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CVE-2026-112112

CVE-2026-112112

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

An IPv6 FlowSpec validation bypass in the CZ.NIC BIRD Internet Routing Daemon allows an established BGP peer to inject FlowSpec rules matching destinations outside the address space authorized by the unicast-route validation procedure. With validation enabled on the receiving flow6 channel, BIRD fails to reject a destination prefix component with a nonzero offset, contrary to RFC 8956 section 5. It validates a reconstructed prefix with zero-filled skipped bits, although the original FlowSpec component can match a broader set of IPv6 addresses. Given a suitable unicast route from the peer, the rule can pass validation and, where export policy permits, be propagated to downstream peers. Downstream enforcement may cause unauthorized traffic filtering or redirection.

CVSS 2.3 · Low · EPSS 0.3%

Published
Updated

Stack: system

Affected products and versions

  • bird

    Versions
    • ≥ 2.0.9, ≤ 2.20.0: Affected (semver)
    • ≥ 3.0.0, ≤ 3.4.0: Affected (semver)

    No fix published

  • bird2 Debian:12

    Versions
    • 2.0.12-7
    • 2.14-1
    • 2.15-1
    • 2.15.1-1
    • 2.15.1-1.1
    • 2.16-1
    • 2.16.1-1
    • 2.17-1
    • 2.17.1-1
    • 2.17.2-1
    • 2.17.3-1
    • 2.17.3-2
    • 2.18-1
    • 2.18.1-1
    • 2.19.0-1
    • 2.19.1-1
    • 2.19.2-1
    • 2.20.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Debian:13

    Versions
    • 2.17.1-1
    • 2.17.1-1+deb13u1
    • 2.17.1-1+deb13u2
    • 2.17.2-1
    • 2.17.3-1
    • 2.17.3-2
    • 2.17.5-0+deb13u1
    • 2.18-1
    • 2.18.1-1
    • 2.19.0-1
    • 2.19.1-1
    • 2.19.2-1
    • 2.20.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Debian:14

    Versions
    • 2.17.1-1
    • 2.17.2-1
    • 2.17.3-1
    • 2.17.3-2
    • 2.18-1
    • 2.18.1-1
    • 2.19.0-1
    • 2.19.1-1
    • 2.19.2-1
    • 2.20.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird3 Debian:13

    Versions
    • 3.1.0-1
    • 3.1.4-1
    • 3.1.5-1
    • 3.1.5-2
    • 3.1.7-0+deb13u1
    • 3.2.0-1
    • 3.2.1-1
    • 3.3.0-1
    • 3.3.0-1~bpo13+1
    • 3.3.1-1
    • 3.3.2-1
    • 3.3.2-1~bpo13+1
    • 3.4.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird3 Debian:14

    Versions
    • 3.1.0-1
    • 3.1.4-1
    • 3.1.5-1
    • 3.1.5-2
    • 3.2.0-1
    • 3.2.1-1
    • 3.3.0-1
    • 3.3.0-1~bpo13+1
    • 3.3.1-1
    • 3.3.2-1
    • 3.3.2-1~bpo13+1
    • 3.4.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Ubuntu:20.04:LTS

    Versions
    • 2.0.5-1
    • 2.0.7-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Ubuntu:22.04:LTS

    Versions
    • 2.0.7-4.1
    • 2.0.8-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Ubuntu:24.04:LTS

    Versions
    • 2.0.12-7
    • 2.14-1
    • 2.14-1build1
    • 2.14-1build2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Ubuntu:26.10

    Versions
    • 2.18-1
    • 2.18.1-1
    • 2.19.0-1
    • 2.19.1-1
    • 2.19.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird3 Ubuntu:26.10

    Versions
    • 3.2.0-1
    • 3.2.1-1
    • 3.3.0-1
    • 3.3.1-1
    • 3.3.2-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird2 Ubuntu:26.04:LTS

    Versions
    • 2.17.1-1
    • 2.17.2-1
    • 2.17.3-1
    • 2.17.3-2
    • 2.18-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • bird3 Ubuntu:26.04:LTS

    Versions
    • 3.1.0-1
    • 3.1.4-1
    • 3.1.5-1
    • 3.1.5-2
    • 3.2.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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