Integer Underflow (Wrap or Wraparound) Affecting krb5 package, versions [0,]
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-KRB5-16321399
- published29 Apr 2026
- disclosed28 Apr 2026
- creditCem Onat Karagun
Introduced: 28 Apr 2026
NewCVE-2026-40356 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Integer Underflow (Wrap or Wraparound) in the parse_message() function when the NegoEx mechanism is registered in /etc/gss/mech. An attacker can cause process termination by sending specially crafted requests with a short header_len that trigger an integer underflow and out-of-bounds read.