GHSA-qq2p-4282-cfc5

Source

https://github.com/advisories/GHSA-qq2p-4282-cfc5

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qq2p-4282-cfc5/GHSA-qq2p-4282-cfc5.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qq2p-4282-cfc5

Published

2026-05-18T15:36:18Z

Modified

2026-05-18T15:49:40.343772Z

Severity

7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L CVSS Calculator

Summary

eduMFA: Incorrect InnoDB snapshot isolation possibly allows token reusage

Details

Impact

For deployments using MySQL or MariaDB < 11.6.2 (or newer with innodbsnapshotisolation=off) reusage of token values might be possible due to faulty transaction isolation inside the database. Exploiting this requires racing this transaction. Affected are all tokentypes whose values are only supposed to be used once, for example TOTP, HOTP and likely also WebAuthN.

Affected Combinations:

MySQL (any version)
MariaDB with innodbsnapshotisolation=OFF
- innodbsnapshotisolation was introduced in: MariaDB 10.6.18, MariaDB 10.11.8, MariaDB 11.0.6, MariaDB 11.1.5, MariaDB 11.2.4, MariaDB 11.4.2 with default OFF, can be turned ON as a workaround
- for MariaDB >= 11.6.2 the default is ON, which is not affected
Same rules applies for Galera with underlying MariaDB

Patches

Fixed in version 2.9.1 by locking rows prior to write with SELECT FOR UPDATE.

Workarounds

Set innodbsnapshotisolation to ON (default in MariaDB >= 11.6.2, e.g packaged in Debian 13).

Resources

https://mariadb.com/resources/blog/isolation-level-violation-testing-and-debugging-in-mariadb/

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-18T15:36:18Z",
    "nvd_published_at": null,
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-285"
    ]
}

References

Affected packages

PyPI / edumfa

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.9.1

Affected versions

1.*

1.2.0

1.3.0

1.4.0

1.5.0

1.5.1

2.*

2.0.0

2.0.1

2.0.2

2.0.3

2.1.0

2.2.0

2.3.0

2.4.0

2.5.0

2.6.0

2.6.1

2.7.0

2.7.1

2.7.2

2.8.0

2.9.0rc1

2.9.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qq2p-4282-cfc5/GHSA-qq2p-4282-cfc5.json"