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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : cpp-httplib vulnerability (USN-8470-1)

critical Nessus Plugin ID 322948

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8470-1 advisory.

 It was discovered that cpp-httplib incorrectly percent-decoded HTTP request header values. A remote attacker could use this to inject crafted header content possibly leading to response splitting, log injection or proxy smuggling.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue 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-8470-1

Plugin Details

Severity: Critical

ID: 322948

File Name: ubuntu_USN-8470-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/26/2026

Updated: 6/26/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.6

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2026-45372

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.9

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:libcpp-httplib0, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcpp-httplib-dev, p-cpe:/a:canonical:ubuntu_linux:libcpp-httplib0.18, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcpp-httplib0.26, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcpp-httplib0.14t64

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: 6/25/2026

Vulnerability Publication Date: 5/29/2026

Reference Information

CVE: CVE-2026-45372

USN: 8470-1