Critical
Security advisory
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$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-9256
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 06:24 UTC · Revision 1
Source evidence
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) 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.
osv:CVE-2026-9256
Complete source record
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"https://access.redhat.com/errata/RHSA-2026:44481",
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"https://access.redhat.com/security/cve/CVE-2026-9256",
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"https://my.f5.com/manage/s/article/K000161377",
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9256.json",
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},
{
"last_affected": "4.0.1"
},
{
"introduced": "5.0.0"
},
{
"fixed": "5.4.3"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*"
],
"vendor_product": "f5:nginx_instance_manager",
"extracted_events": [
{
"range": [
{
"introduced": "2.17.0"
},
{
"fixed": "2.22.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*"
],
"vendor_product": "f5:nginx_plus",
"extracted_events": [
{
"range": [
{
"introduced": "r33"
},
{
"fixed": "r36"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*"
],
"vendor_product": "f5:waf",
"extracted_events": [
{
"range": [
{
"introduced": "4.10.0"
},
{
"last_affected": "4.16.0"
},
{
"introduced": "5.2.0"
},
{
"last_affected": "5.8.0"
},
{
"introduced": "5.9.0"
},
{
"last_affected": "5.13.0"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:update_infrastructure",
"extracted_events": [
{
"range": [
{
"introduced": "5.0"
},
{
"fixed": "5.2"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "11.0"
},
{
"last_affected": "11.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*"
],
"vendor_product": "f5:dos",
"extracted_events": [
{
"range": [
{
"introduced": "4.9.0"
},
{
"last_affected": "4.9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:f5:nginx_plus:37.0.0.1:*:*:*:long-term_support:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:-:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p5:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r32:p6:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*",
"cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*"
],
"vendor_product": "f5:nginx_plus",
"extracted_events": [
{
"range": [
{
"introduced": "37.0.0.1"
},
{
"last_affected": "37.0.0.1"
},
{
"introduced": "r32-NA"
},
{
"last_affected": "r32-NA"
},
{
"introduced": "r32-p1"
},
{
"last_affected": "r32-p1"
},
{
"introduced": "r32-p2"
},
{
"last_affected": "r32-p2"
},
{
"introduced": "r32-p3"
},
{
"last_affected": "r32-p3"
},
{
"introduced": "r32-p4"
},
{
"last_affected": "r32-p4"
},
{
"introduced": "r32-p5"
},
{
"last_affected": "r32-p5"
},
{
"introduced": "r32-p6"
},
{
"last_affected": "r32-p6"
},
{
"introduced": "r36-NA"
},
{
"last_affected": "r36-NA"
},
{
"introduced": "r36-p1"
},
{
"last_affected": "r36-p1"
},
{
"introduced": "r36-p2"
},
{
"last_affected": "r36-p2"
},
{
"introduced": "r36-p3"
},
{
"last_affected": "r36-p3"
},
{
"introduced": "r36-p4"
},
{
"last_affected": "r36-p4"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
},
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
},
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2026-9256",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 434560,
"published_at": "2026-05-22T15:16:27.073+00:00"
}