CVE-2026-88776
HIGH 8.8Memory overflow vulnerability vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to unpredictable or erroneous behavior or Denial of Service
Severe if exploited (CVSS 8.8), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.7%chance of exploitation in 30 days · 54th percentile
Impact if exploited
8.8CVSS 4.0 · HIGH
- ConfidentialityLow
- IntegrityLow
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
Search for new PoCs
Search GitHub now — results may be empty or unverified.
Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.
Data snapshot:
Affected
Vendors Citrix Netscaler Citrix
Products Adc Gateway Netscaler Application Delivery Controller Netscaler Gateway
Weakness (CWE)
- CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
References and research data (JSON)
Unverified PoC candidates
Catalogue matches for further research. These repositories have not been validated as working exploits.
2 candidates
- https://github.com/Scyrix-LLC/CVE-2026-88776
Write-up for CVE-2026-88776
PoC-in-GitHub · CVE-2026-88776
PoC-in-GitHub · CVE-2026-88776 · Updated 2026-10-09T19:50:58Z - https://github.com/CompleTetech-Security/netscaler-cve-2026-88776-check
Offline NetScaler ADC / Gateway evidence checker for CVE-2026-88776. Reported firmware and configuration evidence. Standalone Python; JSON/CSV/HTML reports; no exploit payloads.
PoC-in-GitHub · CVE-2026-88776
PoC-in-GitHub · CVE-2026-88776 · Updated 2026-10-26T05:06:57Z
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Citrix | Netscaler Application Delivery Controller | ≥ 13.1 and < 13.1-64.23 |
| Citrix | Netscaler Application Delivery Controller | ≥ 13.1 and < 13.1.37.279 |
| Citrix | Netscaler Application Delivery Controller | ≥ 13.1 and < 13.1.37.279 |
| Citrix | Netscaler Application Delivery Controller | ≥ 14.1 and < 14.1-73.37 |
| Citrix | Netscaler Application Delivery Controller | ≥ 14.1-66.68 and ≤ 14.1-73.37 |
| Citrix | Netscaler Gateway | ≥ 13.1 and < 13.1-64.23 |
| Citrix | Netscaler Gateway | ≥ 14.1 and < 14.1-73.37 |
All CVSS metrics
- HIGH 8.8 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N - HIGH 8.8 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/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 - CRITICAL 9.8 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
Advisories
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096 CVE record · NetScaler · Updated 2026-09-27T16:36:40.034Z
NVD · CVE-2026-88776 · Updated 2026-09-29T17:17:11.850 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-87971 EUVD · EUVD-2026-87971