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EPSS 0.4%top 63%

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module.

0
Unknown
VulnerabilityCVE-2026-56434gcveosvubuntu-cve-2026-56434ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-lts
Published: 07/16/2026 (07/16/2026, 00:00:00 UTC)
Source: GCVE Database
Product: nginx

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS v4.0

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
None
Vuln. Integrity
Low
Vuln. Availability
High
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]+esm8?arch=source&distro=esm-infra-legacy/trusty
Affected versions
=1.4.1-3ubuntu1=1.4.3-2ubuntu1=1.4.4-1ubuntu1=1.4.4-2ubuntu1=1.4.4-4ubuntu1=1.4.5-1ubuntu1=1.4.6-1ubuntu2=1.4.6-1ubuntu3=1.4.6-1ubuntu3.1=1.4.6-1ubuntu3.2=1.4.6-1ubuntu3.3=1.4.6-1ubuntu3.4=1.4.6-1ubuntu3.5=1.4.6-1ubuntu3.6=1.4.6-1ubuntu3.7=1.4.6-1ubuntu3.8=1.4.6-1ubuntu3.9=1.4.6-1ubuntu3.9+esm1=1.4.6-1ubuntu3.9+esm2=1.4.6-1ubuntu3.9+esm3=1.4.6-1ubuntu3.9+esm4=1.4.6-1ubuntu3.9+esm5=1.4.6-1ubuntu3.9+esm6=1.4.6-1ubuntu3.9+esm8
Ubuntu:Pro:16.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]+esm9?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=1.9.3-1ubuntu1=1.9.6-2ubuntu1=1.9.6-2ubuntu2=1.9.9-0ubuntu1=1.9.9-1ubuntu1=1.9.10-0ubuntu1=1.9.10-1ubuntu1=1.9.11-0ubuntu1=1.9.11-0ubuntu2=1.9.12-0ubuntu1=1.9.13-0ubuntu1=1.9.14-0ubuntu1=1.9.15-0ubuntu1=1.10.0-0ubuntu0.16.04.1=1.10.0-0ubuntu0.16.04.2=1.10.0-0ubuntu0.16.04.3=1.10.0-0ubuntu0.16.04.4=1.10.3-0ubuntu0.16.04.1=1.10.3-0ubuntu0.16.04.2=1.10.3-0ubuntu0.16.04.3=1.10.3-0ubuntu0.16.04.4=1.10.3-0ubuntu0.16.04.5=1.10.3-0ubuntu0.16.04.5+esm1=1.10.3-0ubuntu0.16.04.5+esm2=1.10.3-0ubuntu0.16.04.5+esm3=1.10.3-0ubuntu0.16.04.5+esm4=1.10.3-0ubuntu0.16.04.5+esm5=1.10.3-0ubuntu0.16.04.5+esm6=1.10.3-0ubuntu0.16.04.5+esm7=1.10.3-0ubuntu0.16.04.5+esm9
Ubuntu:Pro:18.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]+esm4?arch=source&distro=esm-infra/bionic
Affected versions
=1.12.1-0ubuntu2=1.13.6-2ubuntu1=1.13.6-2ubuntu2=1.13.10-1ubuntu1=1.13.12-0ubuntu1=1.14.0-0ubuntu1=1.14.0-0ubuntu1.1=1.14.0-0ubuntu1.2=1.14.0-0ubuntu1.3=1.14.0-0ubuntu1.4=1.14.0-0ubuntu1.5=1.14.0-0ubuntu1.6=1.14.0-0ubuntu1.7=1.14.0-0ubuntu1.9=1.14.0-0ubuntu1.10=1.14.0-0ubuntu1.11=1.14.0-0ubuntu1.11+esm1=1.14.0-0ubuntu1.11+esm2=1.14.0-0ubuntu1.11+esm4
Ubuntu:Pro:20.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]+esm3?arch=source&distro=esm-infra/focal
Affected versions
=1.16.1-0ubuntu2=1.16.1-0ubuntu3=1.17.5-0ubuntu1=1.17.6-0ubuntu1=1.17.7-0ubuntu1=1.17.8-0ubuntu1=1.17.8-0ubuntu2=1.17.8-0ubuntu3=1.17.9-0ubuntu1=1.17.9-0ubuntu2=1.17.9-0ubuntu3=1.17.10-0ubuntu1=1.18.0-0ubuntu1=1.18.0-0ubuntu1.2=1.18.0-0ubuntu1.3=1.18.0-0ubuntu1.4=1.18.0-0ubuntu1.5=1.18.0-0ubuntu1.6=1.18.0-0ubuntu1.7=1.18.0-0ubuntu1.7+esm1=1.18.0-0ubuntu1.7+esm3
Ubuntu:22.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]?arch=source&distro=jammy
Affected versions
=1.18.0-6ubuntu11=1.18.0-6ubuntu12=1.18.0-6ubuntu14=1.18.0-6ubuntu14.1=1.18.0-6ubuntu14.2=1.18.0-6ubuntu14.3=1.18.0-6ubuntu14.4=1.18.0-6ubuntu14.5=1.18.0-6ubuntu14.6=1.18.0-6ubuntu14.7=1.18.0-6ubuntu14.8=1.18.0-6ubuntu14.10=1.18.0-6ubuntu14.11=1.18.0-6ubuntu14.12=1.18.0-6ubuntu14.13=1.18.0-6ubuntu14.14=1.18.0-6ubuntu14.15=1.18.0-6ubuntu14.16=1.18.0-6ubuntu14.17
Ubuntu:24.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]?arch=source&distro=noble
Affected versions
=1.24.0-1ubuntu1=1.24.0-2ubuntu1=1.24.0-2ubuntu2=1.24.0-2ubuntu3=1.24.0-2ubuntu4=1.24.0-2ubuntu6=1.24.0-2ubuntu7=1.24.0-2ubuntu7.1=1.24.0-2ubuntu7.3=1.24.0-2ubuntu7.4=1.24.0-2ubuntu7.5=1.24.0-2ubuntu7.6=1.24.0-2ubuntu7.7=1.24.0-2ubuntu7.8=1.24.0-2ubuntu7.9=1.24.0-2ubuntu7.10=1.24.0-2ubuntu7.11=1.24.0-2ubuntu7.12=1.24.0-2ubuntu7.13=1.24.0-2ubuntu7.14
Ubuntu:26.04:LTSmore threats →ghsa
nginx
pkg:deb/ubuntu/[email protected]?arch=source&distro=resolute
Affected versions
=1.28.0-6ubuntu1=1.28.1-2ubuntu1=1.28.1-3ubuntu1=1.28.2-2ubuntu1=1.28.3-2ubuntu1=1.28.3-2ubuntu1.1=1.28.3-2ubuntu1.2=1.28.3-2ubuntu1.3=1.28.3-2ubuntu1.4=1.28.3-2ubuntu1.5=1.28.3-2ubuntu1.6=1.28.3-2ubuntu1.7

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-56434
Osv Schema Version
1.7.0
Aliases
[]
Ecosystems
["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
Database Specific Severity
null
Cvss Version
4.0

Threat ID: 6a5e7a702a4a8d59899de926

Added to database: 07/20/2026, 19:43:44 UTC

Last updated: 07/31/2026, 19:24:46 UTC

Views: 11

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