonocypher

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

4.0.2.8

Affected versions

0.*

0.1.1

0.1.2

0.1.3

0.1.4

3.*

3.1.0.0

3.1.3.0

3.1.3.1

3.1.3.2

3.1.3.3

3.1.3.4

3.1.3.5

3.1.3.6

4.*

4.0.2.1

4.0.2.2

4.0.2.3

4.0.2.4

4.0.2.5

4.0.2.6

4.0.2.7

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-8f95-v3jq-cj86/GHSA-8f95-v3jq-cj86.json"