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CVE-2026-42764

CVE-2026-42764 · NULL Pointer Dereference in QUIC Server Initial Packet Handling

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

Issue summary: Receiving a QUIC initial packet with an invalid token may trigger a NULL pointer dereference in the OpenSSL QUIC server with address validation disabled. Impact summary: NULL pointer dereference typically causes abnormal termination of the affected QUIC server process and a Denial of Service. If the address validation is disabled in the OpenSSL QUIC server implementation, an attacker can crash the server by sending an initial packet with an invalid or expired token. By default, the client address validation is enabled in the OpenSSL QUIC server implementation, which makes the default configuration not vulnerable to this issue. However if the SSL_LISTENER_FLAG_NO_VALIDATE is used with the SSL_new_listener() call, the address validation is disabled making the vulnerable code reachable. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS 7.5 · High · EPSS 0.8% · Fix available

Published
Updated

Stack: system · network

Affected products and versions

  • openssl

    Versions
    • ≥ 4.0.0, < 4.0.1: Affected (semver)
    • ≥ 3.6.0, < 3.6.3: Affected (semver)
    • ≥ 3.5.0, < 3.5.7: Affected (semver)

    Update to 3.5.7; Update to 3.6.3; Update to 4.0.1

  • openssl Debian:13

    Versions
    • 3.5.1-1
    • 3.5.1-1+deb13u1
    • 3.5.2-1
    • 3.5.3-1
    • 3.5.4-1
    • 3.5.4-1~deb13u1
    • 3.5.4-1~deb13u2
    • 3.5.5-1
    • 3.5.5-1~deb13u1
    • 3.5.5-1~deb13u2
    • 3.5.6-1~deb13u1
    Affected ranges
    • ECOSYSTEM: < 3.5.6-1~deb13u2

    Update to 3.5.6-1~deb13u2

  • openssl Debian:14

    Versions
    • 3.5.1-1
    • 3.5.2-1
    • 3.5.3-1
    • 3.5.4-1
    • 3.5.4-1~deb13u1
    • 3.5.4-1~deb13u2
    • 3.5.5-1
    • 3.5.5-1~deb13u1
    • 3.5.5-1~deb13u2
    • 3.5.6-1~deb13u1
    • 3.5.6-1~deb13u2
    • 3.5.7-1~deb13u1
    • 3.5.7-1~deb13u2
    • 3.5.7-1~deb13u3
    • 3.6.0-1
    • 3.6.0-2
    • 3.6.0~~alpha1-1
    • 3.6.0~~beta1-1
    • 3.6.1-1
    • 3.6.1-2
    • 3.6.1-3
    • 3.6.2-1
    Affected ranges
    • ECOSYSTEM: < 3.6.3-1

    Update to 3.6.3-1

  • nodejs Ubuntu:Pro:22.04:LTS

    Versions
    • 12.22.5~dfsg-5ubuntu1
    • 12.22.7~dfsg-2ubuntu1
    • 12.22.7~dfsg-2ubuntu3
    • 12.22.9~dfsg-1ubuntu2
    • 12.22.9~dfsg-1ubuntu3
    • 12.22.9~dfsg-1ubuntu3.1
    • 12.22.9~dfsg-1ubuntu3.2
    • 12.22.9~dfsg-1ubuntu3.3
    • 12.22.9~dfsg-1ubuntu3.4
    • 12.22.9~dfsg-1ubuntu3.5
    • 12.22.9~dfsg-1ubuntu3.6
    • 12.22.9~dfsg-1ubuntu3.6+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • openssl Ubuntu:25.10

    Versions
    • 3.4.1-1ubuntu3
    • 3.5.0-2ubuntu1
    • 3.5.2-1ubuntu1
    • 3.5.3-1ubuntu2
    • 3.5.3-1ubuntu3
    • 3.5.3-1ubuntu3.3
    Affected ranges
    • ECOSYSTEM: < 3.5.3-1ubuntu3.4

    Update to 3.5.3-1ubuntu3.4

  • edk2 Ubuntu:26.10

    Versions
    • 2025.11-3ubuntu7
    • 2025.11-3ubuntu8
    • 2026.05-2ubuntu1
    • 2026.05-2ubuntu2
    • 2026.05-2ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • edk2-hwe Ubuntu:26.10

    Versions
    • 2025.11-3ubuntu8
    • 2025.11-3ubuntu9
    • 2026.05-2ubuntu1
    • 2026.05-2ubuntu2
    • 2026.05-2ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • edk2 Ubuntu:26.04:LTS

    Versions
    • 2025.02-8ubuntu3
    • 2025.11-3ubuntu6
    • 2025.11-3ubuntu7
    • 2025.11-3ubuntu7.2
    • 2025.11-3ubuntu7.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • edk2-hwe Ubuntu:26.04:LTS

    Versions
    • 2025.11-3ubuntu6
    • 2025.11-3ubuntu8
    • 2025.11-3ubuntu8.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • openssl Ubuntu:26.04:LTS

    Versions
    • 3.5.3-1ubuntu2
    • 3.5.5-1ubuntu1
    • 3.5.5-1ubuntu3
    Affected ranges
    • ECOSYSTEM: < 3.5.5-1ubuntu3.2

    Update to 3.5.5-1ubuntu3.2

Original sources

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