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CVE-2026-21444

libtpms returns wrong initialization vector when certain symmetric ciphers are used

5.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.08%Up 0.1 points since Jan 3, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.5

libtpms returns wrong initialization vector when certain symmetric ciphers are used

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.

Record
CVE-2026-21444
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-327, CWE-330
Updated
2026-11-02
EUVDEUVD-2026-0753 5.5

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.

Record
EUVD-2026-0753
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
NVD 5.5

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.

Record
CVE-2026-21444
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-327, CWE-330
Updated
2026-11-02
OSV 5.5

libtpms returns wrong initialization vector when certain symmetric ciphers are used

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.

Record
CVE-2026-21444
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-327, CWE-330
Updated
2026-11-02
OSVDEBIAN-CVE-2026-21444 5.5

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.

Record
DEBIAN-CVE-2026-21444
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVUBUNTU-CVE-2026-21444 5.5

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.

Record
UBUNTU-CVE-2026-21444
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVopenSUSE-SU-2026:10422-1 No score

libtpms-devel-0.10.2-1.1 on GA media

These are all security issues fixed in the libtpms-devel-0.10.2-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10422-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20695-1 No score

Security update for libtpms

This update for libtpms fixes the following issues:

  • CVE-2025-49133: Fixed potential out of bounds (OOB) read vulnerability (bsc#1244528).
  • CVE-2026-21444: Fixed remote data confidentiality compromise via incorrect Initialization Vector (IV) handling (bsc#1260439).
Record
openSUSE-SU-2026:20695-1
Updated
2026-11-02
OSVSUSE-SU-2026:21571-1 No score

Security update for libtpms

This update for libtpms fixes the following issues:

  • CVE-2025-49133: Fixed potential out of bounds (OOB) read vulnerability (bsc#1244528).
  • CVE-2026-21444: Fixed remote data confidentiality compromise via incorrect Initialization Vector (IV) handling (bsc#1260439).
Record
SUSE-SU-2026:21571-1
Updated
2026-11-02
OSVSUSE-SU-2026:21581-1 No score

Security update for libtpms

This update for libtpms fixes the following issues:

  • CVE-2025-49133: Fixed potential out of bounds (OOB) read vulnerability (bsc#1244528).
  • CVE-2026-21444: Fixed remote data confidentiality compromise via incorrect Initialization Vector (IV) handling (bsc#1260439).
Record
SUSE-SU-2026:21581-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
libtpms
Debian:14
before 0.10.2-1, plus listed versions
0.10.1-10.10.1-20.9.2-3.20.9.2-3.2+hurd.1
0.10.2-1
libtpms
openSUSE:Tumbleweed
before 0.10.2-1.1
0.10.2-1.1

History

History
RecordedChangedSources
facts
affected
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-21444 is a medium vulnerability (CVSS 5.5) in Libtpms Project Libtpms, published January 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.08%, the 0th percentile. Fixed in libtpms 0.10.2-1.

References

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