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CVE-2026-91945

6.5 · MEDIUM

FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays.

Published Sep 15, 2026freerdpCWE-125EPSS 0.58%

Overview

CVE-2026-91945 is a medium-severity vulnerability affecting freerdp freerdp. It was published on September 15, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKID_CORE_DEVICE_IOCOMPLETION responses to trigger reads past stack or heap objects, causing process termination.

Remediation

Check the references section for vendor advisories and patches from freerdp. Update freerdp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
freerdpfreerdp>= 3.28.0, < 3.31.0Affected

References

GitHubgithub.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369fGitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3rRefwww.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atrGitHubgithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r

How CyberStrike helps

Frequently asked questions

What is CVE-2026-91945?

CVE-2026-91945 is a medium-severity vulnerability affecting freerdp freerdp. It was published on September 15, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-91945?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-91945?

Check the references section for vendor advisories and patches from freerdp. Update freerdp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-91945?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-91945 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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