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CVE-2026-16599

CVE-2026-16599 · Denial of Service in GNU wget

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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

CVSS 5.1 · Medium · EPSS 0.4%

Published
Updated

Stack: system

Affected products and versions

  • wget

    Versions
    • ≥ 0, ≤ 1.25.0: Affected (semver)

    No fix published

  • wget Debian:12

    Versions
    • 1.21.3-1
    • 1.21.3-1+deb12u1
    • 1.21.4-1
    • 1.24.5-1
    • 1.24.5-2
    • 1.25.0-1
    • 1.25.0-2
    • 1.25.0-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Debian:13

    Versions
    • 1.25.0-2
    • 1.25.0-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Debian:14

    Versions
    • 1.25.0-2
    • 1.25.0-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:Pro:14.04:LTS

    Versions
    • 1.14-2ubuntu1
    • 1.14-5ubuntu1
    • 1.15-1ubuntu1
    • 1.15-1ubuntu1.14.04.1
    • 1.15-1ubuntu1.14.04.2
    • 1.15-1ubuntu1.14.04.3
    • 1.15-1ubuntu1.14.04.4
    • 1.15-1ubuntu1.14.04.5
    • 1.15-1ubuntu1.14.04.5+esm2
    • 1.15-1ubuntu1.14.04.5+esm3
    • 1.15-1ubuntu1.14.04.5+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:Pro:16.04:LTS

    Versions
    • 1.16.1-1ubuntu1
    • 1.17.1-1ubuntu1
    • 1.17.1-1ubuntu1.1
    • 1.17.1-1ubuntu1.2
    • 1.17.1-1ubuntu1.3
    • 1.17.1-1ubuntu1.4
    • 1.17.1-1ubuntu1.5
    • 1.17.1-1ubuntu1.5+esm1
    • 1.17.1-1ubuntu1.5+esm3
    • 1.17.1-1ubuntu1.5+esm4
    • 1.17.1-1ubuntu1.5+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:Pro:18.04:LTS

    Versions
    • 1.19.1-3ubuntu1
    • 1.19.1-3ubuntu1.1
    • 1.19.2-1ubuntu1
    • 1.19.3-2ubuntu1
    • 1.19.4-1ubuntu2
    • 1.19.4-1ubuntu2.1
    • 1.19.4-1ubuntu2.2
    • 1.19.4-1ubuntu2.2+esm1
    • 1.19.4-1ubuntu2.2+esm3
    • 1.19.4-1ubuntu2.2+esm4
    • 1.19.4-1ubuntu2.2+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:Pro:20.04:LTS

    Versions
    • 1.20.3-1ubuntu1
    • 1.20.3-1ubuntu2
    • 1.20.3-1ubuntu2.1
    • 1.20.3-1ubuntu2.1+esm2
    • 1.20.3-1ubuntu2.1+esm3
    • 1.20.3-1ubuntu2.1+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:22.04:LTS

    Versions
    • 1.21-1ubuntu3
    • 1.21-1ubuntu4
    • 1.21-1ubuntu5
    • 1.21.2-2ubuntu1
    • 1.21.2-2ubuntu1.1
    • 1.21.2-2ubuntu1.3
    • 1.21.2-2ubuntu1.4
    • 1.21.2-2ubuntu1.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:24.04:LTS

    Versions
    • 1.21.3-1ubuntu1
    • 1.21.4-1ubuntu1
    • 1.21.4-1ubuntu2
    • 1.21.4-1ubuntu3
    • 1.21.4-1ubuntu4
    • 1.21.4-1ubuntu4.1
    • 1.21.4-1ubuntu4.3
    • 1.21.4-1ubuntu4.4
    • 1.21.4-1ubuntu4.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:26.10

    Versions
    • 1.25.0-2ubuntu4
    • 1.25.0-2ubuntu6
    • 1.25.0-3ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wget Ubuntu:26.04:LTS

    Versions
    • 1.25.0-2ubuntu3
    • 1.25.0-2ubuntu4
    • 1.25.0-2ubuntu4.2
    • 1.25.0-2ubuntu4.3
    • 1.25.0-2ubuntu4.4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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