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Citrix · Memory corruption

Citrix NetScaler Out-of-Bounds Read Vulnerability

CVE-2026-3055

What this means

This is rated critical severity (9.3 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Citrix Netscaler Application Delivery Controller and Citrix Netscaler Gateway are in your estate, and treat that as the priority.

Full vendor description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

Scoring and exploitation

9.3/ 10
CVSS 4.0 base scoreCritical

Exploitable over the network without any account, and no one has to click or open anything. High impact on confidentiality, integrity and availability; low on subsequent confidentiality, subsequent integrity and subsequent availability.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityLowAC:L
Attack requirementsNoneAT:N
Privileges requiredNonePR:N
User interactionNoneUI:N

Impact

Longer bar: more harm

ConfidentialityHighVC:H
IntegrityHighVI:H
AvailabilityHighVA:H
Subsequent confidentialityLowSC:L
Subsequent integrityLowSI:L
Subsequent availabilityLowSA:L
Elevated attack likelihood (~91.5% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
Citrix NetScaler

Weaknesses

CWE-125

Affected products ()

  • Citrix Netscaler Application Delivery Controller
  • Citrix Netscaler Gateway
Show the raw CPE strings (4)
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*
  • cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*

References

3 links from the CVE record, grouped by site; the vendor's advisory comes first.

Related feed events

  • Citrix NetScaler Out-of-Bounds Read Vulnerability

    Type Vulnerability

    (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… known-exploited catalogue reports…

    Next step: Confirm whether Citrix is in your estate.

    Who's reporting

    1 of 3 perspectives

    Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal

    Only official coverage so far. Treat as an early signal.

    Citrix
    CVE-2026-3055