CVE-2026-21444— libtpms returns wrong initialization vector when certain symmetric ciphers are used
Quick assessment
Affected
stefanberger libtpms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
libtpms是Stefan Berger个人开发者的一个可信平台模块的软件仿真。 libtpms 0.10.0版本和0.10.1版本存在安全特征问题漏洞，该漏洞源于返回初始化向量不当，可能削弱后续加密和解密步骤，影响数据机密性。
Possible ATT&CK Techniques 1 AI
T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-21444
Vulnerability Information
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Vulnerability Title
libtpms returns wrong initialization vector when certain symmetric ciphers are used
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
libtpms 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libtpms是Stefan Berger个人开发者的一个可信平台模块的软件仿真。 libtpms 0.10.0版本和0.10.1版本存在安全特征问题漏洞，该漏洞源于返回初始化向量不当，可能削弱后续加密和解密步骤，影响数据机密性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| stefanberger | libtpms | >= 0.10.0, < 0.10.2 | - |
|
II. Public POCs for CVE-2026-21444
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-21444 (1)
Vendor Advisories for CVE-2026-21444 (1)
-
https://github.com/stefanberger/libtpms/security/advisories/GHSA-7jxr-4j3g-p34f x_refsource_CONFIRM
Other References for CVE-2026-21444 (1)
-
https://github.com/stefanberger/libtpms/issues/541 x_refsource_MISC
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V. Comments for CVE-2026-21444
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