CVE-2026-16599
Denial of Service in GNU wget
- State
- Published
- Severity
- 5.1 Medium
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Reserved
- Jul 22, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | CERT-PL |
Weaknesses
- CWE-606 Unchecked input for loop condition
Affected Products
| Product | Versions |
|---|---|
wgetGNU |
|
References
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