Heap-based Buffer Overflow Affecting nginx-mod-devel package, versions <1:1.24.0-3.module+el8.10.0+24380+8b0811ed.2


Severity

Recommended
0.0
high
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
2.7% (86th percentile)

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  • Snyk IDSNYK-CENTOS8-NGINXMODDEVEL-16878751
  • published26 May 2026
  • disclosed22 May 2026

Introduced: 22 May 2026

CVE-2026-9256  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Centos:8 nginx-mod-devel to version 1:1.24.0-3.module+el8.10.0+24380+8b0811ed.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nginx-mod-devel package and not the nginx-mod-devel package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Base Scores

version 3.1