Out-of-bounds read in tpm2-tss - CVE-2026-73980
Published: November 4, 2026
Vulnerability identifier: #VU159286
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73980
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to potentially cause a denial of service in applications using tpm2-tss.
The vulnerability exists due to an out-of-bounds read in the check_out_string function in src/tss2-fapi/ifapi_eventlog_system.c when processing firmware event-log JSON. A remote attacker can supply an event_data value that is a prefix of an expected token but shorter than that token to cause strncmp to read beyond the allocated heap buffer, potentially crashing the application.
Affected software
tpm2-tss
How to mitigate CVE-2026-73980
Install security update from vendor's website.
tpm2-tss - addressed in versions 4.1.4, 4.2.0