CVE-2026-67306

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-01. a secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0

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

FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planar_decompress_plane_rle and planar_decompress_plane_rle_only in libfreerdp/codec/planar.c. Only the 1-byte control byte is bounds-checked; the subsequent 0–15 attacker-declared raw bytes are read without validating that the source buffer contains them. A malicious or compromised RDP server can send a truncated planar-encoded bitmap or surface update (reachable via both the Bitmap Update PDU and RDPGFX Surface Command paths) that causes the client to read past the end of the source buffer. The issue is fixed in FreeRDP 3.29.0.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 1, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Aug 1, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic

FreeRDP before 3.29.0 Out-of-Bounds Read via Planar RLE | Advisories | VulnCheck

https://www.vulncheck.com/advisories/freerdp-before-out-of-bounds-read-via-planar-rle
github_commit

commit 5370fb26fbf0 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 5370fb26fbf0 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/5370fb26fbf034ecd11d3026b6ad639b5fff493f
github Patch Available🟡 PoC Available

Out-of-Bounds Read in Planar RLE Decoder (planar_decompress_plane_rle / planar_decompress_plane_rle_only) · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qrxx-7g3c-j6w3

Vendor Advisories for CVE-2026-67306(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.31.0+dfsg-1 (44 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.28.0+dfsg-2 (37 versions)3.29.0+dfsg-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 70× 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.

Showing the most recent 100 of 127 total refreshes for this CVE.

  1. 2026-09-19 03:57 UTCEG score recompute
  2. 2026-09-19 03:57 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 01:15 UTCEG score recompute
  5. 2026-09-18 01:15 UTCGHSA enrichment
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 11:19 UTCEG score recompute
  8. 2026-09-16 11:19 UTCGHSA enrichment
  9. 2026-09-16 05:15 UTCEPSS rescore
  10. 2026-09-15 07:05 UTCEG score recompute
  11. 2026-09-15 07:05 UTCGHSA enrichment
  12. 2026-09-14 03:50 UTCEG score recompute
  13. 2026-09-14 03:50 UTCGHSA enrichment
  14. 2026-09-13 02:10 UTCEG score recompute
  15. 2026-09-13 02:10 UTCGHSA enrichment
  16. 2026-09-12 00:30 UTCEG score recompute
  17. 2026-09-12 00:30 UTCGHSA enrichment
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 09:37 UTCEPSS rescore
  20. 2026-09-10 21:30 UTCEG score recompute
  21. 2026-09-10 21:30 UTCGHSA enrichment
  22. 2026-09-09 19:44 UTCEG score recompute
  23. 2026-09-09 19:44 UTCGHSA enrichment
  24. 2026-09-08 22:01 UTCEPSS rescore
  25. 2026-09-08 16:13 UTCGHSA enrichment
Show 75 more
  1. 2026-09-07 22:25 UTCEG score recompute
  2. 2026-09-07 22:25 UTCGHSA enrichment
  3. 2026-09-07 16:01 UTCEPSS rescore
  4. 2026-09-06 20:45 UTCEG score recompute
  5. 2026-09-06 20:45 UTCGHSA enrichment
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-05 18:43 UTCEG score recompute
  8. 2026-09-05 18:43 UTCGHSA enrichment
  9. 2026-09-05 15:31 UTCEPSS rescore
  10. 2026-09-04 11:20 UTCEG score recompute
  11. 2026-09-04 11:20 UTCGHSA enrichment
  12. 2026-09-04 05:07 UTCEPSS rescore
  13. 2026-09-03 09:03 UTCEG score recompute
  14. 2026-09-03 09:03 UTCGHSA enrichment
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 22:27 UTCEG score recompute
  17. 2026-09-01 22:27 UTCGHSA enrichment
  18. 2026-09-01 13:54 UTCEPSS rescore
  19. 2026-09-01 04:40 UTCEPSS rescore
  20. 2026-08-31 20:47 UTCEG score recompute
  21. 2026-08-31 20:47 UTCGHSA enrichment
  22. 2026-08-30 23:52 UTCEG score recompute
  23. 2026-08-30 23:52 UTCGHSA enrichment
  24. 2026-08-30 19:17 UTCEPSS rescore
  25. 2026-08-30 01:22 UTCEPSS rescore
  26. 2026-08-29 22:12 UTCEG score recompute
  27. 2026-08-29 22:12 UTCGHSA enrichment
  28. 2026-08-28 21:42 UTCEPSS rescore
  29. 2026-08-27 08:49 UTCEG score recompute
  30. 2026-08-27 08:49 UTCGHSA enrichment
  31. 2026-08-26 14:47 UTCEPSS rescore
  32. 2026-08-26 06:44 UTCEG score recompute
  33. 2026-08-26 06:44 UTCGHSA enrichment
  34. 2026-08-25 13:49 UTCEPSS rescore
  35. 2026-08-25 04:46 UTCEG score recompute
  36. 2026-08-25 04:46 UTCGHSA enrichment
  37. 2026-08-24 03:06 UTCGHSA enrichment
  38. 2026-08-23 01:02 UTCEG score recompute
  39. 2026-08-23 01:02 UTCGHSA enrichment
  40. 2026-08-23 00:19 UTCEPSS rescore
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 23:22 UTCEG score recompute
  43. 2026-08-21 23:22 UTCGHSA enrichment
  44. 2026-08-20 22:56 UTCEPSS rescore
  45. 2026-08-20 21:42 UTCGHSA enrichment
  46. 2026-08-19 20:02 UTCEG score recompute
  47. 2026-08-19 20:02 UTCGHSA enrichment
  48. 2026-08-19 17:04 UTCEPSS rescore
  49. 2026-08-18 18:22 UTCEG score recompute
  50. 2026-08-18 18:22 UTCGHSA enrichment
  51. 2026-08-18 13:48 UTCEPSS rescore
  52. 2026-08-17 15:55 UTCEG score recompute
  53. 2026-08-17 15:55 UTCGHSA enrichment
  54. 2026-08-17 13:47 UTCEPSS rescore
  55. 2026-08-16 14:56 UTCEPSS rescore
  56. 2026-08-16 14:15 UTCEG score recompute
  57. 2026-08-16 14:15 UTCGHSA enrichment
  58. 2026-08-15 12:35 UTCEG score recompute
  59. 2026-08-15 12:35 UTCGHSA enrichment
  60. 2026-08-15 01:30 UTCEPSS rescore
  61. 2026-08-14 10:55 UTCEG score recompute
  62. 2026-08-14 10:55 UTCGHSA enrichment
  63. 2026-08-13 22:00 UTCEPSS rescore
  64. 2026-08-13 09:15 UTCEG score recompute
  65. 2026-08-13 09:15 UTCGHSA enrichment
  66. 2026-08-12 13:51 UTCEPSS rescore
  67. 2026-08-12 07:35 UTCEG score recompute
  68. 2026-08-12 07:35 UTCGHSA enrichment
  69. 2026-08-11 05:55 UTCEG score recompute
  70. 2026-08-11 05:55 UTCGHSA enrichment
  71. 2026-08-11 00:00 UTCEPSS rescore
  72. 2026-08-10 04:15 UTCEG score recompute
  73. 2026-08-10 04:15 UTCGHSA enrichment
  74. 2026-08-09 13:47 UTCEPSS rescore
  75. 2026-08-09 02:35 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67306?
CVE-2026-67306 is a medium vulnerability published on August 1, 2026. FreeRDP versions 3.28.0 and earlier contain an out-of-bounds read vulnerability in the RDP6 planar RLE bitmap decoder functions planardecompressplanerle and planardecompressplanerle_only in libfreerdp/codec/planar.c. Only the 1-byte control byte is bounds-checked; the subsequent 0–15…
When was CVE-2026-67306 disclosed?
CVE-2026-67306 was first published in the National Vulnerability Database on August 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67306 actively exploited?
CVE-2026-67306 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.0% of all scored CVEs.
What is the CVSS score of CVE-2026-67306?
CVE-2026-67306 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-67306?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67306, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-67306

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