What’s Vulnerable › Vulnerabilities

CVE-2019-9578

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-03-05 · updated 2026-06-17
• Weakness: CWE-908

Description

In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.

Affected products

• Yubico Libu2F-Host: before 1.1.8 — fixed in 1.1.8

How to fix

Upgrade to a fixed version: Yubico Libu2F-Host 1.1.8. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00018.html
• https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part2/
• https://developers.yubico.com/libu2f-host/Release_Notes.html
• https://github.com/Yubico/libu2f-host/commit/e4bb58cc8b6202a421e65f8230217d8ae6e16eb5
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GMA4H6AZFYIR3LA5VKKEJZNCCIVMUCFQ/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S4YCFMSNMXZ7XC4U6WXPQA7JCXC6VOAJ/
• https://security.gentoo.org/glsa/202004-15
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00018.html
• https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part2/
• https://developers.yubico.com/libu2f-host/Release_Notes.html

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