HIGH 7.5 Microsoft
CVE-2026-37457
An off-by-one out-of-bounds write vulnerability in the bgp_flowspec_op_decode() function (bgpd/bgp_flowspec_util.c) of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted FlowSpec component.
Microsoft Security Update 2026-May: An off-by-one out-of-bounds write vulnerability in the bgp_flowspec_op_decode() function (bgpd/bgp_flowspec_util.c) of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted FlowSpec component.
Affected Products
- cbl2 frr 8.5.5-5 on CBL Mariner 2.0
- azl3 frr 10.5.0-2 on Azure Linux 3.0
- azl3 frr 10.5.0-3 on Azure Linux 3.0
- azl3 frr 10.5.4-1 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-37457
- https://nvd.nist.gov/vuln/detail/CVE-2026-37457
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-05-12 via Microsoft. Affected: cbl2 frr 8.5.5-5 on CBL Mariner 2.0, azl3 frr 10.5.0-2 on Azure Linux 3.0, azl3 frr 10.5.0-3 on Azure Linux 3.0 and 1 more.
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