2.3

CVE-2026-112112: nic bird

CVSS: 2.3v4.0LowReceived
AliasesDEBIAN-CVE-2026-112112
Published 18-10-2026Last modified 18-10-2026
Open JSON

Vulnerability summary

CVE-2026-112112 is a low (CVSS 2.3) vulnerability in nic bird.

Overall risk
9/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.3/10
010
Low · v4.0 (CVE.org)
EPSS score
Not scored
0%100%
No EPSS score yet
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-10-2026
    PublishedVulnerability first disclosed.

Description

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 metrics

2 scores · 2 sources · 1 version

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • bird2All versions (No fix recorded)
  • bird3All versions (No fix recorded)
Nic1 product
  • bird≥ 2.0.9, ≤ 2.20.0 | ≥ 3.0.0, ≤ 3.4.0

2 vendors · 3 products

References

5 links