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TI-2026-08132 Aliases CVE-2026-9256GHSA-h78r-86c6-jgp4

NGINX ngx_http_rewrite_module vulnerability

Priority MEDIUM 55CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 12 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.10856 95th percentileScored 2026-11-07
Fix Partial NGINX Plus (F5): 37.0.1.1, R36 P5, R32 P7NGINX Open Source (F5): 1.31.1, 1.30.2Red Hat: 12 advisoriesRed Hat: 12 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
F5NGINX Plus37.0 to before 37.0.1.1; R36 to before R36 P5; R32 to before R32 P737.0.1.1, R36 P5, R32 P7Patch availableCNA
F5NGINX Open Source1.31.0 to before 1.31.1; 1.30.0 to before 1.30.2; 0.1.17 – 0.9.71.31.1, 1.30.2Patch availableCNA
  • NGINX Plus VendorF5 Affected 37.0 to before 37.0.1.1; R36 to before R36 P5; R32 to before R32 P7 Fixed in 37.0.1.1, R36 P5, R32 P7 Patch available CNA
  • NGINX Open Source VendorF5 Affected 1.31.0 to before 1.31.1; 1.30.0 to before 1.30.2; 0.1.17 – 0.9.7 Fixed in 1.31.1, 1.30.2 Patch available CNA

CPE configurations NVD · 29

CPEVersionsRoleVendor
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*0.1.17 – 0.9.7; 1.0.0 to before 1.30.2VulnerableF5
cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:*1.31.0VulnerableF5
cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:*r33 to before r36VulnerableF5
cpe:2.3:a:f5:nginx_plus:37.0.0.1:*:*:*:long-term_support:*:*:*37.0.0.1VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:-:*:*:continuous_releases:*:*:*r32VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:continuous_releases:*:*:*r32 p1VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:continuous_releases:*:*:*r32 p2VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:continuous_releases:*:*:*r32 p3VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:continuous_releases:*:*:*r32 p4VulnerableF5
cpe:2.3:a:f5:nginx_plus:r32:p5:*:*:continuous_releases:*:*:*r32 p5VulnerableF5
  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* Versions 0.1.17 – 0.9.7; 1.0.0 to before 1.30.2 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_open_source:1.31.0:*:*:*:*:*:*:* Versions 1.31.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:*:*:*:*:continuous_releases:*:*:* Versions r33 to before r36 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:37.0.0.1:*:*:*:long-term_support:*:*:* Versions 37.0.0.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:-:*:*:continuous_releases:*:*:* Versions r32 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:continuous_releases:*:*:* Versions r32 p1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:continuous_releases:*:*:* Versions r32 p2 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:continuous_releases:*:*:* Versions r32 p3 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:continuous_releases:*:*:* Versions r32 p4 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r32:p5:*:*:continuous_releases:*:*:* Versions r32 p5 Vulnerable ·F5
Show 19 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:f5:nginx_plus:r32:p6:*:*:continuous_releases:*:*:*r32 p6VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:*r36VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:*r36 p1VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:*r36 p2VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:*r36 p3VulnerableF5
cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:*r36 p4VulnerableF5
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*4.3.0 – 4.7.0VulnerableF5
cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:*4.9.0VulnerableF5
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*1.3.0 – 1.6.2; 2.0.0 to before 2.6.2VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 to before 5.4.3VulnerableF5
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*2.17.0 to before 2.22.1VulnerableF5
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*4.10.0 – 4.16.0; 5.2.0 – 5.8.0; 5.9.0 – 5.13.0VulnerableF5
cpe:2.3:a:redhat:discovery:-:*:*:*:*:*:*:*not specified by NVDVulnerableRed Hat
cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:*not specified by NVDVulnerableRed Hat
cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:*5.0 to before 5.2VulnerableRed Hat
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*10.0VulnerableRed Hat
  • cpe:2.3:a:f5:nginx_plus:r32:p6:*:*:continuous_releases:*:*:* Versions r32 p6 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:-:*:*:continuous_releases:*:*:* Versions r36 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:continuous_releases:*:*:* Versions r36 p1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:continuous_releases:*:*:* Versions r36 p2 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p3:*:*:continuous_releases:*:*:* Versions r36 p3 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:r36:p4:*:*:continuous_releases:*:*:* Versions r36 p4 Vulnerable ·F5
  • cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* Versions 4.3.0 – 4.7.0 Vulnerable ·F5
  • cpe:2.3:a:f5:dos:4.9.0:*:*:*:*:nginx:*:* Versions 4.9.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* Versions 1.3.0 – 1.6.2; 2.0.0 to before 2.6.2 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:* Versions 3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 to before 5.4.3 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* Versions 2.17.0 to before 2.22.1 Vulnerable ·F5
  • cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* Versions 4.10.0 – 4.16.0; 5.2.0 – 5.8.0; 5.9.0 – 5.13.0 Vulnerable ·F5
  • cpe:2.3:a:redhat:discovery:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:hardened_images:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:update_infrastructure:*:*:*:*:*:*:*:* Versions 5.0 to before 5.2 Vulnerable ·Red Hat
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA NGINX Plus (F5) Fixed in 37.0.1.1, R36 P5, R32 P7
  • Fix · CNA NGINX Open Source (F5) Fixed in 1.31.1, 1.30.2

Red Hat 12 advisories

  • RHSA-2026:93467 Released 2026-11-02 · Red Hat rating Important
    nginx security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) nginx-mod-devel-2:1.20.1-22.el9_6.7
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx-2:1.20.1-22.el9_6.7, nginx-all-modules-2:1.20.1-22.el9_6.7, nginx-core-2:1.20.1-22.el9_6.7 +6
  • RHSA-2026:93468 Released 2026-11-02 · Red Hat rating Important
    nginx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) nginx-1:1.20.1-16.el9_4.7, nginx-all-modules-1:1.20.1-16.el9_4.7, nginx-core-1:1.20.1-16.el9_4.7 +6
  • RHSA-2026:93472 Released 2026-11-02 · Red Hat rating Important
    nginx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) nginx-1:1.20.1-14.el9_2.7, nginx-all-modules-1:1.20.1-14.el9_2.7, nginx-core-1:1.20.1-14.el9_2.7 +6
Show 9 more Red Hat advisories
  • RHSA-2026:58981 Released 2026-08-24 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.3 Technology Preview security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-tp-rhel9, registry.redhat.io/rhui5/installer-tp-rhel9, registry.redhat.io/rhui5/rhua-tp-rhel9
  • RHSA-2026:44481 Released 2026-07-23 · Red Hat rating Important
    Red Hat Update Infrastructure 5.2 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-kubernetes-rhel9, registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9 +2
  • RHSA-2026:33313 Released 2026-06-29 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:29874 Released 2026-06-25 · Red Hat rating Important
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 10) nginx-2:1.26.3-6.el10_2.4, nginx-all-modules-2:1.26.3-6.el10_2.4, nginx-core-2:1.26.3-6.el10_2.4 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nginx-mod-devel-2:1.26.3-6.el10_2.4
  • RHSA-2026:29151 Released 2026-06-25 · Red Hat rating Important
    nginx:1.26 security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.aarch64::nginx:1.26, nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.ppc64le::nginx:1.26, nginx-2:1.26.3-9.module+el9.8.0+24374+c0e15309.1.s390x::nginx:1.26 +32
  • RHSA-2026:28973 Released 2026-06-24 · Red Hat rating Important
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-2:1.20.1-28.el9_8.3, nginx-all-modules-2:1.20.1-28.el9_8.3, nginx-core-2:1.20.1-28.el9_8.3 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nginx-mod-devel-2:1.20.1-28.el9_8.3
  • RHSA-2026:28921 Released 2026-06-24 · Red Hat rating Important
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream (v. 8) nginx-1:1.24.0-3.module+el8.10.0+24380+8b0811ed.2.aarch64::nginx:1.24, nginx-1:1.24.0-3.module+el8.10.0+24380+8b0811ed.2.ppc64le::nginx:1.24, nginx-1:1.24.0-3.module+el8.10.0+24380+8b0811ed.2.s390x::nginx:1.24 +28
  • RHSA-2026:28212 Released 2026-06-23 · Red Hat rating Important
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-1:1.24.0-7.module+el9.8.0+24379+0344c460.2.aarch64::nginx:1.24, nginx-1:1.24.0-7.module+el9.8.0+24379+0344c460.2.ppc64le::nginx:1.24, nginx-1:1.24.0-7.module+el9.8.0+24379+0344c460.2.s390x::nginx:1.24 +32
  • RHSA-2026:20351 Released 2026-05-23 · Red Hat rating Important
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nginx-1.30.2-1.hum1@aarch64, nginx-1.30.2-1.hum1@src, nginx-1.30.2-1.hum1@x86_64 +22

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Lightspeed proxy 1AffectedNo fix yet
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:93467
Red Hat Discovery 2Fixed RHSA-2026:33313
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:29874
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:28921
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:28212, RHSA-2026:28973, RHSA-2026:29151
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:93472
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:93468
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:93467
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:29874
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:28973
Red Hat Hardened ImagesFixed RHSA-2026:20351
Red Hat Update Infrastructure 5Fixed RHSA-2026:44481, RHSA-2026:58981
Not affected: 2 products
  • Red Hat Discovery 2
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-9256
  2. 2026-10-03 Alias added: GHSA-h78r-86c6-jgp4
  3. 2026-10-25 EPSS moved to the 95th–99th percentile
  4. 2026-11-02 Fix available: RHSA-2026:93468 · Red Hat
  5. 2026-11-02 Fix available: RHSA-2026:93472 · Red Hat
  6. 2026-11-02 Fix available: RHSA-2026:93467 · Red Hat
  7. 2026-11-02 Fix available: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux AppStream E4S (v.9.4) +1 · Red Hat

References

Advisory 13

  • TI-2026-31136 NGINX ngx_http_rewrite_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-30432 NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability CVSS 4.0CRITICAL 9.2
  • TI-2026-31137 NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability CVSS 4.0HIGH 8.3
  • TI-2026-29212 NGINX ngx_quic_module vulnerability CVSS 4.0MEDIUM 6.9
  • TI-2026-35579 NGINX ngx_http_charset_module vulnerability CVSS 4.0MEDIUM 6.3
  • TI-2026-31131 NGINX ngx_http_charset_module vulnerability CVSS 4.0MEDIUM 6.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences