Critical severity · published Jun 30, 2026
CVE-2026-8655
Multiple Memory overflow vulnerabilities leading to unpredictable or erroneous behavior and Denial of Service
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
Multiple Memory overflow vulnerabilities in NetScaler ADC and NetScaler Gateway leading to unpredictable or erroneous behavior and Denial of Service if NetScaler ADC is configured as an LB of type Oracle OR NetScaler ADC is configured as a DNS Proxy OR NetScaler ADC is configured as a DNS recursive resolver deployment
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NA
NetScaler ADC · Citrix
before 13.1-37.272; before 13.1-37.272; 13.1 before 13.1-63.18; 14.1 before 14.1-72.61; 14.1-66.68 · source: NVD
AD
ADC · NetScaler
14.1 before 72.61; 13.1 before 63.18; 14.1 FIPS before 72.61; 13.1 FIPS and NDcPP before 37.272 · source: vendor
GA
Gateway · NetScaler
14.1 before 72.61; 13.1 before 63.18 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8655
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8655
Vendor Advisory
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696604
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