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GNU wget CVE-2026-16599

| EUVDEUVD-2026-65494 MEDIUM
Unchecked Input for Loop Condition (CWE-606)
2026-08-25 CERT-PL GHSA-48r3-mr49-jp8x
5.1
CVSS 4.0 · Vendor: CERT-PL
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Severity by source

Vendor (CERT-PL) PRIMARY
5.1 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.3 MEDIUM

Network-delivered via FTP, requires user to initiate connection (UI:R), no privileges needed; impact is limited to temporary DoS of the wget process (A:L).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (CERT-PL).

CVSS VectorVendor: CERT-PL

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 25, 2026 - 15:16 vuln.today
CVE Published
Aug 25, 2026 - 14:17 cve.org
MEDIUM 5.1

DescriptionCVE.org

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

AnalysisAI

Denial of service in GNU wget's FTP OPIE/S-KEY authentication handler allows a malicious or intercepted FTP server to cause wget to perform approximately 2.1 billion MD5 computations by supplying a crafted sequence number near INT_MAX in the OPIE challenge line. All versions of GNU wget with OPIE/S-KEY FTP authentication support are affected per CPE cpe:2.3:a:gnu:wget:*:*:*:*:*:*:*:*. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the targeted wget instance connect to an FTP server that presents an OPIE/S-KEY challenge during authentication - a non-default, legacy authentication mechanism uncommon in modern FTP deployments. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 (Medium) reflects a network-accessible, low-complexity attack requiring active user interaction (UI:A), with impact limited to wget's own availability (VA:L) and no confidentiality or integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the upstream fix via commit e9697d98e7249b0f68a6be040a4f3dcc5bc101fa from the GNU wget GitLab repository (https://gitlab.com/gnuwget/wget/-/commit/e9697d98e7249b0f68a6be040a4f3dcc5bc101fa); monitor your Linux distribution's package tracker for an updated wget package incorporating this commit, then upgrade when available. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-16599 vulnerability details – vuln.today

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