Debian dla-4670 : php-phpseclib - security update

high Nessus Plugin ID 325133

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4670 advisory.

- ----------------------------------------------------------------------- Debian LTS Advisory DLA-4670-1 [email protected] https://www.debian.org/lts/security/ Utkarsh Gupta July 05, 2026 https://wiki.debian.org/LTS
- -----------------------------------------------------------------------

Package : php-phpseclib Version : 2.0.30-2+deb11u3 CVE ID : CVE-2023-52892 CVE-2026-32935 CVE-2026-40194 CVE-2026-44167 CVE-2026-55599 Debian Bug : 1131483

Several vulnerabilities were discovered in phpseclib, a PHP secure communications library, which could result in hostname validation bypass, timing side-channel attacks, denial of service, and server-side request forgery (SSRF).

CVE-2023-52892

X509.php did not properly escape regular expression special characters in a certificate's subjectAltName, allowing a crafted certificate to bypass hostname validation in validateURL().

CVE-2026-32935

The block cipher unpadding routine in Crypt/Base.php used a short-circuiting comparison, creating a timing side channel that could aid padding-oracle-style attacks.

CVE-2026-40194

The SSH2 implementation compared incoming packet HMACs using a variable-time string comparison, creating a timing side channel on cryptographic material.

CVE-2026-44167

The ASN.1 decoder's 4096-byte Object Identifier limit (mitigating CVE-2024-27355) was still large enough to allow an OID amplification denial of service via crafted ASN.1 structures.

CVE-2026-55599

File_X509 could automatically fetch a URL from a certificate's Authority Information Access extension without validating the destination, allowing SSRF via a crafted certificate.

For Debian 11 bullseye, these problems have been fixed in version 2.0.30-2+deb11u3.

We recommend that you upgrade your php-phpseclib packages.

For the detailed security status of php-phpseclib please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/php-phpseclib

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the php-phpseclib packages.

Plugin Details

Severity: High

ID: 325133

File Name: debian_DLA-4670.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 7/6/2026

Updated: 7/6/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.52

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4.2

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

CVSS Score Source: CVE-2026-32935

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.3

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

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

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:P

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:php-phpseclib

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/5/2026

Vulnerability Publication Date: 3/1/2024

Reference Information

CVE: CVE-2023-52892, CVE-2024-27355, CVE-2026-32935, CVE-2026-40194, CVE-2026-44167, CVE-2026-55599

Detections

Analytics