Heap-byte disclosure or crash via zero-length bitmap
Published Mar 13, 2026 · Updated Mar 13, 2026
Out-of-bounds read in FreeRDP before 3.24.0 allows remote attackers to disclose one heap byte or crash a connecting RDP client. The RDPGFX Surface Command path passes a zero command length to freerdp_bitmap_decompress_planar, which reads the format header before checking SrcSize. Exploitation requires a client to connect to an attacker-controlled RDP server; the read exposes one adjacent heap byte or crashes on an unmapped page.
Summary
What happened
Out-of-bounds read in FreeRDP before 3.24.0 allows remote attackers to disclose one heap byte or crash a connecting RDP client. The RDPGFX Surface Command path passes a zero command length to freerdp_bitmap_decompress_planar, which reads the format header before checking SrcSize. Exploitation requires a client to connect to an attacker-controlled RDP server; the read exposes one adjacent heap byte or crashes on an unmapped page.
The record
- CVE
- CVE-2026-31897
- Published
- Mar 13, 2026
- Updated
- Mar 13, 2026
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-125, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 13, 2026CVE publishedPublication date reported by the CVE source.
- Mar 13, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.24.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GitHub advisory planar-decompression proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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