Description
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
Published: 2026-08-25
Score: 5.1 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 25 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Gnu
Gnu wget
Vendors & Products Gnu
Gnu wget

Tue, 25 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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
Title Denial of Service in GNU wget
Weaknesses CWE-606
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: CERT-PL

Published:

Updated: 2026-08-25T14:51:53.738Z

Reserved: 2026-07-22T14:11:18.939Z

Link: CVE-2026-16599

cve-icon Vulnrichment

Updated: 2026-08-25T14:46:09.957Z

cve-icon NVD

Status : Received

Published: 2026-08-25T15:16:30.340

Modified: 2026-08-25T15:16:30.340

Link: CVE-2026-16599

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T16:00:15Z

Weaknesses