TI-2019-09116 Aliases CVE-2019-12210 GHSA-pxf2-5pmm-5r8f

In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set…

LOW 39Published 2019-06-04 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

In Yubico pam-u2f 1.0.7, when configured with debug and a custom debug log file is set using debug_file, that file descriptor is not closed when a new process is spawned. This leads to the file descriptor being inherited into the child process; the child process can then read from and write to it. This can leak sensitive information and also, if written to, be used to fill the disk or plant misinformation.

Why it matters now

EPSS 0.02056 81st percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:yubico:pam-u2f:1.0.7:::::::*	1.0.7	Vulnerable	Yubico

cpe:2.3:a:yubico:pam-u2f:1.0.7:*:*:*:*:*:*:* Versions 1.0.7 Vulnerable ·Yubico

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2019-12210
2026-10-03 Alias added: GHSA-pxf2-5pmm-5r8f

References

Exploit 1

[oss-security] 20190605 pam-u2f: CVE-2019-12210: debug_file file descriptor leak, CVE-2019-12209: symlink attack on u2f_keys leading to possible information leak

Patch 1

https://github.com/Yubico/pam-u2f/commit/18b1914e32b74ff52000f10e97067e841e5fff62

Advisory 3

TI-2019-09115 Yubico pam-u2f 1.0.7 attempts parsing of the configured authfile (default… CVSS 3.0HIGH 7.5
TI-2021-11912 Yubico pam-u2f before 1.1.1 has a logic issue that, depending on the pam-u2f… CVSS 3.1MEDIUM 6.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences