Detections
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Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS : Perl vulnerabilities (USN-8736-1)

medium Nessus Plugin ID 344619

Synopsis

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

Description

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8736-1 advisory.

 It was discovered that Perl incorrectly handled certain large inputs during regular expression matching.
 An attacker could possibly use this issue to trigger out-of-bounds heap reads or writes, resulting in a denial of service or arbitrary code execution. (CVE-2026-15534)

 It was discovered that Perl incorrectly handled certain regular expression containing alternative matching branches. An attacker could

 possibly use this issue to cause incorrect regular expression matches, resulting in security restrictions being bypassed. (CVE-2026-19487)

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-8736-1

Plugin Details

Severity: Medium

ID: 344619

File Name: ubuntu_USN-8736-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/10/2026

Updated: 9/10/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.5

Percentile: 95.99

CVSS v2

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 3.5

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

CVSS Score Source: CVE-2026-15534

CVSS v3

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 5

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcgi-fast-perl, p-cpe:/a:canonical:ubuntu_linux:libperl5.18, p-cpe:/a:canonical:ubuntu_linux:libperl5.22, p-cpe:/a:canonical:ubuntu_linux:libperl5.26, p-cpe:/a:canonical:ubuntu_linux:libperl5.30, p-cpe:/a:canonical:ubuntu_linux:libperl5.34, p-cpe:/a:canonical:ubuntu_linux:libperl5.40, p-cpe:/a:canonical:ubuntu_linux:perl-base, p-cpe:/a:canonical:ubuntu_linux:perl-debug, p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.22, p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.26, p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.30, p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.34, p-cpe:/a:canonical:ubuntu_linux:perl-modules-5.40, p-cpe:/a:canonical:ubuntu_linux:perl-modules, p-cpe:/a:canonical:ubuntu_linux:perl

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 8/9/2026

Reference Information

CVE: CVE-2026-15534, CVE-2026-19487

IAVA: 2026-A-0889

USN: 8736-1