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Vulnerability record · CVE-2022-48566 · published 22 August 2023

CVE-2022-48566: Python race condition vulnerability

Python · Python

An issue was discovered in compare_digest in Lib/hmac.py in Python through 3.9.1. Constant-time-defeating optimisations were possible in the accumulator variable in hmac.compare_digest.

5.9 CVSS 3.1 Medium EPSS 1.3% · top 29.1% CWE-362 · Race condition
5.9CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An issue was discovered in compare_digest in Lib/hmac.py in Python through 3.9.1. Constant-time-defeating optimisations were possible in the accumulator variable in hmac.compare_digest.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.python.org/issue40791 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00022.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00017.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231006-0013/ Third Party Advisory
https://bugs.python.org/issue40791 ExploitIssue TrackingPatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2023/09/msg00022.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00017.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20231006-0013/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-48566), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.