CVE-2026-112112Low· 2.3▾ SunlitAn 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. W…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 12.6 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
0.3% → 0.3%
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.
BIRD >= 2.0.9 <= 2.20.0BIRD >= 3.0.0 <= 3.4.0Apply upstream commit 7cf75587b6f38b87849fe192bf5dfd124b7702bc or a verified branch-specific backport. The fix requires the original IPv6 destination-prefix component to have offset zero before it can pass FlowSpec validation. The first fixed release has not yet been verified.
Connected by shared product, vendor, weakness, or advisory.
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