CVE-2026-109257: FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dang

This week

MEDIUM 5.9REMOTEDOWNGRADE

CVE-2026-109257 is a medium-severity flaw (CVSS 5.9) affecting freerdp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial buffer growth failure. Attackers using a crafted RDP client can negotiate NSCodec with a large desktop geometry to trigger allocation failure, crashing the server during context teardown.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-415
Published	2026-10-12
Last modified	2026-10-27

Publisher (CNA): VulnCheck · Vendor: freerdp

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-12 17:17 UTCPublished CVE record published
2026-10-27 18:56 UTCUpdated Record last modified

freerdp freerdp DOWNGRADE

Affected: 3.31.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.31.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.31.0 (Debian / Ubuntu)

apt-cache madison freerdp sudo apt install freerdp=<VERSION_BEFORE_3.31.0> sudo apt-mark hold freerdp

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

dnf --showduplicates list freerdp sudo dnf downgrade freerdp-<VERSION_BEFORE_3.31.0> sudo dnf versionlock add freerdp

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-2026-109257?

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

Is CVE-2026-109257 being exploited?

CVE-2026-109257 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-2026-109257 affect?

CVE-2026-109257 affects freerdp. Severity is medium (CVSS 5.9). FreeRDP before 3.32.0 contains a double-free vulnerability in nsc_context_initialize_encode() that leaves dangling plane pointers after a partial buffer growth failure. Attackers using a crafted RDP client can negotiate NSCodec with a large

How urgent is CVE-2026-109257?

Priority 39/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

WinRM and RDP vulnerabilities

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References

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