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TI-2026-31136 Aliases CVE-2026-42945GHSA-gcgv-v5gf-c543

NGINX ngx_http_rewrite_module vulnerability

Priority HIGH 78CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

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 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.68047 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed NGINX Plus (F5): R37, R36 P4, R32 P6NGINX Open Source (F5): 1.31.0, 1.30.1Red Hat: 28 advisories

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 PlusR36 to before R36 P4; R32 to before R32 P6R37, R36 P4, R32 P6Patch availableCNA
F5NGINX Open Source0.6.27 to before 1.30.11.31.0, 1.30.1Patch availableCNA
  • NGINX Plus VendorF5 Affected R36 to before R36 P4; R32 to before R32 P6 Fixed in R37, R36 P4, R32 P6 Patch available CNA
  • NGINX Open Source VendorF5 Affected 0.6.27 to before 1.30.1 Fixed in 1.31.0, 1.30.1 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*4.3.0 – 4.7.0VulnerableF5
cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*4.8.0VulnerableF5
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*1.3.0 – 1.6.2; 2.0.0 – 2.5.1VulnerableF5
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 – 5.4.1VulnerableF5
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*2.16.0 – 2.21.1VulnerableF5
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*0.6.27 – 1.30.0VulnerableF5
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:*r32 – r36VulnerableF5
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:*4.9.0 – 4.16.0; 5.1.0 – 5.8.0; 5.9.0 – 5.12.1VulnerableF5
  • cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* Versions 4.3.0 – 4.7.0 Vulnerable ·F5
  • cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:* Versions 4.8.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* Versions 1.3.0 – 1.6.2; 2.0.0 – 2.5.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* Versions 3.5.0 – 3.7.2; 4.0.0 – 4.0.1; 5.0.0 – 5.4.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* Versions 2.16.0 – 2.21.1 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* Versions 0.6.27 – 1.30.0 Vulnerable ·F5
  • cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* Versions r32 – r36 Vulnerable ·F5
  • cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* Versions 4.9.0 – 4.16.0; 5.1.0 – 5.8.0; 5.9.0 – 5.12.1 Vulnerable ·F5

Remediation

  • Fix · CNA NGINX Plus (F5) Fixed in R37, R36 P4, R32 P6
  • Fix · CNA NGINX Open Source (F5) Fixed in 1.31.0, 1.30.1

Red Hat 28 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-2026:22396 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.14.33 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.14 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22394 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.16.29 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.16 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
Show 25 more Red Hat advisories
  • RHSA-2026:22393 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.15.29 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.15 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22390 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.17.27 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.17 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22389 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.19.18 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.19 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22388 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.18.23 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.18 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22383 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.20.13 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.20 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:22382 Released 2026-06-02 · Red Hat rating Critical
    Red Hat OpenShift Data Foundation 4.21.6 security, enhancement & bug fix update
    • Red Hat Openshift Data Foundation 4.21 registry.redhat.io/odf4/ocs-client-console-rhel9, registry.redhat.io/odf4/odf-console-rhel9, registry.redhat.io/odf4/odf-multicluster-console-rhel9
  • RHSA-2026:21275 Released 2026-05-27 · Red Hat rating Critical
    Red Hat Update Infrastructure 5.1 security update
    • Red Hat Update Infrastructure 5 registry.redhat.io/rhui5/cds-rhel9, registry.redhat.io/rhui5/haproxy-rhel9, registry.redhat.io/rhui5/installer-rhel9 +1
  • RHSA-2026:20444 Released 2026-05-25 · Red Hat rating Critical
    General availability of the satellite/iop-gateway-rhel9 container image
    • Red Hat Satellite 6.19 registry.redhat.io/satellite/iop-gateway-rhel9
  • RHSA-2026:20442 Released 2026-05-25 · Red Hat rating Critical
    General availability of the satellite/iop-gateway-rhel9 container image
    • Red Hat Satellite 6.18 registry.redhat.io/satellite/iop-gateway-rhel9
  • RHSA-2026:19374 Released 2026-05-19 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-2:1.20.1-28.el9_8.2, nginx-all-modules-2:1.20.1-28.el9_8.2, nginx-core-2:1.20.1-28.el9_8.2 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nginx-mod-devel-2:1.20.1-28.el9_8.2
  • RHSA-2026:19372 Released 2026-05-19 · Red Hat rating Critical
    nginx:1.26 security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-2:1.26.3-9.module+el9.8.0+24288+e2e6d896.aarch64::nginx:1.26, nginx-2:1.26.3-9.module+el9.8.0+24288+e2e6d896.ppc64le::nginx:1.26, nginx-2:1.26.3-9.module+el9.8.0+24288+e2e6d896.s390x::nginx:1.26 +32
  • RHSA-2026:19371 Released 2026-05-19 · Red Hat rating Critical
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-1:1.24.0-7.module+el9.8.0+24289+833e4c02.1.aarch64::nginx:1.24, nginx-1:1.24.0-7.module+el9.8.0+24289+833e4c02.1.ppc64le::nginx:1.24, nginx-1:1.24.0-7.module+el9.8.0+24289+833e4c02.1.s390x::nginx:1.24 +32
  • RHSA-2026:19159 Released 2026-05-19 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 10) nginx-2:1.26.3-6.el10_2.3, nginx-all-modules-2:1.26.3-6.el10_2.3, nginx-core-2:1.26.3-6.el10_2.3 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nginx-mod-devel-2:1.26.3-6.el10_2.3
  • RHSA-2026:18029 Released 2026-05-18 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 9) nginx-2:1.20.1-24.el9_7.3, nginx-all-modules-2:1.20.1-24.el9_7.3, nginx-core-2:1.20.1-24.el9_7.3 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nginx-mod-devel-2:1.20.1-24.el9_7.3
  • RHSA-2026:18063 Released 2026-05-18 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream (v. 10) nginx-2:1.26.3-2.el10_1.2, nginx-all-modules-2:1.26.3-2.el10_1.2, nginx-core-2:1.26.3-2.el10_1.2 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nginx-mod-devel-2:1.26.3-2.el10_1.2
  • RHSA-2026:18041 Released 2026-05-18 · Red Hat rating Critical
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream (v. 8) nginx-1:1.24.0-3.module+el8.10.0+24290+dc7f88b5.1.aarch64::nginx:1.24, nginx-1:1.24.0-3.module+el8.10.0+24290+dc7f88b5.1.ppc64le::nginx:1.24, nginx-1:1.24.0-3.module+el8.10.0+24290+dc7f88b5.1.s390x::nginx:1.24 +28
  • RHSA-2026:17792 Released 2026-05-15 · Red Hat rating Critical
    nginx security update
    • Red Hat CodeReady Linux Builder EUS (v.9.4) nginx-mod-devel-1:1.20.1-16.el9_4.6
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) nginx-1:1.20.1-16.el9_4.6, nginx-all-modules-1:1.20.1-16.el9_4.6, nginx-core-1:1.20.1-16.el9_4.6 +6
  • RHSA-2026:17794 Released 2026-05-15 · Red Hat rating Critical
    nginx security update
    • Red Hat CodeReady Linux Builder EUS (v.9.6) nginx-mod-devel-2:1.20.1-22.el9_6.6
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx-2:1.20.1-22.el9_6.6, nginx-all-modules-2:1.20.1-22.el9_6.6, nginx-core-2:1.20.1-22.el9_6.6 +6
  • RHSA-2026:17793 Released 2026-05-15 · Red Hat rating Critical
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.4) nginx-1:1.24.0-1.module+el9.4.0+24298+389e3815.5.aarch64::nginx:1.24, nginx-1:1.24.0-1.module+el9.4.0+24298+389e3815.5.ppc64le::nginx:1.24, nginx-1:1.24.0-1.module+el9.4.0+24298+389e3815.5.s390x::nginx:1.24 +32
  • RHSA-2026:17790 Released 2026-05-15 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) nginx-2:1.26.3-1.el10_0.9, nginx-all-modules-2:1.26.3-1.el10_0.9, nginx-core-2:1.26.3-1.el10_0.9 +6
    • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) nginx-mod-devel-2:1.26.3-1.el10_0.9
  • RHSA-2026:17791 Released 2026-05-15 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.0) nginx-1:1.20.1-10.el9_0.4, nginx-all-modules-1:1.20.1-10.el9_0.4, nginx-filesystem-1:1.20.1-10.el9_0.4 +5
  • RHSA-2026:17753 Released 2026-05-15 · Red Hat rating Critical
    nginx:1.26 security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx-2:1.26.3-1.module+el9.6.0+24296+87cb744c.3.aarch64::nginx:1.26, nginx-2:1.26.3-1.module+el9.6.0+24296+87cb744c.3.ppc64le::nginx:1.26, nginx-2:1.26.3-1.module+el9.6.0+24296+87cb744c.3.s390x::nginx:1.26 +32
  • RHSA-2026:17752 Released 2026-05-15 · Red Hat rating Critical
    nginx:1.24 security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx-1:1.24.0-4.module+el9.6.0+24297+b3b39a7f.3.aarch64::nginx:1.24, nginx-1:1.24.0-4.module+el9.6.0+24297+b3b39a7f.3.ppc64le::nginx:1.24, nginx-1:1.24.0-4.module+el9.6.0+24297+b3b39a7f.3.s390x::nginx:1.24 +32
  • RHSA-2026:17751 Released 2026-05-15 · Red Hat rating Critical
    nginx security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) nginx-1:1.20.1-14.el9_2.6, nginx-all-modules-1:1.20.1-14.el9_2.6, nginx-core-1:1.20.1-14.el9_2.6 +6
  • RHSA-2026:17417 Released 2026-05-14 · Red Hat rating Critical
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images nginx-1.30.1-1.hum1@aarch64, nginx-1.30.1-1.hum1@src, nginx-1.30.1-1.hum1@x86_64 +22

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    F5 NGINX Open Source 1.30.1

    6 records Highest priority Priority HIGH 1 HIGH, 5 LOW

    Other records, highest priority first

    • TI-2026-31137 NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerabilityPriority LOW 38
    • TI-2026-29212 NGINX ngx_quic_module vulnerabilityPriority LOW 37
    • TI-2026-31125 NGINX ngx_http_proxy_v2_module vulnerabilityPriority LOW 34
    Show all 6 records →
  • Release ·

    F5 NGINX Plus R32 P6, R36 P4

    5 records Highest priority Priority HIGH 1 HIGH, 4 LOW

    Other records, highest priority first

    • TI-2026-31137 NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerabilityPriority LOW 38
    • TI-2026-29212 NGINX ngx_quic_module vulnerabilityPriority LOW 37
    • TI-2026-31131 NGINX ngx_http_charset_module vulnerabilityPriority LOW 29
    Show all 5 records →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat CodeReady Linux Builder EUS (v.9.4)Fixed RHSA-2026:17792
Red Hat CodeReady Linux Builder EUS (v.9.6)Fixed RHSA-2026:17794
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:18063, RHSA-2026:19159
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:18041
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:18029, RHSA-2026:19371, RHSA-2026:19372, RHSA-2026:19374
Red Hat Enterprise Linux AppStream E4S (v.9.0)Fixed RHSA-2026:17791
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:17751
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:17790
Red Hat Enterprise Linux AppStream EUS (v.9.4)Fixed RHSA-2026:17792, RHSA-2026:17793
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:17752, RHSA-2026:17753, RHSA-2026:17794
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)Fixed RHSA-2026:18063, RHSA-2026:19159
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)Fixed RHSA-2026:18029, RHSA-2026:19374
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)Fixed RHSA-2026:17790
Red Hat Hardened ImagesFixed RHSA-2026:17417
Red Hat Openshift Data Foundation 4.14Fixed RHSA-2026:22396
Red Hat Openshift Data Foundation 4.15Fixed RHSA-2026:22393
Red Hat Openshift Data Foundation 4.16Fixed RHSA-2026:22394
Red Hat Openshift Data Foundation 4.17Fixed RHSA-2026:22390
Red Hat Openshift Data Foundation 4.18Fixed RHSA-2026:22388
Red Hat Openshift Data Foundation 4.19Fixed RHSA-2026:22389
Red Hat Openshift Data Foundation 4.20Fixed RHSA-2026:22383
Red Hat Openshift Data Foundation 4.21Fixed RHSA-2026:22382
Red Hat Satellite 6.18Fixed RHSA-2026:20442
Red Hat Satellite 6.19Fixed RHSA-2026:20444
Red Hat Update Infrastructure 5Fixed RHSA-2026:21275, RHSA-2026:58981
Not affected: 18 products
  • Red Hat 3scale API Management Platform 2
  • Red Hat CodeReady Linux Builder EUS (v.9.4)
  • Red Hat CodeReady Linux Builder EUS (v.9.6)
  • Red Hat Enterprise Linux AppStream E4S (v.9.0)
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux AppStream EUS (v.9.4)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • Red Hat Lightspeed proxy 1
  • Red Hat Openshift Data Foundation 4.14
  • Red Hat Openshift Data Foundation 4.15
  • Red Hat Openshift Data Foundation 4.16
  • Red Hat Openshift Data Foundation 4.17
  • Red Hat Openshift Data Foundation 4.18
  • Red Hat Openshift Data Foundation 4.19
  • Red Hat Openshift Data Foundation 4.20
  • Red Hat Openshift Data Foundation 4.21
  • Red Hat Update Infrastructure 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42945
  2. 2026-10-03 Alias added: GHSA-gcgv-v5gf-c543
  3. 2026-10-25 EPSS moved to the 99th percentile and above
  4. 2026-10-25 Priority changed: MEDIUM → HIGH

References

Exploit 1

Patch 1

Advisory 1

  • TI-2026-08132 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