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Fencer Vulns
high 7.5

CVE-2019-9578 json

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.

published 2019-03-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-18949

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • yubico libu2f-host 1.1.8
  • libu2f-host Debian 14, Debian 13, Debian 12 1.1.9-1

debian advisories DEBIAN-CVE-2019-9578

  • libu2f-host SLE Module for Basesystem 15 SP3, SLE Module for Basesystem 15 SP2 1.1.10-3.9.1
  • pam_u2f SLES 12 SP4, SLED 12 SP4, SLE Module for Basesystem 15 SP1 +2 more 1.0.8-3.3.1
  • libu2f-host SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 1.1.6-3.6.1
  • libu2f-host SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 1.1.6-3.5.1

suse advisories SUSE-SU-2021:1755-1SUSE-SU-2019:1750-1SUSE-SU-2019:1749-1

  • libu2f-host openSUSE Leap 15.3 1.1.10-3.9.1
  • libu2f-host openSUSE Leap 15.2 1.1.10-lp152.4.3.1
  • pam_u2f openSUSE Leap 15.0 1.0.8-lp150.7.1
  • libu2f-host openSUSE Leap 15.0 1.1.6-lp150.10.1
  • pam_u2f openSUSE Leap 15.1 1.0.8-lp151.2.3.1
  • libu2f-host openSUSE Leap 15.1 1.1.6-lp151.2.6.1

opensuse advisories openSUSE-SU-2021:1755-1openSUSE-SU-2021:0799-1openSUSE-SU-2019:1725-1openSUSE-SU-2019:1708-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-9578 updated cvss 6.5

libu2f-host: leak of uninitialized stack in devs.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.30% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-908 Use of Uninitialized Resource

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.