Detections
Analytics
Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : nginx vulnerabilities (USN-8458-1)
critical Nessus Plugin ID 322264
Synopsis
The remote Ubuntu host is missing one or more security updates.Description
The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8458-1 advisory.It was discovered that nginx incorrectly handled large headers when proxying HTTP/2 traffic. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. (CVE-2026-42055)
It was discovered that nginx incorrectly handled character set conversion under certain circumstances. A remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-48142)
Tenable has extracted the preceding description block directly from the Ubuntu security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Critical
ID: 322264
File Name: ubuntu_USN-8458-1.nasl
Version: 1.1
Type: Local
Agent: unix
Family: Ubuntu Local Security Checks
Published: 6/23/2026
Updated: 6/23/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
CVSS v2
Risk Factor: High
Base Score: 7.6
Temporal Score: 5.6
Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-42055
CVSS v3
Risk Factor: High
Base Score: 8.1
Temporal Score: 7.1
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.2
Threat Score: 7.2
Threat Vector: CVSS:4.0/E:U
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Vulnerability Information
CPE: p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-upstream-fair, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-fancyindex, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream, p-cpe:/a:canonical:ubuntu_linux:nginx-common, p-cpe:/a:canonical:ubuntu_linux:nginx-core, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-subs-filter, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip, p-cpe:/a:canonical:ubuntu_linux:nginx-dev, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-headers-more-filter, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-uploadprogress, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-auth-pam, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-stream-geoip2, p-cpe:/a:canonical:ubuntu_linux:nginx-light, p-cpe:/a:canonical:ubuntu_linux:nginx-full, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-echo, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-geoip2, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-nchan, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-dav-ext, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-xslt-filter, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-image-filter, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-ndk, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-perl, p-cpe:/a:canonical:ubuntu_linux:nginx-extras, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-http-cache-purge, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-mail, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libnginx-mod-rtmp, p-cpe:/a:canonical:ubuntu_linux:nginx
Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release
Exploit Ease: No known exploits are available
Patch Publication Date: 6/22/2026
Vulnerability Publication Date: 6/17/2026
Reference Information
CVE: CVE-2026-42055, CVE-2026-48142
IAVA: 2026-A-0601
USN: 8458-1