CVE-2026-21444
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.
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
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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS: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 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
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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
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| affected | ||
| first indexed | CVE 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
github.com/stefanberger/libtpms/security/advisories/GHSA-7jxr-4j3g-p34f
github.com/stefanberger/libtpms/issues/541
github.com/stefanberger/libtpms/commit/33c9ff074cb16c1841ce7d7f33643c17c426743a
github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21444.json
nvd.nist.gov/vuln/detail/CVE-2026-21444
security-tracker.debian.org/tracker/CVE-2026-21444
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suse.com/support/update/announcement/2026/suse-su-202621571-1
bugzilla.suse.com/1244528
bugzilla.suse.com/1260439
suse.com/security/cve/CVE-2025-49133
suse.com/security/cve/CVE-2026-21444
suse.com/support/update/announcement/2026/suse-su-202621581-1
ubuntu.com/security/CVE-2026-21444
cve.org/CVERecord?id=CVE-2026-21444