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: 0.4%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.32.1+dfsg-1~bpo13+1 (49 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.28.0+dfsg-2 (37 versions)
  • every version up to 3.29.0+dfsg-1: fixed in 3.29.0+dfsg-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 62× 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 155 total refreshes for this CVE.

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

Related CVEs(same product + 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 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 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67306?
CVE-2026-67306 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67306?
A fix for CVE-2026-67306 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67306 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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