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CVE-2026-6679

CVE-2026-6679 · DTLS 1.3 ACK serialization heap buffer overflow via integer truncation

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

A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.

CVSS 8.8 · High · EPSS 0.5%

Published
Updated

Stack: system

Affected products and versions

  • wolfssl

    Versions
    • ≥ 5.4.0, ≤ 5.9.0: Affected (semver)

    No fix published

  • wolfssl Debian:12

    Versions
    • 5.5.4-2
    • 5.5.4-2+deb12u1
    • 5.5.4-2+deb12u2
    • 5.5.4-2+deb12u3
    • 5.5.4-2.1
    • 5.6.4-1
    • 5.6.4-2
    • 5.6.6-1
    • 5.6.6-1.1
    • 5.6.6-1.2
    • 5.6.6-1.3
    • 5.6.6-1.3~exp1
    • 5.7.0-0.1
    • 5.7.0-0.2
    • 5.7.0-0.3
    • 5.7.2-0.1
    • 5.7.2-0.2
    • 5.7.2-0.3
    • 5.7.2-0.4
    • 5.8.2-1
    • 5.8.2-1.1
    • 5.8.2-1.2
    • 5.8.4-1
    • 5.9.0-0.1
    • 5.9.0-0.2
    • 5.9.1-0.1
    • 5.9.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Debian:13

    Versions
    • 5.7.2-0.1
    • 5.7.2-0.1+deb13u1
    • 5.7.2-0.1+deb13u2
    • 5.7.2-0.2
    • 5.7.2-0.3
    • 5.7.2-0.4
    • 5.8.2-1
    • 5.8.2-1.1
    • 5.8.2-1.2
    • 5.8.4-1
    • 5.9.0-0.1
    • 5.9.0-0.2
    • 5.9.1-0.1
    • 5.9.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:16.04:LTS

    Versions
    • 3.4.8+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:18.04:LTS

    Versions
    • 3.10.2+dfsg-2
    • 3.12.0+dfsg-1
    • 3.12.2+dfsg-1
    • 3.13.0+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:20.04:LTS

    Versions
    • 4.1.0+dfsg-2
    • 4.2.0+dfsg-1
    • 4.2.0+dfsg-2
    • 4.2.0+dfsg-3
    • 4.3.0+dfsg-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:22.04:LTS

    Versions
    • 4.6.0-3
    • 5.0.0-1
    • 5.1.1-1
    • 5.2.0-1
    • 5.2.0-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:24.04:LTS

    Versions
    • 5.5.4-2
    • 5.5.4-2.1
    • 5.6.4-2
    • 5.6.6-1.2
    • 5.6.6-1.3
    • 5.6.6-1.3build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • wolfssl Ubuntu:25.10

    Versions
    • 5.7.2-0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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