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CVE-2026-13474— Denial of service via malformed HTTP/2 requests

Quick assessment

Affected
NetScaler ADC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Citrix NetScaler Application Delivery Controller是美国Citrix公司的一个功能全面、高性能且灵活的应用交付平台，适用于对应用性能和安全性有严苛要求的企业。 Citrix NetScaler Application Delivery Controller和Citrix NetScaler Gateway存在资源管理错误漏洞，该漏洞源于HTTP/2畸形请求可能导致拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
NetScaler ADC 14.1< 72.61 affected
13.1< 63.18 affected
14.1 FIPS< 72.61 affected
13.1 FIPS and NDcPP< 37.272 affected
NetScaler Gateway 14.1< 72.61 affected
13.1< 63.18 affected
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I. Basic Information for CVE-2026-13474

Vulnerability Information
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Vulnerability Title
Denial of service via malformed HTTP/2 requests
Source: CVE Program / CVE List V5
Vulnerability Description
Denial of service via malformed HTTP/2 requests in NetScaler ADC and NetScaler Gateway if HTTP/2 is enabled in HTTP Profile and associated with the virtual server (of type LB, CS, VPN) or the service configured on NetScaler
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Citrix NetScaler Application Delivery Controller 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Citrix NetScaler Application Delivery Controller是美国Citrix公司的一个功能全面、高性能且灵活的应用交付平台，适用于对应用性能和安全性有严苛要求的企业。 Citrix NetScaler Application Delivery Controller和Citrix NetScaler Gateway存在资源管理错误漏洞，该漏洞源于HTTP/2畸形请求可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
NetScaler ADC 14.1 ~ 72.61 -
NetScaler Gateway 14.1 ~ 72.61 -

II. Public POCs for CVE-2026-13474

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III. Intelligence Information for CVE-2026-13474

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Vendor Advisories for CVE-2026-13474 (1)

Same Patch Batch · NetScaler · 2026-06-30 · 6 CVEs total

CVE-2026-8452 8.8 HIGH Memory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of
CVE-2026-10817 Insufficient input validation leading to memory overread
CVE-2026-10816 Arbitrary File Read (Unauthenticated)
CVE-2026-8655 Multiple Memory overflow vulnerabilities leading to unpredictable or erroneous behavior an
CVE-2026-8451 Insufficient input validation leading to memory overread

IV. Related Vulnerabilities

Same product: ADC
Same vendor: NetScaler
Same weakness: CWE-401

V. Comments for CVE-2026-13474

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