GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-derivation loop without any upper bound validation. A malicious FTP server or a network attacker positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX, causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The --timeout option does not mitigate this because it applies only to network I/O, not CPU computation. This issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:23991-1 advisory.

    This update for wget fixes the following issue:

    - CVE-2026-16599: server-controlled unbounded MD5 loop in FTP OPIE (bsc#1276962).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:22011-1 advisory.

    This update for wget fixes the following issue:

    - CVE-2026-16599: server-controlled unbounded MD5 loop in FTP OPIE (bsc#1276962).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The
    server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-
    derivation loop without any upper bound validation. A malicious FTP server or a network attacker
    positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX,
    causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The
    --timeout option does not mitigate this because it applies only to network I/O, not CPU computation. This
    issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa (CVE-2026-16599)

The remote SUSE Linux SLES12 / SLES_SAP12 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:4074-1 advisory.

    This update for wget fixes the following issue:

    - CVE-2026-16599: server-controlled unbounded MD5 loop in FTP OPIE (bsc#1276962).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:4049-1 advisory.

    This update for wget fixes the following issue:

    - CVE-2026-16599: server-controlled unbounded MD5 loop in FTP OPIE (bsc#1276962).

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - GNU wget is vulnerable to denial of service in its FTP OPIE/S-KEY authentication functionality. The     server-supplied sequence number from the FTP challenge line is used as an iteration count for an MD5 key-     derivation loop without any upper bound validation. A malicious FTP server or a network attacker     positioned to intercept FTP traffic can send a crafted OPIE challenge with a sequence number near INT_MAX,     causing wget to perform up to approximately 2.1 billion MD5 computations and suspend for some time. The
    --timeout option does not mitigate this because it applies only to network I/O, not CPU computation. This     issue was fixed in commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa (CVE-2026-16599)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
363079	SUSE SLES16 Security Update : wget (SUSE-SU-2026:23991-1)	Nessus	SuSE Local Security Checks	Local	medium
362896	openSUSE 16 Security Update : wget (openSUSE-SU-2026:22011-1)	Nessus	SuSE Local Security Checks	Local	medium
461748	Echo: wget: security update to 1.25.0-2+e3	Tenable Cloud Security	Echo Local Security Checks	Local	medium
461748	Echo: wget: security update to 1.25.0-2+e3	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	medium
348470	SUSE SLES12 Security Update : wget (SUSE-SU-2026:4074-1)	Nessus	SuSE Local Security Checks	Local	medium
348417	SUSE SLED15 / SLES15 Security Update : wget (SUSE-SU-2026:4049-1)	Nessus	SuSE Local Security Checks	Local	medium
340690	Linux Distros Unpatched Vulnerability : CVE-2026-16599	Nessus	Misc.	Local	medium

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CVE-2026-16599

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medium