CVE-2026-52736

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Source
https://cve.org/CVERecord?id=CVE-2026-52736
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52736.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-52736
Aliases
Published
2026-08-18T19:26:40.575Z
Modified
2026-08-19T12:10:40.781825478Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
ZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cache
Details

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the attacker to mutate coinbase scriptSig authentication data while retaining the transaction identifiers, merkle root, and block header hash, so the poisoned body fails later commitment validation but shares the canonical hash. In zebra-state/src/service.rs, queueandcommittononfinalizedstate recorded the hash in nonfinalizedblockwritesent_hashes before contextual validation completed and did not remove it when the write task rejected the body. When the honest body later arrived, the cached hash caused KnownBlock::WriteChannel duplicate handling to suppress it, leaving the node stuck one height behind until restart or reorganization. This issue is fixed in version 4.5.0.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-459"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52736.json"
}
References

Affected packages

Git / github.com/zcashfoundation/zebra

Affected ranges

Type
GIT
Repo
https://github.com/zcashfoundation/zebra
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
1440b43ca7df59aca948090d45117557b217a6cd
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "4.5.0"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

4.*
4.3.1
v1.*
v1.0.0
v1.0.0-alpha.0
v1.0.0-alpha.1
v1.0.0-alpha.10
v1.0.0-alpha.11
v1.0.0-alpha.12
v1.0.0-alpha.13
v1.0.0-alpha.14
v1.0.0-alpha.15
v1.0.0-alpha.16
v1.0.0-alpha.17
v1.0.0-alpha.18
v1.0.0-alpha.19
v1.0.0-alpha.2
v1.0.0-alpha.3
v1.0.0-alpha.4
v1.0.0-alpha.5
v1.0.0-alpha.6
v1.0.0-alpha.7
v1.0.0-alpha.8
v1.0.0-alpha.9
v1.0.0-beta.0
v1.0.0-beta.1
v1.0.0-beta.10
v1.0.0-beta.11
v1.0.0-beta.12
v1.0.0-beta.13
v1.0.0-beta.14
v1.0.0-beta.15
v1.0.0-beta.2
v1.0.0-beta.3
v1.0.0-beta.4
v1.0.0-beta.5
v1.0.0-beta.6
v1.0.0-beta.7
v1.0.0-beta.8
v1.0.0-beta.9
v1.0.0-rc.0
v1.0.0-rc.1
v1.0.0-rc.2
v1.0.0-rc.3
v1.0.0-rc.4
v1.0.0-rc.5
v1.0.0-rc.6
v1.0.0-rc.7
v1.0.0-rc.8
v1.0.0-rc.9
v1.0.1
v1.1.0
v1.2.0
v1.3.0
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.6.0
v1.6.1
v1.7.0
v1.8.0
v1.9.0
v2.*
v2.0.0
v2.0.0-rc.0
v2.0.1
v2.1.0
v2.2.0
v2.3.0
v2.4.0
v2.4.2
v2.5.0
v3.*
v3.0.0
v3.0.0-rc.0
v3.1.0
v4.*
v4.0.0
v4.1.0
v4.2.0
v4.3.0
v4.3.1
v4.4.0
v4.4.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52736.json"