CVE-2026-33986

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 82% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: 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 3.24.2, in yuv_ensure_buffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpr_aligned_recalloc() call fails, the function returns FALSE but width/height are already inflated. This issue has been patched in version 3.24.2.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
18%
KEV
Not listed

Published

March 30, 2026

Last Modified

July 15, 2026

Advisory Details (5)

Auto-updated Jul 3, 2026
Patch available. Sources: github_commit, github, redhat.
redhat

Affected: Red Hat Enterprise Linux 10",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33986.json
redhat Patch Available

2453221 – (CVE-2026-33986) CVE-2026-33986 FreeRDP: FreeRDP: Arbitrary code execution or denial of service via H.264 codec memory allocation vulnerability

https://bugzilla.redhat.com/show_bug.cgi?id=2453221
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-33986
github Patch Available

H.264 YUV Buffer Dimension Desync - Heap OOB Write · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-h6qw-wxvm-hf97
github_commit

commit f6e43e208958 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit f6e43e208958 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/f6e43e208958140074ae9bb93cd0c9045a371c77

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 ... 3.24.2+dfsg-1~bpo13+1 (25 versions)3.24.2+dfsg-1—

Weakness Classification(2)

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

Frequently asked(5)

What is CVE-2026-33986?
CVE-2026-33986 is a high vulnerability published on March 30, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.24.2, in yuvensurebuffer() in libfreerdp/codec/h264.c, h264->width and h264->height are updated before the reallocation loop. If any winpralignedrecalloc() call fails, the function returns FALSE but width/height are…
When was CVE-2026-33986 disclosed?
CVE-2026-33986 was first published in the National Vulnerability Database on March 30, 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-2026-33986 actively exploited?
CVE-2026-33986 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 82.1% of all scored CVEs.
What is the CVSS score of CVE-2026-33986?
CVE-2026-33986 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33986?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33986, 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-2026-33986

Explore →

Is Your Infrastructure Affected by CVE-2026-33986?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs