UBUNTU-CVE-2026-18329

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Source
https://ubuntu.com/security/CVE-2026-18329
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18329.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18329
Upstream
  • CVE-2026-18329
Published
2026-09-02T16:17:00Z
Modified
2026-09-16T14:01:35Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N CVSS Calculator
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Description NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability when a js_access handler performs asynchronous request body processing and an exception is thrown during asynchronous access-control evaluation before an explicit access denial is returned. An unauthenticated attacker can exploit this vulnerability by sending a crafted HTTP request that triggers an error condition in the access validation logic. This may cause the js_access phase to fail open, allowing the request to proceed instead of being denied, resulting in an authentication or authorization bypass and unauthorized access to protected resources. Impact This vulnerability may allow remote attackers to bypass js_access controls. 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.

References

Affected packages

Ubuntu:24.04:LTS / libnginx-mod-js

Package

Name
libnginx-mod-js
Purl
pkg:deb/ubuntu/libnginx-mod-js?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.7.12-2
0.8.2-1ubuntu1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libnginx-mod-http-js",
            "binary_version":  "0.8.2-1ubuntu1"
        },
        {
            "binary_name":  "libnginx-mod-stream-js",
            "binary_version":  "0.8.2-1ubuntu1"
        },
        {
            "binary_name":  "njs",
            "binary_version":  "0.8.2-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18329.json"

Ubuntu:Pro:26.04:LTS / libnginx-mod-js

Package

Name
libnginx-mod-js
Purl
pkg:deb/ubuntu/libnginx-mod-js?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.9.1-1ubuntu2
0.9.1-1ubuntu3
0.9.4-1~build1
0.9.4-1
0.9.4-1build1
0.9.4-1build2
0.9.4-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libnginx-mod-http-js",
            "binary_version":  "0.9.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "libnginx-mod-stream-js",
            "binary_version":  "0.9.4-1ubuntu0.1~esm1"
        },
        {
            "binary_name":  "njs",
            "binary_version":  "0.9.4-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18329.json"