Description
Yubico libu2f-host 1.1.6 contains unchecked buffers in devs.c, which could enable a malicious token to exploit a buffer overflow. An attacker could use this to attempt to execute malicious code using a crafted USB device masquerading as a security token on a computer where the affected library is currently in use. It is not possible to perform this attack with a genuine YubiKey.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libu2f-host | 1.1.7-1 | — |
| Debian 13 | libu2f-host | 1.1.7-1 | — |
| Debian 12 | libu2f-host | 1.1.7-1 | — |
| Debian 9 | libu2f-host | 1.1.2-2+deb9u1 | DSA-4389-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | libu2f-host | 1.1.4-1ubuntu0.1 | — |
| Ubuntu 16.04 LTS | libu2f-host | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | libu2f-host | 1.1.10-3.9.1 | SUSE-SU-2021:1755-1 |
| SLES 15 SP2 | libu2f-host | 1.1.10-3.9.1 | SUSE-SU-2021:1755-1 |
| SLES 15 | libu2f-host | 1.1.6-3.3.3 | SUSE-SU-2019:1340-1 |
| SLES 12 SP4 | libu2f-host | 1.1.6-3.5.1 | SUSE-SU-2019:1749-1 |
| SLES 12 SP4 | pam_u2f | 1.0.8-3.3.1 | SUSE-SU-2019:1749-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | libu2f-host | 1.1.6-3.5.1 | SUSE-SU-2019:1749-1 |
| SLES for SAP 12 SP4 | pam_u2f | 1.0.8-3.3.1 | SUSE-SU-2019:1749-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.3 | libu2f-host | 1.1.10-3.9.1 | openSUSE-SU-2021:1755-1 |
| openSUSE Leap 15.2 | libu2f-host | 1.1.10-lp152.4.3.1 | openSUSE-SU-2021:0799-1 |
| openSUSE Leap 15.1 | libu2f-host | 1.1.6-lp151.2.3.1 | openSUSE-SU-2019:1475-1 |
| openSUSE Leap 15.0 | libu2f-host | 1.1.6-lp151.2.3.1 | openSUSE-SU-2019:1475-1 |
Advisories 7
- DSA-4389-1 libu2f-host - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:1755-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1749-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0799-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1755-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1475-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1340-1 Security update for libu2f-host SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://seclists.org/bugtraq/2019/Feb/23
- https://www.debian.org/security/2019/dsa-4389
- https://www.yubico.com/support/security-advisories/ysa-2019-01/
- https://developers.yubico.com/libu2f-host/Release_Notes.html
- https://blog.inhq.net/posts/yubico-libu2f-host-vuln-part1/
- GLSA-202004-15 vendor-advisory