Pre-authentication memory disclosure via malformed SAML request
Published Jun 30, 2026 · Updated Jun 30, 2026
Out-of-bounds read in Citrix NetScaler ADC and Gateway allows remote attackers to disclose process memory through crafted SAML AuthnRequests. The /saml/login XML attribute parser fails to treat newline whitespace as the terminator for unquoted values, reads beyond the request buffer, and returns adjacent bytes in the NSC_TASS cookie. Exposure requires a customer-managed SAML IdP configuration; affected builds include 13.1 before 13.1-63.18 and 14.1 before 14.1-72.61, plus specified ADC FIPS and NDcPP builds.
Summary
What happened
Out-of-bounds read in Citrix NetScaler ADC and Gateway allows remote attackers to disclose process memory through crafted SAML AuthnRequests. The /saml/login XML attribute parser fails to treat newline whitespace as the terminator for unquoted values, reads beyond the request buffer, and returns adjacent bytes in the NSC_TASS cookie. Exposure requires a customer-managed SAML IdP configuration; affected builds include 13.1 before 13.1-63.18 and 14.1 before 14.1-72.61, plus specified ADC FIPS and NDcPP builds.
The record
- CVE
- CVE-2026-8451
- Published
- Jun 30, 2026
- Updated
- Jun 30, 2026
- Vendor
- Cloud Software Group
- Product
- NetScaler Gateway
- Classifications
- CWE-125, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 30, 2026CVE publishedPublication date reported by the CVE source.
- Jun 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=13.1 <63.18
- Affected versionversion=14.1 <72.61
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- watchTowr NetScaler memory-overread detection artifact generatorfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- Post-disclosure exploitation attempts against NetScaler SAML IdP endpointsreported exploitation
Technologies
Your stack
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Your stack
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