Off-by-One Out-of-Bounds Write Vulnerability in FRRouting BGP Component
CVE-2026-37457

7.5HIGH

Key Information:

Vendor

FRRouting

Status
FRRouting
Vendor
CVE Published:
1 May 2026

What is CVE-2026-37457?

A vulnerability exists in the bgp_flowspec_op_decode() function of the FRRouting (FRR) software, specifically within the implementation found in bgpd/bgp_flowspec_util.c. This issue is triggered when attackers provide a malicious FlowSpec component, allowing for an off-by-one out-of-bounds write. Exploiting this vulnerability could lead to a Denial of Service condition, impacting the stability and availability of the affected FRRouting systems. It is crucial for users of FRRouting to apply the latest security updates to mitigate this risk.

References

https://github.com/FRRouting/frr/commit/0e6882bc72c027898...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.