CVE-2026-21444CWE-327CWE-330

libtpms returns wrong initialization vector when certain symmetric ciphers are used

Medium · published January 2, 2026

CVSS v3.1
5.5
EPSS
0%
Percentile
0.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00080 · 0.1th percentile
Weaknesses
CWE-327 · Use of a Broken or Risky Cryptographic Algorithm; CWE-330 · Use of Insufficiently Random Values
Published
2026-01-02T19:05Z
EPSS history
Timeline
  • 02 JAN 19:05Z
    libtpms returns wrong initialization vector when certain symmetric ciphers are used
    cvelistv5