CVE-2026-25955

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% 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: 0%CVSS: 9.8Exploit: None knownExposed: 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 version 3.23.0, xf_AppUpdateWindowFromSurface reuses a cached XImage whose data pointer references a freed RDPGFX surface buffer, because gdi_DeleteSurface frees surface->data without invalidating the appWindow->image that aliases it. Version 3.23.0 fixes the issue.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
42%
KEV
Not listed

Published

February 25, 2026

Last Modified

June 17, 2026

Advisory Details (6)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Heap-use-after-free in xf_AppUpdateWindowFromSurface (stale XImage) · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4g54-x8v7-559x
github_commit

commit 169d35873450 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 169d35873450 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/169d358734509e82663a0d6a0085ae726d439d8e
generic

FreeRDP/libfreerdp/gdi/gfx.c at 5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/libfreerdp/gdi/gfx.c#L1224-L1227
generic

FreeRDP/client/X11/xf_window.c at 5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_window.c#L1528
generic

FreeRDP/client/X11/xf_window.c at 5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_window.c#L1494-L1500
generic

FreeRDP/client/X11/xf_window.c at 5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/blob/5c7aae27d0417b42b4806c2a5c583ca39dd9ef1e/client/X11/xf_window.c#L1484-L1492

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-2.13.15.0+dfsg-2.1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
freerdp33.15.0+dfsg-2.1 ... 3.23.0+dfsg-1~bpo13+1 (20 versions)3.23.0+dfsg-1—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× 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.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-25955?
CVE-2026-25955 is a critical vulnerability published on February 25, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, xfAppUpdateWindowFromSurface reuses a cached XImage whose data pointer references a freed RDPGFX surface buffer, because gdiDeleteSurface frees surface->data without invalidating the appWindow->image that…
When was CVE-2026-25955 disclosed?
CVE-2026-25955 was first published in the National Vulnerability Database on February 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-25955 actively exploited?
CVE-2026-25955 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 58.3% of all scored CVEs.
What is the CVSS score of CVE-2026-25955?
CVE-2026-25955 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-25955?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-25955, 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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