9.2

CVE-2026-9256

Medienbericht

NGINX ngx_http_rewrite_module vulnerability

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
F5 ≫ Nginx Open Source Version >= 0.1.17 <= 0.9.7
F5 ≫ Nginx Open Source Version >= 1.0.0 <= 1.30.1
F5 ≫ Nginx Open Source Version1.31.0
F5 ≫ Nginx Plus Version >= 37.0.0 < 37.0.1.1
F5 ≫ Nginx Plus Version >= r32 <= r36
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 4.26% 0.898
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
f5sirt@f5.com 9.2 0 0
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
f5sirt@f5.com 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
0b0ca135-0b70-47e7-9f44-1890c2a1c46c 8.1 2.2 5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE-122 Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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VulnDex Intel
Media Report
05.06.2026 12:45
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VulnDex Intel
Media Report
05.06.2026 12:44
https://my.f5.com/manage/s/article/K000161377
Vendor Advisory
Mitigation
http://www.openwall.com/lists/oss-security/2026/05/22/14
Third Party Advisory
Mailing List
https://access.redhat.com/errata/RHSA-2026:33313
https://lists.debian.org/debian-lts-announce/2026/06/msg00023.html
https://access.redhat.com/errata/RHSA-2026:20351
https://access.redhat.com/errata/RHSA-2026:28212
https://access.redhat.com/errata/RHSA-2026:28921
https://access.redhat.com/errata/RHSA-2026:28973
https://access.redhat.com/errata/RHSA-2026:29151
https://access.redhat.com/errata/RHSA-2026:29874
https://access.redhat.com/security/cve/CVE-2026-9256
https://bugzilla.redhat.com/show_bug.cgi?id=2480746
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9256.json