CVE-2026-31806

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 52% of all CVEs by exploit prediction. 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: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

March 13, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Aug 22, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github, redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:6727
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:6340
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:19033
redhat Patch Available

Affected: Red Hat Enterprise Linux 7 Extended Lifecycle Support.

https://access.redhat.com/errata/RHSA-2026:11323
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support.

https://access.redhat.com/errata/RHSA-2026:10951
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:10735
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.2 Advanced Update Support.

https://access.redhat.com/errata/RHSA-2026:10734
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:10076
github Patch Available🟡 PoC Available

Heap Buffer Overflow in nsc_process_message() via Unchecked SURFACE_BITS_COMMAND Bitmap Dimensions · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2
github_commit

commit 83d9aedea278 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 83d9aedea278 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b

Vendor Advisories for CVE-2026-31806(14)

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

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatfreerdp-2:3.10.3-12.el10_2.22026-05-19redhat
redhatfreerdp-0:2.1.1-5.el7_9.72026-04-28redhat
redhatfreerdp-2:2.0.0-46.rc4.el8_2.102026-04-27redhat
redhatfreerdp-2:2.2.0-7.el8_6.52026-04-27redhat
redhatfreerdp-2:2.2.0-12.el8_42026-04-27redhat
redhatfreerdp-2:2.2.0-12.el8_8.52026-04-23redhat
redhatfreerdp-2:2.4.1-3.el9_0.42026-04-22redhat
redhatfreerdp-2:2.4.1-6.el9_2.62026-04-22redhat
redhatfreerdp-2:2.11.2-1.el9_4.52026-04-08redhat
redhatfreerdp-2:2.11.7-6.el8_102026-04-07redhat
redhatfreerdp-2:3.10.3-5.el10_1.52026-04-07redhat
redhatfreerdp-2:2.11.7-1.el9_6.72026-04-07redhat
redhatfreerdp-2:3.10.3-3.el10_0.52026-04-07redhat
redhatfreerdp-2:2.11.7-1.el9_7.52026-04-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

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, 3.15.0+dfsg-2.1+deb13u13.15.0+dfsg-2.1+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.23.0+dfsg-1~bpo13+1 (21 versions)3.24.0+dfsg-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 73× 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 120 total refreshes for this CVE.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 14:17 UTCEPSS rescore
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-19 17:03 UTCEPSS rescore
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 11:38 UTCEG score recompute
  12. 2026-08-16 11:38 UTCVendor advisory
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 01:30 UTCEPSS rescore
  15. 2026-08-14 23:45 UTCVendor advisory
  16. 2026-08-14 20:04 UTCVendor advisory
  17. 2026-08-14 15:03 UTCVendor advisory
  18. 2026-08-14 11:23 UTCVendor advisory
  19. 2026-08-14 07:40 UTCEG score recompute
  20. 2026-08-14 07:40 UTCVendor advisory
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 02:19 UTCVendor advisory
  23. 2026-08-12 22:39 UTCEG score recompute
  24. 2026-08-12 22:39 UTCVendor advisory
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 75 more
  1. 2026-08-12 01:21 UTCVendor advisory
  2. 2026-08-11 21:41 UTCEG score recompute
  3. 2026-08-11 21:41 UTCVendor advisory
  4. 2026-08-11 08:39 UTCVendor advisory
  5. 2026-08-11 04:49 UTCEG score recompute
  6. 2026-08-11 04:49 UTCVendor advisory
  7. 2026-08-11 00:00 UTCEPSS rescore
  8. 2026-08-10 12:17 UTCVendor advisory
  9. 2026-08-10 07:50 UTCVendor advisory
  10. 2026-08-10 04:10 UTCVendor advisory
  11. 2026-08-10 00:28 UTCVendor advisory
  12. 2026-08-09 20:47 UTCVendor advisory
  13. 2026-08-09 17:07 UTCEG score recompute
  14. 2026-08-09 17:07 UTCVendor advisory
  15. 2026-08-09 13:46 UTCEPSS rescore
  16. 2026-08-09 13:26 UTCVendor advisory
  17. 2026-08-09 07:18 UTCEG score recompute
  18. 2026-08-09 07:18 UTCVendor advisory
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-08 08:42 UTCVendor advisory
  21. 2026-08-08 05:02 UTCVendor advisory
  22. 2026-08-08 01:21 UTCVendor advisory
  23. 2026-08-07 21:41 UTCVendor advisory
  24. 2026-08-07 18:00 UTCEG score recompute
  25. 2026-08-07 18:00 UTCVendor advisory
  26. 2026-08-06 19:47 UTCEG score recompute
  27. 2026-08-06 19:47 UTCVendor advisory
  28. 2026-08-06 13:46 UTCEPSS rescore
  29. 2026-08-06 09:22 UTCVendor advisory
  30. 2026-08-06 05:34 UTCVendor advisory
  31. 2026-08-06 01:54 UTCEG score recompute
  32. 2026-08-06 01:54 UTCVendor advisory
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-04 15:10 UTCEPSS rescore
  35. 2026-08-04 10:38 UTCEPSS rescore
  36. 2026-08-04 04:51 UTCVendor advisory
  37. 2026-08-04 01:10 UTCEG score recompute
  38. 2026-08-04 01:10 UTCVendor advisory
  39. 2026-08-03 10:36 UTCEPSS rescore
  40. 2026-08-03 01:16 UTCVendor advisory
  41. 2026-08-02 20:57 UTCVendor advisory
  42. 2026-08-02 17:17 UTCEG score recompute
  43. 2026-08-02 17:17 UTCVendor advisory
  44. 2026-08-02 02:27 UTCEPSS rescore
  45. 2026-08-01 04:16 UTCEPSS rescore
  46. 2026-07-30 16:28 UTCEPSS rescore
  47. 2026-07-30 01:30 UTCEPSS rescore
  48. 2026-07-28 15:36 UTCEPSS rescore
  49. 2026-07-26 14:54 UTCEPSS rescore
  50. 2026-07-26 14:54 UTCEPSS rescore
  51. 2026-07-25 14:18 UTCEPSS rescore
  52. 2026-07-25 14:17 UTCEPSS rescore
  53. 2026-07-24 14:17 UTCEPSS rescore
  54. 2026-07-23 14:18 UTCEPSS rescore
  55. 2026-07-23 14:18 UTCEPSS rescore
  56. 2026-07-23 03:08 UTCEG score recompute
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-22 14:08 UTCEPSS rescore
  59. 2026-07-21 15:24 UTCEPSS rescore
  60. 2026-07-21 15:24 UTCEPSS rescore
  61. 2026-07-20 17:08 UTCEPSS rescore
  62. 2026-07-20 17:08 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 14:31 UTCEPSS rescore
  65. 2026-07-19 02:29 UTCEPSS rescore
  66. 2026-07-18 10:04 UTCEPSS rescore
  67. 2026-07-18 10:04 UTCEPSS rescore
  68. 2026-07-18 06:59 UTCOSV refresh
  69. 2026-07-16 17:03 UTCEPSS rescore
  70. 2026-07-16 17:03 UTCEPSS rescore
  71. 2026-07-15 16:57 UTCEPSS rescore
  72. 2026-07-15 16:57 UTCEPSS rescore
  73. 2026-07-15 02:22 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  74. 2026-07-15 02:00 UTCEPSS rescore
  75. 2026-07-15 02:00 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-31806?
CVE-2026-31806 is a critical vulnerability published on March 13, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdisurfacebits() function processes SURFACEBITSCOMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly…
When was CVE-2026-31806 disclosed?
CVE-2026-31806 was first published in the National Vulnerability Database on March 13, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-31806 actively exploited?
CVE-2026-31806 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.3% of all scored CVEs.
What is the CVSS score of CVE-2026-31806?
CVE-2026-31806 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31806?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31806, 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-2026-31806

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