CVE-2026-26955

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 57% 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, secondary
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.8Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., xfreerdp) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The gdi_SurfaceCommand_ClearCodec() handler does not call is_within_surface() to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled cmd->left/cmd->top (and subcodec rectangle offsets) to reach image copy routines that write into surface->data without bounds enforcement. The OOB write corrupts an adjacent gdiGfxSurface struct's codecs* pointer with attacker-controlled pixel data, and corruption of codecs* is sufficient to reach an indirect function pointer call (NSC_CONTEXT.decode at nsc.c:500) on a subsequent codec command — full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
56
EG Risk 56/100

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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.6%
EPSS %ILE
44th
KEV
Not listed

Published

February 25, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Jun 30, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github, redhat.
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:6395
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:6385
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:6384
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:6005
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:6004
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:5939
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:5936
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:19033
githubMentions a patch (unverified)🟡 PoC Available

Out-of-bounds Write in freerdp · Advisory · FreeRDP/FreeRDP · GitHub

Affected: 3.21.0. Those fixes hardened the

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj
github_commit

commit 7d8fdce2d0ef (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 7d8fdce2d0ef — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77

Vendor Advisories for CVE-2026-26955(8)

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

Patch Availability(15)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.16.0+dfsg-2ubuntu0.3) @ questing2026-06-30ubuntu
redhatfreerdp-2:3.10.3-12.el10_2.22026-05-19redhat
redhatfreerdp-0:2.1.1-5.el7_9.52026-04-09redhat
redhatfreerdp-2:2.2.0-12.el8_8.32026-04-07redhat
redhatfreerdp-2:2.2.0-7.el8_6.32026-04-06redhat
redhatfreerdp-2:2.2.0-10.el8_42026-04-06redhat
redhatfreerdp-2:2.0.0-46.rc4.el8_2.82026-04-06redhat
redhatfreerdp-2:2.11.2-1.el9_4.32026-04-01redhat
redhatfreerdp-2:2.4.1-3.el9_0.22026-04-01redhat
redhatfreerdp-2:2.4.1-6.el9_2.42026-04-01redhat
redhatfreerdp-2:2.11.7-1.el9_6.52026-04-01redhat
redhatfreerdp-2:2.11.7-1.el9_7.32026-03-30redhat
redhatfreerdp-2:2.11.7-4.el8_102026-03-30redhat
redhatfreerdp-2:3.10.3-5.el10_1.32026-03-26redhat
redhatfreerdp-2:3.10.3-3.el10_0.32026-03-26redhat

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 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
  • every version up to 3.15.0+dfsg-2.1+deb13u1: fixed in 3.15.0+dfsg-2.1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.23.0+dfsg-1~bpo13+1 (20 versions)
  • every version up to 3.23.0+dfsg-1: fixed in 3.23.0+dfsg-1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(7)

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 8× in last 7d / 25× 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 138 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-26955?
CVE-2026-26955 is a high vulnerability published on February 25, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., xfreerdp) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination…
When was CVE-2026-26955 disclosed?
CVE-2026-26955 was first published on February 25, 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-2026-26955 actively exploited?
CVE-2026-26955 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-26955?
CVE-2026-26955 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-26955?
A fix for CVE-2026-26955 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-26955 are linked in the Vendor Advisories panel on this page.

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