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CVE-2026-3055: Citrix NetScaler Out-of-Bounds Read Vulnerability

criticalknown exploitedpublic exploitCVE-2026-3055
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.

CSIRTS triage

vendor: Citrixproduct: NetScaler ADCOther
What
Citrix NetScaler ADC contains an out-of-bounds reads vulnerability leading to memory overread.
Who is affected
Deployments of Citrix NetScaler ADC configured as a SAML IDP.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Update to the latest version of Citrix NetScaler ADC.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-03-30
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-3055

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-3055coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Citrix NetScaler Out-of-Bounds

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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