CVE-2026-23534

Summary

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, a client-side heap buffer overflow occurs in the ClearCodec bands decode path when crafted band coordinates allow writes past the end of the destination surface buffer. A malicious server can trigger a client‑side heap buffer overflow, causing a crash (DoS) and potential heap corruption with code‑execution risk depending on allocator behavior and surrounding heap layout. Version 3.21.0 contains a patch for the issue.

Affected Software

Weaknesses

• CWE-122: CWE-122: Heap-based Buffer Overflow

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

freerdp: FreeRDP: Arbitrary code execution and denial of service via client-side heap buffer overflow

Additional References

• https://access.redhat.com/security/cve/CVE-2026-23534
• https://bugzilla.redhat.com/show_bug.cgi?id=2430888
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23534.json
• https://access.redhat.com/errata/RHSA-2026:2952
• https://access.redhat.com/errata/RHSA-2026:2222
• https://access.redhat.com/errata/RHSA-2026:2081
• https://access.redhat.com/errata/RHSA-2026:2736
• https://access.redhat.com/errata/RHSA-2026:3037
• https://access.redhat.com/errata/RHSA-2026:2048

References

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3frr-mp8w-4599
• https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L878-L879
• https://github.com/FreeRDP/FreeRDP/blob/38514dfa5813aa945a86cfbcec279033f8394468/libfreerdp/codec/clear.c#L883-L884
• https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0

• ←Previous
• Next→