CVE-2026-109363

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Source
https://cve.org/CVERecord?id=CVE-2026-109363
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109363.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-109363
Aliases
  • GHSA-h5rr-8pqv-grp9
Published
2026-10-12T16:05:41Z
Modified
2026-10-28T02:31:08Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction
Details

ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation during UnminedTx construction treats re-serialization of the Orchard bundle as infallible, so the resulting error trips an expect that aborts zebrad. Unauthenticated peers can send a single pre-handshake tx message to crash the node, and can repeat this after each restart.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-617"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109363.json"
}
References

Affected packages

Git / github.com/zcashfoundation/zebra

Affected ranges

Type
GIT
Repo
https://github.com/zcashfoundation/zebra
Events
Introduced
aedb094dc6dd13a0a565947e7ab4466a8b149d39
Fixed
e3eef2f37c35127ad1769f19a1ebc7eaa5d5d291
Fixed
008abac5c99e872f283450d596d95e37851df49a
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "6.4.0"
                },
                {
                    "fixed": "6.4.2"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "008abac5c99e872f283450d596d95e37851df49a"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

v6.*
v6.4.0
v6.4.1
zebra-chain-v13.*
zebra-chain-v13.0.0
zebra-consensus-v16.*
zebra-consensus-v16.0.0
zebra-network-v13.*
zebra-network-v13.0.0
zebra-node-services-v11.*
zebra-node-services-v11.0.0
zebra-rpc-v17.*
zebra-rpc-v17.0.0
zebra-script-v12.*
zebra-script-v12.0.0
zebra-state-v14.*
zebra-state-v14.0.0
zebra-utils-v10.*
zebra-utils-v10.0.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109363.json"