Integer Underflow (Wrap or Wraparound) Affecting wolfssl/wolfssl package, versions [,5.9.1)
Threat Intelligence
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-UNMANAGED-WOLFSSLWOLFSSL-15990751
- published12 Apr 2026
- disclosed10 Apr 2026
- creditUnknown
Introduced: 10 Apr 2026
NewCVE-2026-5188 (opens in a new tab)How to fix?
Upgrade wolfssl/wolfssl to version 5.9.1 or higher.
Overview
Affected versions of this package are vulnerable to Integer Underflow (Wrap or Wraparound) in the parsing of the Subject Alternative Name extension of X.509 certificates due to improper handling of entry lengths in the process. An attacker can cause incorrect processing of certificate data by supplying a malformed certificate with an entry length larger than the enclosing sequence, resulting in an internal length counter wrap. This is only exploitable if the original ASN.1 parsing implementation is enabled.