Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/FreeRDP/FreeRDP/commit/f3b4347105114fe7453828736bea069999af31
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6
- https://www.vulncheck.com/advisories/freerdp-before-heap-out-of-bounds-read-via-
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hgj8-g595-wfc6
FAQ
What is CVE-2026-67291?
CVE-2026-67291 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-67291?
CVE-2026-67291 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67291?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.