CVE-2026-21444 libtpms returns wrong initialization vector when certain symmetric ciphers are used
libtpms returns the initial IV instead of the last IV for certain symmetric ciphers, weakening encryption and compromising data confidentiality.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-21444?
CVE-2026-21444 is a medium-severity vulnerability in stefanberger libtpms, published on 2 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0.10.0 and 0.10.1. The commonly used integration of libtpms with OpenSSL 3.x contained a vulnerability related to the returned IV (initialization vector) when certain symmetric ciphers were used. Instead of returning the last IV it returned the initial IV to the caller, thus weakening the subsequent encryption and decryption steps. The highest threat from this vulnerability is to data confidentiality. Version 0.10.2 fixes the issue. No known workarounds are available.
Which versions are affected by CVE-2026-21444?
It affects 1 product.
Linux distribution packages (1)
libtpms openSUSE:Tumbleweed | All versions | 0.10.2-1.1 |
Products include Libtpms Project Libtpms.
How do I fix CVE-2026-21444?
Upgrade to a fixed version.
Is CVE-2026-21444 being exploited?
There is no known exploitation of CVE-2026-21444 in the wild and no public exploit code.
Other vulnerabilities in stefanberger libtpms
Sources
Also known as DEBIAN-CVE-2026-21444, GHSA-7jxr-4j3g-p34f, openSUSE-SU-2026:10422-1.