Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-67291

CVE-2026-67291HIGH

FreeRDP before 3.29.0 Heap Out-of-Bounds Read via GLYPH_FRAGMENT_ADD

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   N   N   H    8.7   .0041   32.9     —

AFFECTED
  Product  Versions     Fixed
  FreeRDP  unspecified  3.29.0

TIMELINE
  Jul 29  Reserved by VulnCheck
  Aug 1   Published (CNA: VulnCheck)
  Sep 3   EXPLOIT PUBLISHED — CVE-2026-67291 (FreeRDP). Public exploit reference added.

CWE-125 · CNA: VulnCheck · CVSS v4.0 · 3 references · NVD status: Analyzed

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
July 29, 2026	Reserved	Reserved by VulnCheck
August 1, 2026	Published	Published (CNA: VulnCheck)
September 3, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67291 (FreeRDP). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
FreeRDP	FreeRDP	—	—	3.29.0

Weaknesses

CWE-125

References (3)

https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af319f [Patch]
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6 [Exploit, Vendor Advisory]
https://www.vulncheck.com/advisories/freerdp-before-heap-out-of-bounds-read-via-glyph-fragment-add [Patch, Third Party Advisory]

Authoritative record: CVE-2026-67291 at cve.org

Vendors: freerdp

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67291 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.