CVE-2026-16599
Fixed in a distro release EPSS <1%CVSS 5.1
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
Products: gnu wget
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | wget | 1.25.0-r17 |
| Debian 12 | wget | no fix |
| Debian 13 | wget | no fix |
| Debian 14 | wget | no fix |
| SUSE Linux Enterprise Micro 5.5 | wget | 1.20.3-150000.3.40.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | wget | 1.24.5-150700.3.12.1 |
| SUSE Linux Enterprise Server 16.0 | wget | 1.25.0-160000.4.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | wget | 1.14-21.31.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | wget | 1.25.0-160000.4.1 |
| SUSE Linux Micro 6.0 | wget | 1.24.5-5.1 |
| SUSE Linux Micro 6.1 | wget | 1.24.5-slfo.1.1_6.1 |
| SUSE Linux Micro 6.2 | wget | 1.25.0-160000.4.1 |
| Ubuntu 22.04 LTS | wget | no fix |
| Ubuntu 24.04 LTS | wget | no fix |
| Ubuntu 26.04 LTS | wget | no fix |
| Ubuntu 26.10 | wget | no fix |
| Ubuntu Pro 14.04 LTS | wget | no fix |
| Ubuntu Pro 16.04 LTS | wget | no fix |
| Ubuntu Pro 18.04 LTS | wget | no fix |
| Ubuntu Pro 20.04 LTS | wget | no fix |
| Wolfi | wget | 1.25.0-r17 |
| openSUSE Leap 16.0 | wget | 1.25.0-160000.4.1 |
| openSUSE Tumbleweed | wget | 1.25.0-7.1 |