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Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS : PHP vulnerabilities (USN-8743-1)

critical Nessus Plugin ID 344783

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS / Pro Realtime 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8743-1 advisory.

 It was discovered that PHP incorrectly handled backslash escaping in the PostgreSQL extension. An attacker could use this issue to perform SQL injection attacks. (CVE-2026-17543)

 It was discovered that PHP incorrectly handled certain inputs to the bccomp() function. An attacker could use this issue to cause an out-of- bounds write, resulting in a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-17544)

 It was discovered that PHP incorrectly handled circular symbolic links in phar archives. An attacker could use this issue to cause unbounded recursion, resulting in a denial of service. (CVE-2026-7260)

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

https://ubuntu.com/security/notices/USN-8743-1

Plugin Details

Severity: Critical

ID: 344783

File Name: ubuntu_USN-8743-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.9

Percentile: 96.62

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-17544

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-php7.4, p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-php8.0, p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-php8.1, p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-php8.3, p-cpe:/a:canonical:ubuntu_linux:libapache2-mod-php8.5, p-cpe:/a:canonical:ubuntu_linux:libphp8.1-embed, p-cpe:/a:canonical:ubuntu_linux:libphp8.3-embed, p-cpe:/a:canonical:ubuntu_linux:libphp8.5-embed, p-cpe:/a:canonical:ubuntu_linux:php8.1-bcmath, p-cpe:/a:canonical:ubuntu_linux:php8.1-bz2, p-cpe:/a:canonical:ubuntu_linux:php8.1-cgi, p-cpe:/a:canonical:ubuntu_linux:php8.1-cli, p-cpe:/a:canonical:ubuntu_linux:php8.1-common, p-cpe:/a:canonical:ubuntu_linux:php8.1-curl, p-cpe:/a:canonical:ubuntu_linux:php8.1-dba, p-cpe:/a:canonical:ubuntu_linux:php8.1-enchant, p-cpe:/a:canonical:ubuntu_linux:php8.1-fpm, p-cpe:/a:canonical:ubuntu_linux:php8.1-gd, p-cpe:/a:canonical:ubuntu_linux:php8.1-gmp, p-cpe:/a:canonical:ubuntu_linux:php8.1-imap, p-cpe:/a:canonical:ubuntu_linux:php8.1-interbase, p-cpe:/a:canonical:ubuntu_linux:php8.1-intl, p-cpe:/a:canonical:ubuntu_linux:php8.1-ldap, p-cpe:/a:canonical:ubuntu_linux:php8.1-mbstring, p-cpe:/a:canonical:ubuntu_linux:php8.1-mysql, p-cpe:/a:canonical:ubuntu_linux:php8.1-odbc, p-cpe:/a:canonical:ubuntu_linux:php8.1-opcache, p-cpe:/a:canonical:ubuntu_linux:php8.1-pgsql, p-cpe:/a:canonical:ubuntu_linux:php8.1-phpdbg, p-cpe:/a:canonical:ubuntu_linux:php8.1-pspell, p-cpe:/a:canonical:ubuntu_linux:php8.1-readline, p-cpe:/a:canonical:ubuntu_linux:php8.1-snmp, p-cpe:/a:canonical:ubuntu_linux:php8.1-soap, p-cpe:/a:canonical:ubuntu_linux:php8.1-sqlite3, p-cpe:/a:canonical:ubuntu_linux:php8.1-sybase, p-cpe:/a:canonical:ubuntu_linux:php8.1-tidy, p-cpe:/a:canonical:ubuntu_linux:php8.1-xml, p-cpe:/a:canonical:ubuntu_linux:php8.1-xsl, p-cpe:/a:canonical:ubuntu_linux:php8.1-zip, p-cpe:/a:canonical:ubuntu_linux:php8.1, p-cpe:/a:canonical:ubuntu_linux:php8.3-bcmath, p-cpe:/a:canonical:ubuntu_linux:php8.3-bz2, p-cpe:/a:canonical:ubuntu_linux:php8.3-cgi, p-cpe:/a:canonical:ubuntu_linux:php8.3-cli, p-cpe:/a:canonical:ubuntu_linux:php8.3-common, p-cpe:/a:canonical:ubuntu_linux:php8.3-curl, p-cpe:/a:canonical:ubuntu_linux:php8.3-dba, p-cpe:/a:canonical:ubuntu_linux:php8.3-enchant, p-cpe:/a:canonical:ubuntu_linux:php8.3-fpm, p-cpe:/a:canonical:ubuntu_linux:php8.3-gd, p-cpe:/a:canonical:ubuntu_linux:php8.3-gmp, p-cpe:/a:canonical:ubuntu_linux:php8.3-imap, p-cpe:/a:canonical:ubuntu_linux:php8.3-interbase, p-cpe:/a:canonical:ubuntu_linux:php8.3-intl, p-cpe:/a:canonical:ubuntu_linux:php8.3-ldap, p-cpe:/a:canonical:ubuntu_linux:php8.3-mbstring, p-cpe:/a:canonical:ubuntu_linux:php8.3-mysql, p-cpe:/a:canonical:ubuntu_linux:php8.3-odbc, p-cpe:/a:canonical:ubuntu_linux:php8.3-opcache, p-cpe:/a:canonical:ubuntu_linux:php8.3-pgsql, p-cpe:/a:canonical:ubuntu_linux:php8.3-phpdbg, p-cpe:/a:canonical:ubuntu_linux:php8.3-pspell, p-cpe:/a:canonical:ubuntu_linux:php8.3-readline, p-cpe:/a:canonical:ubuntu_linux:php8.3-snmp, p-cpe:/a:canonical:ubuntu_linux:php8.3-soap, p-cpe:/a:canonical:ubuntu_linux:php8.3-sqlite3, p-cpe:/a:canonical:ubuntu_linux:php8.3-sybase, p-cpe:/a:canonical:ubuntu_linux:php8.3-tidy, p-cpe:/a:canonical:ubuntu_linux:php8.3-xml, p-cpe:/a:canonical:ubuntu_linux:php8.3-xsl, p-cpe:/a:canonical:ubuntu_linux:php8.3-zip, p-cpe:/a:canonical:ubuntu_linux:php8.3, p-cpe:/a:canonical:ubuntu_linux:php8.5-bcmath, p-cpe:/a:canonical:ubuntu_linux:php8.5-bz2, p-cpe:/a:canonical:ubuntu_linux:php8.5-cgi, p-cpe:/a:canonical:ubuntu_linux:php8.5-cli, p-cpe:/a:canonical:ubuntu_linux:php8.5-common, p-cpe:/a:canonical:ubuntu_linux:php8.5-curl, p-cpe:/a:canonical:ubuntu_linux:php8.5-dba, p-cpe:/a:canonical:ubuntu_linux:php8.5-enchant, p-cpe:/a:canonical:ubuntu_linux:php8.5-fpm, p-cpe:/a:canonical:ubuntu_linux:php8.5-gd, p-cpe:/a:canonical:ubuntu_linux:php8.5-gmp, p-cpe:/a:canonical:ubuntu_linux:php8.5-interbase, p-cpe:/a:canonical:ubuntu_linux:php8.5-intl, p-cpe:/a:canonical:ubuntu_linux:php8.5-ldap, p-cpe:/a:canonical:ubuntu_linux:php8.5-litespeed, p-cpe:/a:canonical:ubuntu_linux:php8.5-mbstring, p-cpe:/a:canonical:ubuntu_linux:php8.5-mysql, p-cpe:/a:canonical:ubuntu_linux:php8.5-odbc, p-cpe:/a:canonical:ubuntu_linux:php8.5-pgsql, p-cpe:/a:canonical:ubuntu_linux:php8.5-phpdbg, p-cpe:/a:canonical:ubuntu_linux:php8.5-readline, p-cpe:/a:canonical:ubuntu_linux:php8.5-snmp, p-cpe:/a:canonical:ubuntu_linux:php8.5-soap, p-cpe:/a:canonical:ubuntu_linux:php8.5-sqlite3, p-cpe:/a:canonical:ubuntu_linux:php8.5-sybase, p-cpe:/a:canonical:ubuntu_linux:php8.5-tidy, p-cpe:/a:canonical:ubuntu_linux:php8.5-xml, p-cpe:/a:canonical:ubuntu_linux:php8.5-xsl, p-cpe:/a:canonical:ubuntu_linux:php8.5-zip, p-cpe:/a:canonical:ubuntu_linux:php8.5

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/10/2026

Vulnerability Publication Date: 7/28/2026

Reference Information

CVE: CVE-2026-17543, CVE-2026-17544, CVE-2026-7260

USN: 8743-1