Vulnerability in Libtpms Project
CVE-2026-21444
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.001 (0.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Libtpms Project
- Stefanberger Libtpms — versions >= 0.10.0, < 0.10.2
Weakness classification (CWE)
References
- github.com/stefanberger/libtpms/security/advisories/GHSA-7jxr-4j3g-p34f (Patch, Vendor Advisory)
- github.com/stefanberger/libtpms/issues/541 (Exploit, Issue Tracking)
- github.com/stefanberger/libtpms/commit/33c9ff074cb16c1841ce7d7f33643c17c426743a (Patch)
Frequently asked questions
- What is CVE-2026-21444?
- CVE-2026-21444 is a medium-severity vulnerability in Libtpms Project, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 5.5/10. Published 2026-01-02.
- How severe is CVE-2026-21444?
- Medium severity. CVSS v3 base score is 5.5 out of 10.