CVE-2026-123563
📛 CVE Title
Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse
Description
Devalue before 5.9.3 contains a validation bypass vulnerability that allows custom ArrayBuffer revivers to skip typed-array allocation checks in the parse function. Attackers can supply very small crafted input processed by a malformed ArrayBuffer reviver to allocate massive ArrayBuffers, causing memory exhaustion and denial of service.
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-789 - Reserved
- 2026-11-06
- Published
- 2026-11-08 01:38 UTC
- Last updated
- 2026-11-08 01:38 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/123xxx/CVE-2026-123563.json
- Linked Threat
- CVE-2026-123563 — Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse
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-2026-119448
EUVD enrichment is queued; refresh the page in a few seconds.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| sveltejs | devalue |
0 (affected),
5.9.3 (unaffected)
|
— |
Vendor references (2)
References embedded in the original CVE record by the assigning CNA.
- GitHub Security Advisory (GHSA-r9w8-h9r3-54w4) vendor-advisory
- VulnCheck Advisory: Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse 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: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:endpointweekly.com
All 633 CVEs from September 2026 Patch Tuesday — searchable, filterable, with plain-English IT admin notes on every vulnerability. Includes CVE - 2026 -81963, the exploited Windows Update Stack EoP, and the five CVEs KB5124008 does not fix .
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:support.esri.com
The issues resolved by these patches are listed in the Issues addressed with this patch section below. As part of the patch installation, the ArcGIS Server service is stopped and restarted. The restart may take several minutes depending on the number of services published on the ArcGIS Server site. This patch can be uninstalled as outlined in the Uninstalling this patch on Windows and ...
2026-11-08 10:24 UTC -
web:support.servicenow.com
What you need to know: On September 24, 2026 , ServiceNow issued CVE - 2026 -86857, CVE - 2026 -86858, CVE - 2026 -13016, CVE - 2026 -86859, and CVE - 2026 -86860. Each of these security issues was identified through internal security testing, customer security assessments, or reports submitted through ServiceNow's responsible disclosure and bug bounty programs and was remediated independently. For security ...
2026-11-08 10:24 UTC -
web:vulmon.com
Vulnerability Summary Devalue versions prior to 5.9.3 have a validation bypass flaw. This allows custom ArrayBuffer revivers to bypass typed-array allocation checks within the parse function. Attackers can provide small, specially crafted input to a malformed ArrayBuffer reviver. This enables the allocation of very large ArrayBuffers, resulting in memory exhaustion and denial of service.
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.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.ptc.com
To stay informed, customers are urged to monitor security communications from [email protected] and regularly review the PTC Trust Center blog and eSupport Article (CS473270) for the latest updates, patch information, indicators of compromise (IOCs), remediation guidance, and other technical details.
2026-11-08 10:24 UTC -
web:www.vulncheck.com
CVE-2026-123563 | null | Affecting devalue >= 0, < 5.9.3 | Severity: HIGH | CVSS: 8.7
2026-11-08 10:24 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-123563.json.
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"packageURL": "pkg:npm/devalue",
"product": "devalue",
"vendor": "sveltejs",
"versions": [
{
"lessThan": "5.9.3",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.9.3",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"versionEndExcluding": "5.9.3",
"vulnerable": true
}
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"negate": false,
"operator": "OR"
}
]
}
],
"credits": [
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}
],
"datePublic": "2026-09-18T00:00:00.000Z",
"descriptions": [
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}
],
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"problemTypes": [
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"descriptions": [
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],
"url": "https://github.com/sveltejs/devalue/security/advisories/GHSA-r9w8-h9r3-54w4"
},
{
"name": "VulnCheck Advisory: Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse",
"tags": [
"third-party-advisory"
],
"url": "https://www.vulncheck.com/advisories/devalue-before-5.9.3-typed-array-allocation-validation-bypass-via-parse"
}
],
"title": "Devalue before 5.9.3 Typed-Array Allocation Validation Bypass via parse",
"x_generator": {
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"cveMetadata": {
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"datePublished": "2026-11-08T01:38:03.120Z",
"dateReserved": "2026-11-06T00:50:45.483Z",
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"state": "PUBLISHED"
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