CVE catalog
CVE-2026-16599
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
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.38% · Oct 25, 2026
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
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | wget | sid | 1.25.0-3 | vulnerable |
| Debian | wget | forky | 1.25.0-3 | vulnerable |
| Debian | wget | trixie | 1.25.0-2 | vulnerable |
| Debian | wget | bookworm | 1.21.3-1+deb12u1 | vulnerable |
| Suse | wget | linux enterprise server 16.0 | 1.25.0-160000.4.1 | fixed |
| Suse | wget | linux enterprise server for sap applications 16.0 | 1.25.0-160000.4.1 | fixed |
| Suse | wget | linux micro 6.2 | 1.25.0-160000.4.1 | fixed |
| Opensuse | wget | leap 16.0 | 1.25.0-160000.4.1 | fixed |
| Suse | wget | linux micro 6.1 | 1.24.5-slfo.1.1_6.1 | fixed |
| Suse | wget | linux micro 6.0 | 1.24.5-5.1 | fixed |
| Suse | wget | linux enterprise server ltss extended security 12 sp5 | 1.14-21.31.1 | fixed |
| Suse | wget | linux enterprise micro 5.5 | 1.20.3-150000.3.40.1 | fixed |
| Suse | wget | linux enterprise module for basesystem 15 sp7 | 1.24.5-150700.3.12.1 | fixed |
| Opensuse | wget | tumbleweed | 1.25.0-7.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | wget | source | sid | (unfixed) | unimportant | Not reported | [1145868] |
| Debian | wget | source | forky | (unfixed) | unimportant | Not reported | [1145868] |
| Debian | wget | source | trixie | (unfixed) | unimportant | Not reported | [1145868] |
| Debian | wget | source | bookworm | (unfixed) | unimportant | Not reported | [1145868] |
| Suse | wget | rpm | linux enterprise server 16.0 | 1.25.0-160000.4.1 | Not reported | SUSE-SU-2026:23991-1 | Not reported |
| Suse | wget | rpm | linux enterprise server for sap applications 16.0 | 1.25.0-160000.4.1 | Not reported | SUSE-SU-2026:23991-1 | Not reported |
| Suse | wget | rpm | linux micro 6.2 | 1.25.0-160000.4.1 | Not reported | SUSE-SU-2026:23975-1 | Not reported |
| Opensuse | wget | rpm | leap 16.0 | 1.25.0-160000.4.1 | Not reported | OPENSUSE-SU-2026:22011-1 | Not reported |
| Suse | wget | rpm | linux micro 6.1 | 1.24.5-slfo.1.1_6.1 | Not reported | SUSE-SU-2026:23520-1 | Not reported |
| Suse | wget | rpm | linux micro 6.0 | 1.24.5-5.1 | Not reported | SUSE-SU-2026:23455-1 | Not reported |
| Suse | wget | rpm | linux enterprise server ltss extended security 12 sp5 | 1.14-21.31.1 | Not reported | SUSE-SU-2026:4074-1 | Not reported |
| Suse | wget | rpm | linux enterprise micro 5.5 | 1.20.3-150000.3.40.1 | Not reported | SUSE-SU-2026:4053-1 | Not reported |
| Suse | wget | rpm | linux enterprise module for basesystem 15 sp7 | 1.24.5-150700.3.12.1 | Not reported | SUSE-SU-2026:4049-1 | Not reported |
| Opensuse | wget | rpm | tumbleweed | 1.25.0-7.1 | Not reported | OPENSUSE-SU-2026:11646-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [wget]Affected
Details (2)
1.21.3-1+deb12u1· amd64 · bookwormAffected
nvd · wget · debian · bookworm; nvd · wget · debian · 12
1.21.3-1+deb12u1· arm64 · bookwormAffected
nvd · wget · debian · bookworm; nvd · wget · debian · 12
[Debian 13 (Trixie)]
- [wget]Affected
Details (2)
1.25.0-2· amd64 · trixieAffected
nvd · wget · debian · 13
1.25.0-2· arm64 · trixieAffected
nvd · wget · debian · 13
[openSUSE Tumbleweed]
- [wget-lang]Unknown
Source package: [wget]
Details (1)
1.25.0-7.1· noarch · tumbleweedUnknown · Fixed:
1.25.0-7.1Version impact unknown
nvd · wget · opensuse · tumbleweed
- [wget]Fixed
Source package: [wget]
Details (1)
1.25.0-7.1· x86_64 · tumbleweedFixed · Fixed:
1.25.0-7.1nvd · wget · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11646-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-16599]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-16599]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23455-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23520-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23975-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23991-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4049-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4053-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4074-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11646-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:22011-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-16599]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-16599.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3024.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]