CVE-2026-9256

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Source
https://cve.org/CVERecord?id=CVE-2026-9256
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9256.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-9256
Aliases
Downstream
Related
Published
2026-05-22T15:16:27.073Z
Modified
2026-08-13T04:01:14.773237416Z
Severity
  • 9.2 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
[none]
Details

NGINX Plus and NGINX Open Source have a vulnerability in the ngxhttprewrite_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.

Database specific 
{
    "unresolved_ranges": [
        {
            "vendor_product": "f5:dos",
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "4.3.0"
                },
                {
                    "last_affected": "4.7.0"
                }
            ]
        },
        {
            "vendor_product": "f5:nginx_ingress_controller",
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "3.5.0"
                },
                {
                    "last_affected": "3.7.2"
                },
                {
                    "introduced": "4.0.0"
                },
                {
                    "last_affected": "4.0.1"
                },
                {
                    "introduced": "5.0.0"
                },
                {
                    "fixed": "5.4.3"
                }
            ]
        },
        {
            "vendor_product": "f5:nginx_instance_manager",
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "2.17.0"
                },
                {
                    "fixed": "2.22.1"
                }
            ]
        },
        {
            "vendor_product": "f5:nginx_plus",
            "source": "CPE_RANGE",
            "extracted_events": [
                {
                    "introduced": "r33"
                },
                {
                    "fixed": "r36"
                }
            ],
            "cpes": [
                "cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*"
            ]
        },
        {
            "vendor_product": "f5:waf",
            "source": "CPE_RANGE",
            "extracted_events": [
                {
                    "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"
                }
            ],
            "cpes": [
                "cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*"
            ]
        },
        {
            "vendor_product": "redhat:update_infrastructure",
            "source": "CPE_RANGE",
            "cpes": [
                "cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "5.0"
                },
                {
                    "fixed": "5.2"
                }
            ]
        },
        {
            "vendor_product": "debian:debian_linux",
            "source": "CPE_STRING",
            "cpes": [
                "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "11.0"
                },
                {
                    "last_affected": "11.0"
                }
            ]
        },
        {
            "vendor_product": "f5:dos",
            "source": "CPE_STRING",
            "extracted_events": [
                {
                    "introduced": "4.9.0"
                },
                {
                    "last_affected": "4.9.0"
                }
            ],
            "cpes": [
                "cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*"
            ]
        },
        {
            "vendor_product": "f5:nginx_plus",
            "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:*:*:*"
            ],
            "extracted_events": [
                {
                    "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"
                }
            ]
        },
        {
            "vendor_product": "redhat:enterprise_linux",
            "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:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
                {
                    "introduced": "8.0"
                },
                {
                    "last_affected": "8.0"
                },
                {
                    "introduced": "9.0"
                },
                {
                    "last_affected": "9.0"
                },
                {
                    "introduced": "10.0"
                },
                {
                    "last_affected": "10.0"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/nginx/nginx

Affected ranges

Type
GIT
Repo
https://github.com/nginx/nginx
Events
Introduced
805d9db723e74bbe84e6df1be29fda28abcc23ea
Last affected
955370fc8c12b1a945941f844adc9df49a0f3f32
Introduced
a2a09a84eb0a7059880500e70b40796ab1dd0c4d
Fixed
a92a537860c7b87d3793d9eb41c9cf3ed833b53c
Introduced
e8053c867f9ab14f323e3019ccab585d857abb66
Last affected
e8053c867f9ab14f323e3019ccab585d857abb66
Database specific
Show details 
{
    "source": [
        "CPE_RANGE",
        "CPE_STRING"
    ],
    "cpe": [
        "cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*",
        "cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "0.1.17"
        },
        {
            "last_affected": "0.9.7"
        },
        {
            "introduced": "1.0.0"
        },
        {
            "fixed": "1.30.2"
        },
        {
            "introduced": "1.31.0"
        },
        {
            "last_affected": "1.31.0"
        }
    ]
}

Affected versions

1.*
1.31.0
release-0.*
release-0.1.17
release-0.1.18
release-0.1.19
release-0.1.20
release-0.1.21
release-0.1.22
release-0.1.23
release-0.1.24
release-0.1.25
release-0.1.26
release-0.1.27
release-0.1.28
release-0.1.29
release-0.1.30
release-0.1.31
release-0.1.32
release-0.1.33
release-0.1.34
release-0.1.35
release-0.1.36
release-0.1.37
release-0.1.38
release-0.1.39
release-0.1.40
release-0.1.41
release-0.1.42
release-0.1.43
release-0.1.44
release-0.1.45
release-0.2.0
release-0.2.1
release-0.2.2
release-0.2.3
release-0.2.4
release-0.2.5
release-0.2.6
release-0.3.0
release-0.3.1
release-0.3.10
release-0.3.11
release-0.3.12
release-0.3.13
release-0.3.14
release-0.3.15
release-0.3.16
release-0.3.17
release-0.3.18
release-0.3.19
release-0.3.2
release-0.3.20
release-0.3.21
release-0.3.22
release-0.3.23
release-0.3.24
release-0.3.25
release-0.3.26
release-0.3.27
release-0.3.28
release-0.3.29
release-0.3.3
release-0.3.30
release-0.3.31
release-0.3.32
release-0.3.33
release-0.3.34
release-0.3.35
release-0.3.36
release-0.3.37
release-0.3.38
release-0.3.39
release-0.3.4
release-0.3.40
release-0.3.41
release-0.3.42
release-0.3.43
release-0.3.44
release-0.3.45
release-0.3.46
release-0.3.47
release-0.3.48
release-0.3.49
release-0.3.5
release-0.3.50
release-0.3.51
release-0.3.52
release-0.3.53
release-0.3.54
release-0.3.55
release-0.3.56
release-0.3.57
release-0.3.58
release-0.3.59
release-0.3.6
release-0.3.60
release-0.3.61
release-0.3.7
release-0.3.8
release-0.3.9
release-0.4.0
release-0.4.1
release-0.4.10
release-0.4.11
release-0.4.12
release-0.4.13
release-0.4.14
release-0.4.2
release-0.4.3
release-0.4.4
release-0.4.5
release-0.4.6
release-0.4.7
release-0.4.8
release-0.4.9
release-0.5.0
release-0.5.1
release-0.5.10
release-0.5.11
release-0.5.12
release-0.5.13
release-0.5.14
release-0.5.15
release-0.5.16
release-0.5.17
release-0.5.18
release-0.5.19
release-0.5.2
release-0.5.20
release-0.5.21
release-0.5.22
release-0.5.23
release-0.5.24
release-0.5.25
release-0.5.3
release-0.5.4
release-0.5.5
release-0.5.6
release-0.5.7
release-0.5.8
release-0.5.9
release-0.6.0
release-0.6.1
release-0.6.10
release-0.6.11
release-0.6.12
release-0.6.13
release-0.6.14
release-0.6.15
release-0.6.16
release-0.6.17
release-0.6.18
release-0.6.19
release-0.6.2
release-0.6.20
release-0.6.21
release-0.6.22
release-0.6.23
release-0.6.24
release-0.6.25
release-0.6.26
release-0.6.27
release-0.6.28
release-0.6.29
release-0.6.3
release-0.6.30
release-0.6.31
release-0.6.4
release-0.6.5
release-0.6.6
release-0.6.7
release-0.6.8
release-0.6.9
release-0.7.0
release-0.7.1
release-0.7.10
release-0.7.11
release-0.7.12
release-0.7.13
release-0.7.14
release-0.7.15
release-0.7.16
release-0.7.17
release-0.7.18
release-0.7.19
release-0.7.2
release-0.7.20
release-0.7.21
release-0.7.22
release-0.7.23
release-0.7.24
release-0.7.25
release-0.7.26
release-0.7.27
release-0.7.28
release-0.7.29
release-0.7.3
release-0.7.30
release-0.7.31
release-0.7.32
release-0.7.33
release-0.7.34
release-0.7.35
release-0.7.36
release-0.7.37
release-0.7.38
release-0.7.39
release-0.7.4
release-0.7.40
release-0.7.41
release-0.7.42
release-0.7.43
release-0.7.44
release-0.7.45
release-0.7.46
release-0.7.47
release-0.7.48
release-0.7.49
release-0.7.5
release-0.7.50
release-0.7.51
release-0.7.52
release-0.7.53
release-0.7.54
release-0.7.55
release-0.7.56
release-0.7.57
release-0.7.58
release-0.7.59
release-0.7.6
release-0.7.7
release-0.7.8
release-0.7.9
release-0.8.0
release-0.8.1
release-0.8.10
release-0.8.11
release-0.8.12
release-0.8.13
release-0.8.14
release-0.8.15
release-0.8.16
release-0.8.17
release-0.8.18
release-0.8.19
release-0.8.2
release-0.8.20
release-0.8.21
release-0.8.22
release-0.8.23
release-0.8.24
release-0.8.25
release-0.8.26
release-0.8.27
release-0.8.28
release-0.8.29
release-0.8.3
release-0.8.30
release-0.8.31
release-0.8.32
release-0.8.33
release-0.8.34
release-0.8.35
release-0.8.36
release-0.8.37
release-0.8.38
release-0.8.39
release-0.8.4
release-0.8.40
release-0.8.41
release-0.8.42
release-0.8.43
release-0.8.44
release-0.8.45
release-0.8.46
release-0.8.47
release-0.8.48
release-0.8.49
release-0.8.5
release-0.8.50
release-0.8.51
release-0.8.52
release-0.8.53
release-0.8.6
release-0.8.7
release-0.8.8
release-0.8.9
release-0.9.0
release-0.9.1
release-0.9.2
release-0.9.3
release-0.9.4
release-0.9.5
release-0.9.6
release-0.9.7
release-1.*
release-1.0.0
release-1.0.1
release-1.0.2
release-1.0.3
release-1.0.4
release-1.0.5
release-1.1.0
release-1.1.1
release-1.1.10
release-1.1.11
release-1.1.12
release-1.1.13
release-1.1.14
release-1.1.15
release-1.1.16
release-1.1.17
release-1.1.18
release-1.1.19
release-1.1.2
release-1.1.3
release-1.1.4
release-1.1.5
release-1.1.6
release-1.1.7
release-1.1.8
release-1.1.9
release-1.11.0
release-1.11.1
release-1.11.10
release-1.11.11
release-1.11.12
release-1.11.13
release-1.11.2
release-1.11.3
release-1.11.4
release-1.11.5
release-1.11.6
release-1.11.7
release-1.11.8
release-1.11.9
release-1.13.0
release-1.13.1
release-1.13.10
release-1.13.11
release-1.13.12
release-1.13.2
release-1.13.3
release-1.13.4
release-1.13.5
release-1.13.6
release-1.13.7
release-1.13.8
release-1.13.9
release-1.15.0
release-1.15.1
release-1.15.10
release-1.15.11
release-1.15.12
release-1.15.2
release-1.15.3
release-1.15.4
release-1.15.5
release-1.15.6
release-1.15.7
release-1.15.8
release-1.15.9
release-1.17.0
release-1.17.1
release-1.17.10
release-1.17.2
release-1.17.3
release-1.17.4
release-1.17.5
release-1.17.6
release-1.17.7
release-1.17.8
release-1.17.9
release-1.19.0
release-1.19.1
release-1.19.10
release-1.19.2
release-1.19.3
release-1.19.4
release-1.19.5
release-1.19.6
release-1.19.7
release-1.19.8
release-1.19.9
release-1.2.0
release-1.21.0
release-1.21.1
release-1.21.2
release-1.21.3
release-1.21.4
release-1.21.5
release-1.21.6
release-1.23.0
release-1.23.1
release-1.23.2
release-1.23.3
release-1.23.4
release-1.25.0
release-1.25.1
release-1.25.2
release-1.25.3
release-1.25.4
release-1.25.5
release-1.27.0
release-1.27.1
release-1.27.2
release-1.27.3
release-1.27.4
release-1.27.5
release-1.29.0
release-1.29.1
release-1.29.2
release-1.29.3
release-1.29.4
release-1.29.5
release-1.29.6
release-1.29.7
release-1.29.8
release-1.3.0
release-1.3.1
release-1.3.10
release-1.3.11
release-1.3.12
release-1.3.13
release-1.3.14
release-1.3.15
release-1.3.16
release-1.3.2
release-1.3.3
release-1.3.4
release-1.3.5
release-1.3.6
release-1.3.7
release-1.3.8
release-1.3.9
release-1.30.0
release-1.30.1
release-1.31.0
release-1.4.0
release-1.5.0
release-1.5.1
release-1.5.10
release-1.5.11
release-1.5.12
release-1.5.13
release-1.5.2
release-1.5.3
release-1.5.4
release-1.5.5
release-1.5.6
release-1.5.7
release-1.5.8
release-1.5.9
release-1.7.0
release-1.7.1
release-1.7.10
release-1.7.11
release-1.7.12
release-1.7.2
release-1.7.3
release-1.7.4
release-1.7.5
release-1.7.6
release-1.7.7
release-1.7.8
release-1.7.9
release-1.9.0
release-1.9.1
release-1.9.10
release-1.9.11
release-1.9.12
release-1.9.13
release-1.9.14
release-1.9.15
release-1.9.2
release-1.9.3
release-1.9.4
release-1.9.5
release-1.9.6
release-1.9.7
release-1.9.8
release-1.9.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9256.json"

Git / github.com/nginx/nginx-gateway-fabric

Affected ranges

Type
GIT
Repo
https://github.com/nginx/nginx-gateway-fabric
Events
Introduced
3a372747333fb1db372af7cf0b18ed7eef7c91f7
Last affected
532db6a20b2912fe397211eef9f8d564d46a4bdd
Introduced
7dad8b31e3f0c3eadce36fed8c276e83e6583d24
Fixed
dda57a2d256e8e1aa425c7ae715c2861e2e4b239
Database specific
Show details 
{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.3.0"
        },
        {
            "last_affected": "1.6.2"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.6.2"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9256.json"