CVE-2026-31883

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 75% 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
Elevated
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: Elevated riskExposed: 0

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

March 13, 2026

Last Modified

June 17, 2026

Advisory Details (2)

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

`size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5
github_commit

commit 16df2300e1e3 (FreeRDP/FreeRDP)

Fix landed in FreeRDP/FreeRDP commit 16df2300e1e3 — awaiting tagged release

https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8

Vendor Advisories for CVE-2026-31883(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-2:3.10.3-3.el10_0.72026-05-26redhat
redhatfreerdp-0:2.1.1-5.el7_9.92026-05-26redhat
redhatfreerdp-2:2.2.0-14.el8_42026-05-20redhat
redhatfreerdp-2:3.10.3-12.el10_2.52026-05-19redhat
redhatfreerdp-2:2.11.7-7.el9_8.32026-05-19redhat
redhatfreerdp-2:2.11.7-1.el9_6.102026-05-13redhat
redhatfreerdp-2:2.2.0-12.el8_8.82026-05-13redhat
redhatfreerdp-2:2.11.7-1.el9_7.72026-05-13redhat
redhatfreerdp-2:2.11.2-1.el9_4.82026-05-13redhat
redhatfreerdp-2:2.2.0-7.el8_6.82026-05-13redhat
redhatfreerdp-2:2.4.1-6.el9_2.92026-05-12redhat
redhatfreerdp-2:2.4.1-3.el9_0.72026-05-12redhat
redhatfreerdp-2:2.11.7-9.el8_102026-05-11redhat
redhatfreerdp-2:3.10.3-5.el10_1.82026-05-11redhat

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 5× in last 7d / 31× 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. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 14:52 UTCEPSS rescore
  4. 2026-09-10 09:34 UTCEPSS rescore
  5. 2026-09-08 22:00 UTCEPSS rescore
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 19:10 UTCOSV refresh
  11. 2026-09-02 14:11 UTCEPSS rescore
  12. 2026-09-01 13:53 UTCEPSS rescore
  13. 2026-09-01 04:39 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-24 14:17 UTCEPSS rescore
  22. 2026-08-23 00:19 UTCEPSS rescore
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-20 22:55 UTCEPSS rescore
Show 66 more
  1. 2026-08-19 17:03 UTCEPSS rescore
  2. 2026-08-18 13:48 UTCEPSS rescore
  3. 2026-08-17 13:47 UTCEPSS rescore
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 11:41 UTCEG score recompute
  6. 2026-08-16 11:41 UTCVendor advisory
  7. 2026-08-16 02:14 UTCEPSS rescore
  8. 2026-08-15 01:30 UTCEPSS rescore
  9. 2026-08-14 23:53 UTCVendor advisory
  10. 2026-08-14 20:04 UTCVendor advisory
  11. 2026-08-14 15:21 UTCVendor advisory
  12. 2026-08-14 11:32 UTCVendor advisory
  13. 2026-08-14 07:42 UTCEG score recompute
  14. 2026-08-14 07:42 UTCVendor advisory
  15. 2026-08-13 22:00 UTCEPSS rescore
  16. 2026-08-13 02:30 UTCVendor advisory
  17. 2026-08-12 22:42 UTCEG score recompute
  18. 2026-08-12 22:42 UTCVendor advisory
  19. 2026-08-12 13:50 UTCEPSS rescore
  20. 2026-08-12 01:30 UTCVendor advisory
  21. 2026-08-11 21:42 UTCEG score recompute
  22. 2026-08-11 21:42 UTCVendor advisory
  23. 2026-08-11 08:39 UTCVendor advisory
  24. 2026-08-11 04:50 UTCEG score recompute
  25. 2026-08-11 04:50 UTCVendor advisory
  26. 2026-08-11 00:00 UTCEPSS rescore
  27. 2026-08-10 12:53 UTCVendor advisory
  28. 2026-08-10 08:31 UTCVendor advisory
  29. 2026-08-10 04:42 UTCVendor advisory
  30. 2026-08-10 00:53 UTCVendor advisory
  31. 2026-08-09 21:04 UTCVendor advisory
  32. 2026-08-09 17:15 UTCEG score recompute
  33. 2026-08-09 17:15 UTCVendor advisory
  34. 2026-08-09 13:46 UTCEPSS rescore
  35. 2026-08-09 13:26 UTCVendor advisory
  36. 2026-08-09 07:22 UTCVendor advisory
  37. 2026-08-08 09:16 UTCVendor advisory
  38. 2026-08-08 05:28 UTCVendor advisory
  39. 2026-08-08 01:39 UTCVendor advisory
  40. 2026-08-07 21:51 UTCVendor advisory
  41. 2026-08-07 18:02 UTCEG score recompute
  42. 2026-08-07 18:02 UTCVendor advisory
  43. 2026-08-06 19:48 UTCEG score recompute
  44. 2026-08-06 19:48 UTCVendor advisory
  45. 2026-08-06 13:46 UTCEPSS rescore
  46. 2026-08-06 09:35 UTCVendor advisory
  47. 2026-08-06 05:43 UTCVendor advisory
  48. 2026-08-06 01:55 UTCEG score recompute
  49. 2026-08-06 01:55 UTCVendor advisory
  50. 2026-08-05 19:17 UTCEPSS rescore
  51. 2026-08-04 15:10 UTCEPSS rescore
  52. 2026-08-04 10:38 UTCEPSS rescore
  53. 2026-08-04 05:00 UTCVendor advisory
  54. 2026-08-04 01:11 UTCVendor advisory
  55. 2026-08-03 01:16 UTCVendor advisory
  56. 2026-08-02 21:07 UTCVendor advisory
  57. 2026-08-02 17:19 UTCEG score recompute▲ 3.30
  58. 2026-08-02 17:19 UTCVendor advisory
  59. 2026-08-02 02:27 UTCEPSS rescore
  60. 2026-08-01 04:16 UTCEPSS rescore
  61. 2026-07-30 16:28 UTCEPSS rescore
  62. 2026-07-30 01:30 UTCEPSS rescore
  63. 2026-07-28 15:36 UTCEPSS rescore
  64. 2026-07-27 12:52 UTCEG score recompute
  65. 2026-07-27 12:52 UTCVendor advisory
  66. 2026-07-27 12:50 UTCOSV refresh

Frequently asked(5)

What is CVE-2026-31883?
CVE-2026-31883 is a critical vulnerability published on March 13, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a sizet underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header…
When was CVE-2026-31883 disclosed?
CVE-2026-31883 was first published in the National Vulnerability Database on March 13, 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-2026-31883 actively exploited?
CVE-2026-31883 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 75.5% of all scored CVEs.
What is the CVSS score of CVE-2026-31883?
CVE-2026-31883 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-31883?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-31883, 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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