CVE-2026-55827

HIGHPre-NVD 7.57.5
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: secondary
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and DstHeight in gdi_Bitmap_Decompress, allowing a malicious RDP server to trigger a heap out-of-bounds write with attacker-controlled offset and content. This issue is fixed in version 3.27.1.

CVSS v3
7.5
EG Score
7.5(low)
EPSS
—
KEV
Not listed

Published

July 10, 2026

Last Modified

July 10, 2026

Advisory Details (4)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_pr, github_release.
github Patch Available🟡 PoC Available

Heap out-of-bounds write in FreeRDP RemoteFX (RFX) Cache Bitmap V3 decode - malicious RDP server achieves controlled `$pc` in a connecting client · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-c495-h83v-3prp
github_release Patch Available

3.27.1

Patch available: FreeRDP/FreeRDP 3.27.1

https://github.com/FreeRDP/FreeRDP/releases/tag/3.27.1
github_pr

Bitmap decode

Fix merged in FreeRDP/FreeRDP PR #12899 on 2026-06-16 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/pull/12899
github_commit

commit e58adf922ea4 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit e58adf922ea4 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/e58adf922ea4c0d5495e59a1fe488d70092e0e3e

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 4× in last 7d / 4× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 22:10 UTCEG score recompute
  2. 2026-07-11 09:07 UTCEG score recompute
  3. 2026-07-10 20:04 UTCEG score recompute
  4. 2026-07-10 20:02 UTCMITRE cvelistV5first tracked

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Frequently asked(4)

What is CVE-2026-55827?
CVE-2026-55827 is a high vulnerability published on July 10, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.27.1, FreeRDP clients launched with the non-default /cache:codec:rfx option pass desktop stride and height to RemoteFX decoding for Cache Bitmap V3 data while allocating bitmap->data only for the smaller DstWidth and…
When was CVE-2026-55827 disclosed?
CVE-2026-55827 was first published in the National Vulnerability Database on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-55827?
CVE-2026-55827 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-55827?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55827, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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