CVE-2026-91957: FreeRDP before 3.31.0 contains a use-after-free vulnerability in the smartcard RDPDR device handler when worke

Q: How do I fix CVE-2026-91957?

freerdp: upgrade to 3.31.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-91957 being exploited?

CVE-2026-91957 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-91957 affect?

CVE-2026-91957 affects freerdp. Severity is low (CVSS 3.1). FreeRDP before 3.31.0 contains a use-after-free vulnerability in the smartcard RDPDR device handler when worker thread creation fails after device registration. Attackers can trigger thread creation failure during channel setup to cause dev

Q: How urgent is CVE-2026-91957?

Priority 23/100. Public exploit reference

Routine

LOW 3.1UPGRADE

CVE-2026-91957 is a low-severity flaw (CVSS 3.1) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP before 3.31.0 contains a use-after-free vulnerability in the smartcard RDPDR device handler when worker thread creation fails after device registration. Attackers can trigger thread creation failure during channel setup to cause device pointer deallocation while devman retains a reference, leading to crash or code execution.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-09-15
Last modified	2026-09-24

Publisher (CNA): VulnCheck · Vendor: freerdp

Last updated 2026-09-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-15 16:17 UTCPublished CVE record published
2026-09-24 12:17 UTCUpdated Record last modified

freerdp freerdp UPGRADE

Affected: < 3.31.0

Fixed in: 3.31.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.31.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade freerdp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade freerdp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2026-91957?

freerdp: upgrade to 3.31.0. Exact commands for each OS are on this page.

Is CVE-2026-91957 being exploited?

CVE-2026-91957 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-2026-91957 affect?

CVE-2026-91957 affects freerdp. Severity is low (CVSS 3.1). FreeRDP before 3.31.0 contains a use-after-free vulnerability in the smartcard RDPDR device handler when worker thread creation fails after device registration. Attackers can trigger thread creation failure during channel setup to cause dev

How urgent is CVE-2026-91957?

Priority 23/100. Public exploit reference

Related CVEs

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CVE-2026-109941 MEDIUM 6.5 UPGRADE FreeRDP from 2.3.0 before 3.32.0 contains an infinite loop vulnerability in http_chuncked_read that allows mal
CVE-2026-109942 MEDIUM 6.5 UPGRADE FreeRDP 2.3.0 before 3.32.0 dereferences a NULL stream in rdg_process_close_packet in libfreerdp/core/gateway/

References

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