CVE-2026-21444
published 2026-01-02CVE-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…
PriorityP426medium5.5CVSS 3.1
AVLACLPRLUINSUCHINAN
EPSS
0.07%
0.0th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | libtpms | < libtpms 0.10.2-1 (forky) | libtpms 0.10.2-1 (forky) |
| libtpms_project | libtpms | >= 0 < 0.10.2-1 | 0.10.2-1 |
| libtpms_project | libtpms | >= 0.10.0 < 0.10.2 | 0.10.2 |
| msrc | azl3_libtpms_0.9.6-8_on_azure_linux_3.0 | — | — |
| stefanberger | libtpms | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
osv5.5MEDIUM
vendor_debian5.5LOW
vendor_msrc5.5MEDIUM
vendor_redhat5.5MEDIUM
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OSV
CVE-2026-21444: libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0
osv·2026-01-02·CVSS 5.5
CVE-2026-21444 [MEDIUM] CVE-2026-21444: libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0
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.
Microsoft
libtpms returns wrong initialization vector when certain symmetric ciphers are used
vendor_msrc·2026-01-13·CVSS 5.5
CVE-2026-21444 [MEDIUM] CWE-327 libtpms returns wrong initialization vector when certain symmetric ciphers are used
libtpms returns wrong initialization vector when certain symmetric ciphers are used
Mariner: Mariner
GitHub_M: GitHub_M
Customer Action Required: Yes
Red Hat
limtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling
vendor_redhat·2026-01-02·CVSS 5.5
CVE-2026-21444 [MEDIUM] CWE-1204 limtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling
limtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling
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.
A flaw was found in libtpms, a library for Trusted Platform Module (TPM) emulation. An attacker with low privileg
Debian
CVE-2026-21444: libtpms - libtpms, a library that provides software emulation of a Trusted Platform Module...
vendor_debian·2026·CVSS 5.5
CVE-2026-21444 [MEDIUM] CVE-2026-21444: libtpms - libtpms, a library that provides software emulation of a Trusted Platform Module...
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.
Scope: local
bookworm: resolved
forky: resolved (fixed in 0.10.2-1)
sid: resolved (fixed in 0.10.2-1)
trixie: resolved
No detection rules found.
No public exploits indexed.
Bleepingcomputer
Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
blogs_bleepingcomputer·2026-01-13·CVSS 5.5
[MEDIUM] Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Lawrence Abrams
57 Elevation of Privilege vulnerabilities
3 Security Feature Bypass vulnerabilities
22 Remote Code Execution vulnerabilities
22 Information Disclosure vulnerabilities
2 Denial of Service vulnerabilities
5 Spoofing vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include Microsoft Edge (1 flaw) and Mariner vulnerabilities fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5074109 & KB5073455 cumulative updates and Windows 10 KB5073724 extended security update .
## 3 zero-days, one ex
Wiz
CVE-2026-21444 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2026-21444 [MEDIUM] CVE-2026-21444 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-21444 :
NixOS vulnerability analysis and mitigation
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 : NVD
## 5.5
Score
Published January 2, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
NixOS
Homebrew
Has Public Exploit Yes
H
Bugzilla
CVE-2026-21444 libtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling [fedora-42]
bugzilla·2026-01-02·CVSS 5.5
CVE-2026-21444 [MEDIUM] CVE-2026-21444 libtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling [fedora-42]
CVE-2026-21444 libtpms: libtpms: Remote data confidentiality compromise via incorrect Initialization Vector (IV) handling [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-
2026-01-02
Published