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CRITICAL

CVE-2026-25997

CVSS v3

9.8

CRITICAL

EPSS Score

0.9 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • freerdpAlmaLinux:10all versions · fixed in 2:3.10.3-5.el10_1.8and 5 other packages

Vendor advisories

  • CVE-2026-25997 Red Hat Product Security195 products fixed · 11 known affected

    freerdp: FreeRDP: Denial of service via heap use-after-free during auto-reconnect

    freerdp as a component of Red Hat Enterprise Linux 6 · freerdp-devel as a component of Red Hat Enterprise Linux 6 · freerdp-libs as a component of Red Hat Enterprise Linux 6

  • RHSA-2026:20605 Red Hat Product Security65 products fixed

    Red Hat Security Advisory: freerdp security update

  • RHSA-2026:19142 Red Hat Product Security65 products fixed

    Red Hat Security Advisory: freerdp security update

  • RHSA-2026:16014 Red Hat Product Security65 products fixed

    Red Hat Security Advisory: freerdp security update

Full record on NVD

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_clipboard_format_equal` reads freed `lastSentFormats` memory because `xf_clipboard_formats_free` (called from the cliprdr channel thread during auto-reconnect) frees the array while the X11 event thread concurrently iterates it in `xf_clipboard_changed`, triggering a heap use after free. Version 3.23.0 fixes the issue.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-02-25
Last Modified
2026-02-27

Frequently asked questions

What is CVE-2026-25997?

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_clipboard_format_equal` reads freed `lastSentFormats` memory because `xf_clipboard_formats_free` (called from the cliprdr channel thread during auto-reconnect) frees the array while the X11 event thread concurrently iterates it in `xf_clipboard_changed`, triggering a heap use after free. Version 3.23.0 fixes the issue.

Is CVE-2026-25997 actively exploited?

Active exploitation of CVE-2026-25997 has not been confirmed. Its EPSS score was 0.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-25997?

CVE-2026-25997 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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