cve-2026-42945
CRITICAL CVSS 9.2 nvd
Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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.
Timeline
- Published
- 2026-05-13
- Last Modified
- 2026-09-10
CVSS Details
- Attack Vector
- NETWORK
- Attack Complexity
- HIGH
- Privileges Required
- NONE
Affected Products
- f5 dos
- f5 nginx_gateway_fabric
- f5 nginx_ingress_controller
- f5 nginx_instance_manager
- f5 nginx_open_source
- f5 nginx_plus
- f5 waf
CVSS metrics
| Version | Base | Severity | Vector | Exploitability | Impact | Source |
|---|---|---|---|---|---|---|
| 4.0 | 9.2 | CRITICAL | CVSS:4.0/AV:N/AC:H/AT:N/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 | ||
| 3.1 | 8.1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2 | 5.9 | f5sirt@f5.com |
| 3.1 | 8.1 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2 | 5.9 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
CPE configurations
OR
| CPE | Version range | Vulnerable |
|---|---|---|
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* |
>= 4.3.0, <= 4.7.0 | yes |
cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:* |
— | yes |
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* |
>= 1.3.0, <= 1.6.2 | yes |
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* |
>= 2.0.0, <= 2.5.1 | yes |
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* |
>= 3.5.0, <= 3.7.2 | yes |
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* |
>= 4.0.0, <= 4.0.1 | yes |
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* |
>= 5.0.0, <= 5.4.1 | yes |
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* |
>= 2.16.0, <= 2.21.1 | yes |
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* |
>= 0.6.27, <= 1.30.0 | yes |
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* |
>= r32, <= r36 | yes |
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* |
>= 4.9.0, <= 4.16.0 | yes |
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* |
>= 5.1.0, <= 5.8.0 | yes |
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* |
>= 5.9.0, <= 5.12.1 | yes |
NVD metadata
- NVD status
- Modified
- Source identifier
f5sirt@f5.com
References
- https://my.f5.com/manage/s/article/K000161019 Mitigation, Vendor Advisory
- https://depthfirst.com/nginx-rift Mitigation, Technical Description, Third Party Advisory
- https://github.com/DepthFirstDisclosures/Nginx-Rift Exploit, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2026:17417
- https://access.redhat.com/errata/RHSA-2026:17751
- https://access.redhat.com/errata/RHSA-2026:17752
- https://access.redhat.com/errata/RHSA-2026:17753
- https://access.redhat.com/errata/RHSA-2026:17790
- https://access.redhat.com/errata/RHSA-2026:17791
- https://access.redhat.com/errata/RHSA-2026:17792
- https://access.redhat.com/errata/RHSA-2026:17793
- https://access.redhat.com/errata/RHSA-2026:17794
- https://access.redhat.com/errata/RHSA-2026:18029
- https://access.redhat.com/errata/RHSA-2026:18041
- https://access.redhat.com/errata/RHSA-2026:18063
- https://access.redhat.com/errata/RHSA-2026:19159
- https://access.redhat.com/errata/RHSA-2026:19371
- https://access.redhat.com/errata/RHSA-2026:19372
- https://access.redhat.com/errata/RHSA-2026:19374
- https://access.redhat.com/errata/RHSA-2026:20442
- https://access.redhat.com/errata/RHSA-2026:20444
- https://access.redhat.com/errata/RHSA-2026:21275
- https://access.redhat.com/errata/RHSA-2026:22382
- https://access.redhat.com/errata/RHSA-2026:22383
- https://access.redhat.com/errata/RHSA-2026:22388
- https://access.redhat.com/errata/RHSA-2026:22389
- https://access.redhat.com/errata/RHSA-2026:22390
- https://access.redhat.com/errata/RHSA-2026:22393
- https://access.redhat.com/errata/RHSA-2026:22394
- https://access.redhat.com/errata/RHSA-2026:22396
- https://access.redhat.com/errata/RHSA-2026:58981
- https://access.redhat.com/security/cve/CVE-2026-42945
- https://bugzilla.redhat.com/show_bug.cgi?id=2477116
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42945.json
Linked Vulnerabilities
{
"cvss": 9.2,
"datePublished": "2026-05-13T16:16:50.190",
"dateUpdated": "2026-09-10T13:20:09.723",
"description": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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.",
"id": "CVE-2026-42945",
"raw": {
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],
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"version": "R37",
"versionType": "custom"
},
{
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"status": "affected",
"version": "R36",
"versionType": "custom"
},
{
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"version": "R32",
"versionType": "custom"
}
]
},
{
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"modules": [
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],
"product": "NGINX Open Source",
"vendor": "F5",
"versions": [
{
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"status": "unaffected",
"version": "1.31.0",
"versionType": "semver"
},
{
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"status": "affected",
"version": "0.6.27",
"versionType": "semver"
}
]
}
],
"source": "f5sirt@f5.com"
},
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"type": "Secondary"
}
]
},
"severity": "CRITICAL",
"source": "nvd",
"title": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module"
}