# 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. CVE-2026-37457 is fixed in 7 products on 1 platform, first by frr 8.1-1ubuntu1.16, released May 4, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-37457 - Priority: High - CVSS: 7.5 (Moderate) - EPSS: 0.0039 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 1, 2026 - Weakness: Out-of-bounds Write - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-37457 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | frr Debian 12.15 (bookworm) | 8.4.4-1.1~deb12u2 | [DEBIAN-CVE-2026-37457](https://patchblox.com/security/data/fix/linux/debian-cve-2026-37457.md) | May 15, 2026 | | Linux | frr Debian 13.5 (trixie) | 10.3-3+deb13u1 | [DEBIAN-CVE-2026-37457](https://patchblox.com/security/data/fix/linux/debian-cve-2026-37457.md) | May 15, 2026 | | Linux | frr Debian 14 | 10.6.0-2 | [DEBIAN-CVE-2026-37457](https://patchblox.com/security/data/fix/linux/debian-cve-2026-37457.md) | May 15, 2026 | | Linux | frr RHEL 10 | 10.4.4-1.el10_2 | [RHSA-2026:24347](https://patchblox.com/security/data/fix/linux/rhsa-2026-24347.md) | Jun 24, 2026 | | Linux | frr RHEL 8 | 0:7.5.1-24.el8_10 | [RHSA-2026:24340](https://patchblox.com/security/data/fix/linux/rhsa-2026-24340.md) | Jun 24, 2026 | | Linux | frr RHEL 9 | 0:8.5.3-13.el9_8 | [RHSA-2026:24371](https://patchblox.com/security/data/fix/linux/rhsa-2026-24371.md) | Jun 24, 2026 | | Linux | frr Ubuntu 22.04.1 LTS (jammy) | 8.1-1ubuntu1.16 | [frr 8.1-1ubuntu1.16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-frr-8.1-1ubuntu1.16.md) | May 4, 2026 | | Linux | frr Ubuntu 24.04.5 LTS (noble) | 8.4.4-1.1ubuntu6.7 | [frr 8.4.4-1.1ubuntu6.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-frr-8.4.4-1.1ubuntu6.7.md) | May 4, 2026 | | Linux | frr Ubuntu 25.10 (questing) | 10.4.1-3ubuntu1.4 | [frr 10.4.1-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-frr-10.4.1-3ubuntu1.4.md) | May 4, 2026 | | Linux | frr Ubuntu 26.04.1 LTS (resolute) | 10.5.1-1ubuntu4.1 | [frr 10.5.1-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-frr-10.5.1-1ubuntu4.1.md) | May 4, 2026 | | Linux | frr almalinux 10 | 10.4.4-1.el10_2 | [ALSA-2026:24347](https://patchblox.com/security/data/fix/linux/alsa-2026-24347.md) | Jun 8, 2026 | | Linux | frr almalinux 8 | 7.5.1-24.el8_10 | [ALSA-2026:24340](https://patchblox.com/security/data/fix/linux/alsa-2026-24340.md) | Jun 8, 2026 | | Linux | frr almalinux 9 | 8.5.3-13.el9_8 | [ALSA-2026:24371](https://patchblox.com/security/data/fix/linux/alsa-2026-24371.md) | Jun 8, 2026 | | Linux | frr ol 10 | 0:10.4.4-1.el10_2 | [ELSA-2026-24347](https://patchblox.com/security/data/fix/linux/elsa-2026-24347.md) | Jul 16, 2026 | | Linux | frr ol 8 | 0:7.5.1-24.0.1.el8_10 | [ELSA-2026-24340](https://patchblox.com/security/data/fix/linux/elsa-2026-24340.md) | Jun 8, 2026 | | Linux | frr ol 9 | 0:8.5.3-13.el9_8 | [ELSA-2026-24371](https://patchblox.com/security/data/fix/linux/elsa-2026-24371.md) | Jun 23, 2026 | | Linux | frr rocky 10 | 0:10.4.4-1.el10_2 | [RLSA-2026:24347](https://patchblox.com/security/data/fix/linux/rlsa-2026-24347.md) | Jun 11, 2026 | | Linux | frr rocky 8 | 0:7.5.1-24.el8_10 | [RLSA-2026:24340](https://patchblox.com/security/data/fix/linux/rlsa-2026-24340.md) | Jun 11, 2026 | | Linux | frr rocky 9 | 0:8.5.3-13.el9_8 | [RLSA-2026:24371](https://patchblox.com/security/data/fix/linux/rlsa-2026-24371.md) | Jun 11, 2026 | | Linux | frr sles 15.6 | 8.5.7-150500.4.43.1 | [SUSE-SU-2026:2454-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2454-1.md) | Jun 18, 2026 | | Linux | frr sles 15.7 | 10.2.6-150700.3.10.1 | [SUSE-SU-2026:2457-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2457-1.md) | Jun 18, 2026 | | Linux | frr sles 16.0 | 10.2.6-160000.1.1 | [SUSE-SU-2026:22026-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22026-1.md) | Jun 3, 2026 | | Linux | frr-pythontools Ubuntu 22.04.1 LTS (jammy) | 8.1-1ubuntu1.16 | [frr-pythontools 8.1-1ubuntu1.16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-frr-pythontools-8.1-1ubuntu1.16.md) | May 4, 2026 | | Linux | frr-pythontools Ubuntu 24.04.5 LTS (noble) | 8.4.4-1.1ubuntu6.7 | [frr-pythontools 8.4.4-1.1ubuntu6.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-frr-pythontools-8.4.4-1.1ubuntu6.7.md) | May 4, 2026 | | Linux | frr-pythontools Ubuntu 25.10 (questing) | 10.4.1-3ubuntu1.4 | [frr-pythontools 10.4.1-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-frr-pythontools-10.4.1-3ubuntu1.4.md) | May 4, 2026 | | Linux | frr-pythontools Ubuntu 26.04.1 LTS (resolute) | 10.5.1-1ubuntu4.1 | [frr-pythontools 10.5.1-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-frr-pythontools-10.5.1-1ubuntu4.1.md) | May 4, 2026 | | Linux | frr-rpki-rtrlib Ubuntu 22.04.1 LTS (jammy) | 8.1-1ubuntu1.16 | [frr-rpki-rtrlib 8.1-1ubuntu1.16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-frr-rpki-rtrlib-8.1-1ubuntu1.16.md) | May 4, 2026 | | Linux | frr-rpki-rtrlib Ubuntu 24.04.5 LTS (noble) | 8.4.4-1.1ubuntu6.7 | [frr-rpki-rtrlib 8.4.4-1.1ubuntu6.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-frr-rpki-rtrlib-8.4.4-1.1ubuntu6.7.md) | May 4, 2026 | | Linux | frr-rpki-rtrlib Ubuntu 25.10 (questing) | 10.4.1-3ubuntu1.4 | [frr-rpki-rtrlib 10.4.1-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-frr-rpki-rtrlib-10.4.1-3ubuntu1.4.md) | May 4, 2026 | | Linux | frr-rpki-rtrlib Ubuntu 26.04.1 LTS (resolute) | 10.5.1-1ubuntu4.1 | [frr-rpki-rtrlib 10.5.1-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-frr-rpki-rtrlib-10.5.1-1ubuntu4.1.md) | May 4, 2026 | | Linux | frr-selinux RHEL 8 | 0:7.5.1-24.el8_10 | [RHSA-2026:24340](https://patchblox.com/security/data/fix/linux/rhsa-2026-24340.md) | Jun 24, 2026 | | Linux | frr-selinux RHEL 9 | 0:8.5.3-13.el9_8 | [RHSA-2026:24371](https://patchblox.com/security/data/fix/linux/rhsa-2026-24371.md) | Jun 24, 2026 | | Linux | frr-selinux almalinux 10 | 10.4.4-1.el10_2 | [ALSA-2026:24347](https://patchblox.com/security/data/fix/linux/alsa-2026-24347.md) | Jun 8, 2026 | | Linux | frr-selinux almalinux 8 | 7.5.1-24.el8_10 | [ALSA-2026:24340](https://patchblox.com/security/data/fix/linux/alsa-2026-24340.md) | Jun 8, 2026 | | Linux | frr-selinux almalinux 9 | 8.5.3-13.el9_8 | [ALSA-2026:24371](https://patchblox.com/security/data/fix/linux/alsa-2026-24371.md) | Jun 8, 2026 | | Linux | frr-selinux ol 10 | 0:10.4.4-1.el10_2 | [ELSA-2026-24347](https://patchblox.com/security/data/fix/linux/elsa-2026-24347.md) | Jul 16, 2026 | | Linux | frr-selinux ol 8 | 0:7.5.1-24.0.1.el8_10 | [ELSA-2026-24340](https://patchblox.com/security/data/fix/linux/elsa-2026-24340.md) | Jun 8, 2026 | | Linux | frr-selinux ol 9 | 0:8.5.3-13.el9_8 | [ELSA-2026-24371](https://patchblox.com/security/data/fix/linux/elsa-2026-24371.md) | Jun 23, 2026 | | Linux | frr-snmp Ubuntu 22.04.1 LTS (jammy) | 8.1-1ubuntu1.16 | [frr-snmp 8.1-1ubuntu1.16](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-frr-snmp-8.1-1ubuntu1.16.md) | May 4, 2026 | | Linux | frr-snmp Ubuntu 24.04.5 LTS (noble) | 8.4.4-1.1ubuntu6.7 | [frr-snmp 8.4.4-1.1ubuntu6.7](https://patchblox.com/security/data/fix/linux/ubuntu-noble-frr-snmp-8.4.4-1.1ubuntu6.7.md) | May 4, 2026 | | Linux | frr-snmp Ubuntu 25.10 (questing) | 10.4.1-3ubuntu1.4 | [frr-snmp 10.4.1-3ubuntu1.4](https://patchblox.com/security/data/fix/linux/ubuntu-questing-frr-snmp-10.4.1-3ubuntu1.4.md) | May 4, 2026 | | Linux | frr-snmp Ubuntu 26.04.1 LTS (resolute) | 10.5.1-1ubuntu4.1 | [frr-snmp 10.5.1-1ubuntu4.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-frr-snmp-10.5.1-1ubuntu4.1.md) | May 4, 2026 | | Linux | frr10 RHEL 9 | 0:10.4.3-3.el9_8 | [RHSA-2026:24370](https://patchblox.com/security/data/fix/linux/rhsa-2026-24370.md) | Jun 24, 2026 | | Linux | frr10 almalinux 9 | 10.4.3-3.el9_8 | [ALSA-2026:24370](https://patchblox.com/security/data/fix/linux/alsa-2026-24370.md) | Jun 8, 2026 | | Linux | frr10 ol 9 | 0:10.4.3-3.el9_8 | [ELSA-2026-24370](https://patchblox.com/security/data/fix/linux/elsa-2026-24370.md) | Jun 24, 2026 | | Linux | frr10 rocky 9 | 0:10.4.3-3.el9_8 | [RLSA-2026:24370](https://patchblox.com/security/data/fix/linux/rlsa-2026-24370.md) | Jun 11, 2026 | | Linux | frr10-selinux RHEL 9 | 0:10.4.3-3.el9_8 | [RHSA-2026:24370](https://patchblox.com/security/data/fix/linux/rhsa-2026-24370.md) | Jun 24, 2026 | | Linux | frr10-selinux almalinux 9 | 10.4.3-3.el9_8 | [ALSA-2026:24370](https://patchblox.com/security/data/fix/linux/alsa-2026-24370.md) | Jun 8, 2026 | | Linux | frr10-selinux ol 9 | 0:10.4.3-3.el9_8 | [ELSA-2026-24370](https://patchblox.com/security/data/fix/linux/elsa-2026-24370.md) | Jun 24, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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