CVE-2025-49133: Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu

Routine

MEDIUM 5.9DOWNGRADE

CVE-2025-49133 is a medium-severity flaw (CVSS 5.9) affecting libtpms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a potential out of bounds (OOB) read vulnerability. The vulnerability occurs in the ‘CryptHmacSign’ function with an inconsistent pairing of the signKey and signScheme parameters, where the signKey is ALG_KEYEDHAS

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-125
Published	2025-06-10
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: libtpms project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-06-10 20:15 UTCPublished CVE record published
2026-06-17 09:30 UTCUpdated Record last modified

libtpms project libtpms DOWNGRADE

Affected: 0.7.11 · 0.8.9 · 0.9.6 · 0.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7.11

1. Check installed version

apt-cache policy libtpms || rpm -q libtpms || libtpms --version

2. No fixed release: DOWNGRADE to a release before 0.7.11 (Debian / Ubuntu)

apt-cache madison libtpms sudo apt install libtpms=<VERSION_BEFORE_0.7.11> sudo apt-mark hold libtpms

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list libtpms sudo dnf downgrade libtpms-<VERSION_BEFORE_0.7.11> sudo dnf versionlock add libtpms

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-49133?

libtpms: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-49133 being exploited?

CVE-2025-49133 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-49133 affect?

CVE-2025-49133 affects libtpms. Severity is medium (CVSS 5.9). Libtpms is a library that targets the integration of TPM functionality into hypervisors, primarily into Qemu. Libtpms, which is derived from the TPM 2.0 reference implementation code published by the Trusted Computing Group, is prone to a p

How urgent is CVE-2025-49133?

Priority 22/100. No elevated risk signals yet.

Software pages

QEMU vulnerabilities

Related CVEs

CVE-2026-21444 MEDIUM 5.5 UPGRADE libtpms, a library that provides software emulation of a Trusted Platform Module, has a flaw in versions 0.10.

References

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