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[USN-8543-2] Wget regression

Posted on 21 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8543-2
August 20, 2026

wget regression
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-8543-1 introduced a regression in Wget.

Software Description:
- wget: retrieves files from the web

Details:

USN-8543-1 fixed vulnerabilities in Wget. The update for CVE-2026-58472
was incomplete and could introduce a regression. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Wget mishandled semicolons in the userinfo
subcomponent of a URL. A remote attacker could possibly use this issue
to trick a user into connecting to a different host than intended. This
issue only affected Ubuntu 14.04 LTS. (CVE-2024-38428)

It was discovered that Wget incorrectly handled Metalink documents
containing a whitespace-only URL. A remote attacker could possibly use
this issue to cause a denial of service. This issue only affected Ubuntu
18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and
Ubuntu 26.04 LTS. (CVE-2026-58469)

It was discovered that Wget incorrectly handled Content-Range header
values, leading to an integer overflow. A remote attacker could
possibly use this issue to cause download desynchronization.
(CVE-2026-58470)

It was discovered that Wget incorrectly handled character set
conversion of server-supplied filenames. A remote attacker could
possibly use this issue to cause a denial of service or possibly execute
arbitrary code. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04
LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.
(CVE-2026-58471)

It was discovered that Wget incorrectly handled HTML attributes
requiring entity encoding. A remote attacker could possibly use this
issue to cause a denial of service or possibly execute arbitrary code.
(CVE-2026-58472)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
wget 1.25.0-2ubuntu4.4

Ubuntu 24.04 LTS
wget 1.21.4-1ubuntu4.5

Ubuntu 22.04 LTS
wget 1.21.2-2ubuntu1.5

Ubuntu 20.04 LTS
wget 1.20.3-1ubuntu2.1+esm4
Available with Ubuntu Pro

Ubuntu 18.04 LTS
wget 1.19.4-1ubuntu2.2+esm5
Available with Ubuntu Pro

Ubuntu 16.04 LTS
wget 1.17.1-1ubuntu1.5+esm5
Available with Ubuntu Pro

Ubuntu 14.04 LTS
wget 1.15-1ubuntu1.14.04.5+esm4
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8543-2
https://ubuntu.com/security/notices/USN-8543-1
https://bugs.launchpad.net/ubuntu/+source/wget/+bug/2163754

Package Information:
https://launchpad.net/ubuntu/+source/wget/1.25.0-2ubuntu4.4
https://launchpad.net/ubuntu/+source/wget/1.21.4-1ubuntu4.5
https://launchpad.net/ubuntu/+source/wget/1.21.2-2ubuntu1.5

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