CVE-2026-123555
📛 CVE Title
Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures
Description
Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- VulnCheck
- CVSS severity
- HIGH
- CVSS score
- 8.7 / 10
- CVSS vector
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- Effective score
- 8.7 / 10 HIGH source: CNA overview
- CWE(s)
-
CWE-755 - Reserved
- 2026-11-06
- Published
- 2026-11-08 01:37 UTC
- Last updated
- 2026-11-08 01:37 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123555.json
- Linked Threat
- CVE-2026-123555 — Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-119440 - Assigner
- VulnCheck
- Published
- Nov 8, 2026, 1:37:57 AM
- Updated
- Nov 8, 2026, 1:37:57 AM
- EUVD base score (CVSS 4.0)
-
8.7 / 10
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 - EUVD-reported EPSS
- 0.0000
- Vendors
- ZcashFoundation
- Products
-
zebra (2.3.0 <7.0.0)zebra (1.0.0-beta.46 <18.0.0)
- Aliases
-
GHSA-cwcw-qfgm-5r6m
ENISA description: Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.
EUVD references (3)
Affected products (2)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| ZcashFoundation | zebra |
2.3.0 (affected),
7.0.0 (unaffected)
|
— |
| ZcashFoundation | zebra |
1.0.0-beta.46 (affected),
18.0.0 (unaffected)
|
— |
Vendor references (3)
References embedded in the original CVE record by the assigning CNA.
- GitHub Security Advisory (GHSA-jq45-ghw5-v37x) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures third-party-advisory
MITRE references (3) cveawg.mitre.org
Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.
- Patch Commit patch
- GitHub Security Advisory (GHSA-jq45-ghw5-v37x) vendor-advisory
- VulnCheck Advisory: Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures third-party-advisory
Web references (0)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
No web references attached yet.
Remediations (10)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blogs.oracle.com
For more information about the Critical Security Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.
2026-11-08 10:24 UTC -
web:cvedatabase.com
Search and analyze CVE vulnerabilities with instant access to CVSS scores, affected products, and remediation guidance.
2026-11-08 10:24 UTC -
web:cybersecuritynews.com
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued Binding Operational Directive (BOD) 26-04, titled "Prioritizing Security Updates Based on Risk," compelling all Federal Civilian Executive Branch (FCEB) agencies to remediate the most dangerous known exploited vulnerabilities within just three calendar days.
2026-11-08 10:24 UTC -
web:cyberupdates365.com
Track critical CVE vulnerabilities 2026 with verified enterprise patch guides. Fix zero-days across VMware, WordPress, Windows, and cloud infrastructure.
2026-11-08 10:24 UTC -
web:senserva.com
Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.
2026-11-08 10:24 UTC -
web:www.aikido.dev
CVE remediation is fixing known flaws in the software you run. Why upgrading often fails, what remediation actually involves, and how backporting fixes it.
2026-11-08 10:24 UTC -
web:www.bleepingcomputer.com
Today is Microsoft's October 2026 Patch Tuesday, with security updates addressing a record-breaking 1,411 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.
2026-11-08 10:24 UTC -
web:www.openhands.dev
Compare 8 automated vulnerability remediation tools for 2026 on fixes, prioritization, integrations, and deployment control.
2026-11-08 10:24 UTC -
web:www.oracle.com
This Critical Patch Update contains 1295 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at October 2026 Critical Patch Update: Executive Summary and Analysis.
2026-11-08 10:24 UTC -
web:www.oracle.com
Prior Critical Patch Update and Critical Security Patch Update advisories should be reviewed for information regarding earlier published security patches. Refer to Critical Patch Updates, Critical Security Patch Updates, Security Alerts and Bulletins for information about Oracle Security advisories.
2026-11-08 10:24 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-123555.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:cargo/zebrad",
"product": "zebra",
"vendor": "ZcashFoundation",
"versions": [
{
"lessThan": "7.0.0",
"status": "affected",
"version": "2.3.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "7.0.0",
"versionType": "semver"
}
]
},
{
"defaultStatus": "unaffected",
"packageURL": "pkg:cargo/zebra-consensus",
"product": "zebra",
"vendor": "ZcashFoundation",
"versions": [
{
"lessThan": "18.0.0",
"status": "affected",
"version": "1.0.0-beta.46",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "18.0.0",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0.0",
"versionStartIncluding": "2.3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*",
"versionEndExcluding": "18.0.0",
"versionStartIncluding": "1.0.0-beta.46",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "x15-eth"
},
{
"lang": "en",
"type": "coordinator",
"value": "mpguerra"
},
{
"lang": "en",
"type": "remediation developer",
"value": "conradoplg"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "upbqdn"
}
],
"datePublic": "2026-10-22T00:00:00.000Z",
"descriptions": [
{
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"value": "Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS"
},
{
"cvssV3_1": {
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"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-755",
"description": "Improper Handling of Exceptional Conditions",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"shortName": "VulnCheck"
},
"references": [
{
"name": "GitHub Security Advisory (GHSA-jq45-ghw5-v37x)",
"tags": [
"vendor-advisory"
],
"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x"
},
{
"name": "Patch Commit",
"tags": [
"patch"
],
"url": "https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a"
},
{
"name": "VulnCheck Advisory: Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures"
}
],
"title": "Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures",
"x_generator": {
"engine": "vulncheck-endgame"
}
}
},
"cveMetadata": {
"assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
"assignerShortName": "VulnCheck",
"cveId": "CVE-2026-123555",
"datePublished": "2026-11-08T01:37:57.593Z",
"dateReserved": "2026-11-06T00:50:45.482Z",
"dateUpdated": "2026-11-08T01:37:57.593Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}