CVE-2026-37457

An off-by-one out-of-bounds write vulnerability in the bgpflowspecopdecode() function (bgpd/bgpflowspec_util.c) of FRRouting (FRR) stable/10.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted FlowSpec component.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37457.json",
    "cna_assigner": "mitre"
}

References

Affected packages

Git / github.com/frrouting/frr

Affected ranges

Type

GIT

Repo

https://github.com/frrouting/frr

Events

Introduced

d5bec7b08149e9811013ba771ae6d557b396b380

Fixed

0e6882bc72c0278988a47b2f0f73b7a91099a25c

Database specific

{
    "cpe": "cpe:2.3:a:frrouting:frrouting:10.0:-:*:*:*:*:*:*",
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "10.0-NA"
        },
        {
            "last_affected": "10.0-NA"
        }
    ]
}

Affected versions

10.*

10.0-NA

base_10.*

base_10.1

base_10.2

base_10.3

base_10.4

base_10.5

base_10.6

frr-10.*

frr-10.0-dev

frr-10.2-dev

frr-10.3-dev

frr-10.4-dev

frr-10.5-dev

frr-10.6.0-dev

frr-10.7.0-dev

Database specific

vanir_signatures_modified

"2026-07-22T03:57:17Z"

vanir_signatures

[
    {
        "signature_type": "Line",
        "target": {
            "file": "bgpd/bgp_flowspec_util.c"
        },
        "deprecated": false,
        "source": "https://github.com/frrouting/frr/commit/0e6882bc72c0278988a47b2f0f73b7a91099a25c",
        "id": "CVE-2026-37457-62a14b92",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "70203518157991788059589249358584491773",
                "339493298477160008444121123548945795090",
                "220060263767998761351801902403723841861",
                "138796088628398828774366363276051391257",
                "323869506605232209770712306872727708856",
                "240045892448241534760224328400224736540",
                "205751541838883250232327288654861921512",
                "89670831658012169823176879374640645846",
                "299629851774576051021819406685035984563"
            ],
            "threshold": 0.9
        }
    },
    {
        "signature_type": "Function",
        "target": {
            "file": "bgpd/bgp_flowspec_util.c",
            "function": "bgp_flowspec_op_decode"
        },
        "deprecated": false,
        "source": "https://github.com/frrouting/frr/commit/0e6882bc72c0278988a47b2f0f73b7a91099a25c",
        "id": "CVE-2026-37457-6b966e94",
        "signature_version": "v1",
        "digest": {
            "function_hash": "311707315261189954997073606686648123025",
            "length": 1995.0
        }
    },
    {
        "signature_type": "Function",
        "target": {
            "file": "bgpd/bgp_flowspec_util.c",
            "function": "bgp_flowspec_bitmask_decode"
        },
        "deprecated": false,
        "source": "https://github.com/frrouting/frr/commit/0e6882bc72c0278988a47b2f0f73b7a91099a25c",
        "id": "CVE-2026-37457-fc0d213c",
        "signature_version": "v1",
        "digest": {
            "function_hash": "223631915427432894996681863711670348562",
            "length": 2073.0
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-37457.json"