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Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS : curl vulnerabilities (USN-8525-1)

high Nessus Plugin ID 326253

Synopsis

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

Description

The remote Ubuntu 14.04 LTS / 18.04 LTS / 20.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8525-1 advisory.

 Harry Sintonen discovered that curl incorrectly handled credentials when following HTTP redirects in conjunction with .netrc files. An attacker could possibly use this issue to obtain sensitive information.
 This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS. (CVE-2024-11053)

 Hiroki Kurosawa discovered that curl incorrectly handled OCSP stapling responses. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2024-8096)

 Joshua Rogers discovered that curl had a use-after-free vulnerability when resetting and cleaning up HTTP/2 stream handles. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.04, and Ubuntu 25.10.
 (CVE-2026-10536)

 Quac Tran and Ngoc Hieu discovered that curl incorrectly reused connections when switching authentication methods to the same host. An attacker could possibly use this issue to obtain sensitive information or perform unauthorized actions. This issue only affected Ubuntu 20.04 LTS. (CVE-2026-5545)

 Osama Hamad discovered that curl incorrectly reused SMB connections when the target share differed between transfers. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2026-5773)

 Muhamad Arga Reksapati discovered that curl incorrectly forwarded Digest proxy authentication credentials to a different proxy host. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2026-7168)

 It was discovered that curl incorrectly skipped SSH host verification options when using schemeless URLs with --proto-default. An attacker could possibly use this issue to perform machine-in-the-middle attacks.
 This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-12064)

 It was discovered that curl did not enforce an upper bound on memory allocated for unacknowledged WebSocket PING frames. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10. (CVE-2026-11586)

 It was discovered that curl could stall indefinitely when a malicious HTTP/3 server sent a continuous stream of empty UDP datagrams. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 25.10. (CVE-2026-11352)

 It was discovered that curl could incorrectly continue trusting a native platform CA store after an application switched the handle to use custom CA material. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 25.10. (CVE-2026-11564)

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-8525-1

Plugin Details

Severity: High

ID: 326253

File Name: ubuntu_USN-8525-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 7/10/2026

Updated: 7/10/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.06

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-5773

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcurl3t64-gnutls, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcurl3-gnutls, p-cpe:/a:canonical:ubuntu_linux:libcurl4t64, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:curl, p-cpe:/a:canonical:ubuntu_linux:libcurl3, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libcurl4-gnutls-dev, p-cpe:/a:canonical:ubuntu_linux:libcurl3-nss, p-cpe:/a:canonical:ubuntu_linux:libcurl4, p-cpe:/a:canonical:ubuntu_linux:libcurl4-nss-dev, p-cpe:/a:canonical:ubuntu_linux:libcurl4-openssl-dev, cpe:/o:canonical:ubuntu_linux:26.04:-:lts

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/9/2026

Vulnerability Publication Date: 12/12/2023

Reference Information

CVE: CVE-2024-11053, CVE-2024-8096, CVE-2026-10536, CVE-2026-11352, CVE-2026-11564, CVE-2026-11586, CVE-2026-12064, CVE-2026-5545, CVE-2026-5773, CVE-2026-7168

IAVA: 2024-A-0571-S, 2024-A-0794-S, 2026-A-0397-S, 2026-A-0627

USN: 8525-1