Integer Overflow or Wraparound Affecting httpd:2.4/mod_ssl package, versions <1:2.4.37-65.module_el8.10.0+4088+57f011c1.7


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.42% (34th percentile)

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  • Snyk IDSNYK-ALMALINUX8-HTTPD-14551166
  • published23 Dec 2025
  • disclosed22 Dec 2025

Introduced: 22 Dec 2025

CVE-2025-55753  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 httpd:2.4/mod_ssl to version 1:2.4.37-65.module_el8.10.0+4088+57f011c1.7 or higher.
This issue was patched in ALSA-2025:23732.

NVD Description

Note: Versions mentioned in the description apply only to the upstream httpd:2.4/mod_ssl package and not the httpd:2.4/mod_ssl package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

An integer overflow in the case of failed ACME certificate renewal leads, after a number of failures (~30 days in default configurations), to the backoff timer becoming 0. Attempts to renew the certificate then are repeated without delays until it succeeds.

This issue affects Apache HTTP Server: from 2.4.30 before 2.4.66.

Users are recommended to upgrade to version 2.4.66, which fixes the issue.

CVSS Base Scores

version 3.1