Vulnerability Details CVE-2026-40356
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 39.5%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2026-40356
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cpe:2.3:a:mit:kerberos_5:1.18.0
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cpe:2.3:a:mit:kerberos_5:1.18.1
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cpe:2.3:a:mit:kerberos_5:1.18.2
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cpe:2.3:a:mit:kerberos_5:1.18.3
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cpe:2.3:a:mit:kerberos_5:1.18.4
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cpe:2.3:a:mit:kerberos_5:1.19.0
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cpe:2.3:a:mit:kerberos_5:1.19.1
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cpe:2.3:a:mit:kerberos_5:1.19.2
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cpe:2.3:a:mit:kerberos_5:1.19.3
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cpe:2.3:a:mit:kerberos_5:1.19.4
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cpe:2.3:a:mit:kerberos_5:1.20
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cpe:2.3:a:mit:kerberos_5:1.20.1
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cpe:2.3:a:mit:kerberos_5:1.20.2
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cpe:2.3:a:mit:kerberos_5:1.21
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cpe:2.3:a:mit:kerberos_5:1.21.1
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cpe:2.3:a:mit:kerberos_5:1.21.2