--- id: CVE-2026-67291 title: >- FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c summary: >- FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c. When handling a GLYPH_FRAGMENT_ADD update, the code reads … severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H' cwe: - CWE-125 published: '2026-08-01' updated: '2026-08-01' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67291' references: - url: >- https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f label: disclosure@vulncheck.com - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6' label: disclosure@vulncheck.com - url: >- https://www.vulncheck.com/advisories/freerdp-before-heap-out-of-bounds-read-via-glyph-fragment-add label: disclosure@vulncheck.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67291.json - url: 'https://access.redhat.com/security/cve/CVE-2026-67291' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2510010' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-67291' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67291' - url: 'https://access.redhat.com/errata/RHSA-2026:61378' - url: 'https://access.redhat.com/errata/RHSA-2026:62571' - url: 'https://access.redhat.com/errata/RHSA-2026:65855' - url: 'https://access.redhat.com/errata/RHSA-2026:61379' - url: 'https://access.redhat.com/errata/RHSA-2026:66281' - url: 'https://access.redhat.com/errata/RHSA-2026:66282' - url: 'https://access.redhat.com/errata/RHSA-2026:68707' - url: 'https://access.redhat.com/errata/RHSA-2026:68706' tags: - nvd - csaf - vex - red-hat ingestedAt: '2026-08-02T05:17:49.467Z' epss: 0.00354 epssPercentile: 0.28995 vendor: Red Hat product: Red Hat Enterprise Linux AppStream (v. 8) affected: - enterprise_linux 6 - enterprise_linux 7 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 patched: - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 scores: nvd: 7.5 vendor: 6.5 --- ## Overview FreeRDP before 3.29.0 (affected versions <= 3.28.0) contains a heap out-of-bounds read in update_process_glyph_fragments()/glyph_cache_fragment_put() in libfreerdp/cache/glyph.c. When handling a GLYPH_FRAGMENT_ADD update, the code reads a one-byte server-controlled declared fragment size but does not verify it fits within the remaining received buffer before allocating and copying that many bytes. A malicious RDP server can send a short fragment with an oversized declared size, causing the client to read beyond the allocated buffer, resulting in an out-of-bounds read and client crash. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:61378** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61378) - **RHSA-2026:62571** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-02 · [advisory](https://access.redhat.com/errata/RHSA-2026:62571) - **RHSA-2026:65855** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:65855) - **RHSA-2026:61379** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61379) - **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-67291.json) - **RHSA-2026:66281** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66281) - **RHSA-2026:66282** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66282) - **RHSA-2026:68707** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68707) - **RHSA-2026:68706** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68706)