Integer Overflow or Wraparound Affecting openssh package, versions <1:8.1p1-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
2.23% (83rd percentile)

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  • Snyk IDSNYK-ECHOLATEST-OPENSSH-17993896
  • published16 Jul 2026
  • disclosed9 Oct 2019

Introduced: 9 Oct 2019

CVE-2019-16905  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Echo:latest openssh to version 1:8.1p1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

OpenSSH 7.7 through 7.9 and 8.x before 8.1, when compiled with an experimental key type, has a pre-authentication integer overflow if a client or server is configured to use a crafted XMSS key. This leads to memory corruption and local code execution because of an error in the XMSS key parsing algorithm. NOTE: the XMSS implementation is considered experimental in all released OpenSSH versions, and there is no supported way to enable it when building portable OpenSSH.

CVSS Base Scores

version 3.1