Out-of-bounds Write Affecting wolfSSL/wolfssh 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-WOLFSSLWOLFSSH-17660729
- published28 Jun 2026
- disclosed25 Jun 2026
- creditUnknown
Introduced: 25 Jun 2026
CVE-2026-6679 (opens in a new tab)How to fix?
Upgrade wolfSSL/wolfssh to version 5.9.1 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the DTLS 1.3 ACK serialization process due to integer truncation when calculating the length of the ACK record-number list, which results in allocating an undersized buffer that can be overrun. An attacker can cause a heap buffer overflow by sending specially crafted DTLS 1.3 ACK messages before authentication is completed.