CVE-2026-29774

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.3% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-12055 (ENISA EUVD)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a client-side heap buffer overflow occurs in the FreeRDP client's AVC420/AVC444 YUV-to-RGB conversion path due to missing horizontal bounds validation of H.264 metablock regionRects coordinates. In yuv.c, the clamp() function (line 347) only validates top/bottom against the surface/YUV height, but never checks left/right against the surface width. When avc420_yuv_to_rgb (line 67) computes destination and source pointers using rect->left, it performs unchecked pointer arithmetic that can reach far beyond the allocated surface buffer. A malicious server sends a WIRE_TO_SURFACE_PDU_1 with AVC420 codec containing a regionRects entry where left greatly exceeds the surface width (e.g., left=60000 on a 128px surface). The H.264 bitstream decodes successfully, then yuv420_process_work_callback calls avc420_yuv_to_rgb which computes pDstPoint = pDstData + rect->top * nDstStep + rect->left * 4, writing 16-byte SSE vectors 1888+ bytes past the allocated heap region. This vulnerability is fixed in 3.24.0.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
68
EG Risk 68/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
27th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 13, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Aug 2, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Heap-buffer-overflow in avc420_yuv_to_rgb via OOB regionRects · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5q35-hv9x-7794
GitHub commit

commit 6482b7a92fff (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 6482b7a92fff — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/6482b7a92fff3959582cef052d1967ad6bde3738

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuwinpr3-utils (3.30.0+dfsg-0ubuntu0.26.04.1) @ resolute2026-10-27ubuntu

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, 3.15.0+dfsg-2.1+deb13u1
  • every version up to 3.15.0+dfsg-2.1+deb13u2: fixed in 3.15.0+dfsg-2.1+deb13u2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.23.0+dfsg-1~bpo13+1 (21 versions)
  • every version up to 3.24.0+dfsg-1: fixed in 3.24.0+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 9× in last 7d / 41× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 95 of 123 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 5 repeat rows among the latest 100 are merged into the row they repeat. The 28 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  2. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  4. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-10-27 22:02 UTCEG score recompute
  7. 2026-10-27 22:02 UTCVendor advisory
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  11. 2026-10-25 14:37 UTCEG score recompute
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-20 09:51 UTCEG score recompute
  18. 2026-10-20 09:51 UTCVendor advisory
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-18 03:49 UTCEG score recompute
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 70 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-12 15:49 UTCEG score recompute
  4. 2026-10-11 19:58 UTCEG score recompute
  5. 2026-10-11 17:11 UTCEG score recompute
  6. 2026-10-11 14:41 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-11 11:16 UTCOSV refresh
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-21 23:45 UTCOSV refresh
  23. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  28. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  29. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  30. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  31. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  32. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  33. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  34. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  35. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  36. 2026-09-02 19:10 UTCOSV refresh
  37. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  38. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  39. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  40. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  41. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  42. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  43. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  44. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  45. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  46. 2026-08-24 14:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  47. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  48. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  49. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  50. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  51. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  52. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  53. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  54. 2026-08-16 11:39 UTCEG score recompute
  55. 2026-08-16 11:39 UTCVendor advisory
  56. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  57. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  58. 2026-08-14 20:09 UTCVendor advisory
  59. 2026-08-14 07:41 UTCEG score recompute
  60. 2026-08-14 07:41 UTCVendor advisory
  61. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  62. 2026-08-12 22:39 UTCEG score recompute
  63. 2026-08-12 22:39 UTCVendor advisory
  64. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  65. 2026-08-11 21:41 UTCEG score recompute
  66. 2026-08-11 21:41 UTCVendor advisory
  67. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  68. 2026-08-11 04:49 UTCEG score recompute
  69. 2026-08-11 04:49 UTCVendor advisory
  70. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile

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Frequently asked(5)

What is CVE-2026-29774?
CVE-2026-29774 is a high-severity vulnerability; its CVE record was published on March 13, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a client-side heap buffer overflow occurs in the FreeRDP client's AVC420/AVC444 YUV-to-RGB conversion path due to missing horizontal bounds validation of H.264 metablock regionRects coordinates. In yuv.c, the clamp()…
When was the CVE record for CVE-2026-29774 published?
The CVE record for CVE-2026-29774 was published on March 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-29774 actively exploited?
CVE-2026-29774 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-29774?
CVE-2026-29774 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-29774?
A fix for CVE-2026-29774 is available: update to the fixed version the vendor names in its advisory.

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