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.
CVE-2026-31883
MEDIUMNVD 9.86.5Trending — 3 sources updated this weekElevated
EchelonGraph scoreLOW confidence
This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
6.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 6.5(low)
- EG Risk
- 60(Attend)EG Risk 60/100SSVC: 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 computedSeverity65% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 0%
- EPSS %ILE
- 24%
- KEV
- Not listed
Published
March 13, 2026
Last Modified
June 17, 2026
Advisory Details (2)
Auto-updated Jul 27, 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-xhm5github_commit
commit 16df2300e1e3 (FreeRDP/FreeRDP)
Fix landed in FreeRDP/FreeRDP commit 16df2300e1e3 — awaiting tagged release
https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8Vendor 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.
- RHSA-2026:20605Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:20546Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:19811Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:19358Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:19142Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:16865Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:16866Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- RHSA-2026:16814Red Hat Product SecurityMedium
Red Hat Security Advisory: freerdp security update
- +6 more
Patch Availability(14)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | freerdp-2:3.10.3-3.el10_0.7 | 2026-05-26 | redhat |
| redhat | freerdp-0:2.1.1-5.el7_9.9 | 2026-05-26 | redhat |
| redhat | freerdp-2:2.2.0-14.el8_4 | 2026-05-20 | redhat |
| redhat | freerdp-2:3.10.3-12.el10_2.5 | 2026-05-19 | redhat |
| redhat | freerdp-2:2.11.7-7.el9_8.3 | 2026-05-19 | redhat |
| redhat | freerdp-2:2.11.7-1.el9_6.10 | 2026-05-13 | redhat |
| redhat | freerdp-2:2.2.0-7.el8_6.8 | 2026-05-13 | redhat |
| redhat | freerdp-2:2.2.0-12.el8_8.8 | 2026-05-13 | redhat |
| redhat | freerdp-2:2.11.7-1.el9_7.7 | 2026-05-13 | redhat |
| redhat | freerdp-2:2.11.2-1.el9_4.8 | 2026-05-13 | redhat |
| redhat | freerdp-2:2.4.1-3.el9_0.7 | 2026-05-12 | redhat |
| redhat | freerdp-2:2.4.1-6.el9_2.9 | 2026-05-12 | redhat |
| redhat | freerdp-2:2.11.7-9.el8_10 | 2026-05-11 | redhat |
| redhat | freerdp-2:3.10.3-5.el10_1.8 | 2026-05-11 | redhat |
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.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 3× in last 7d / 3× 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.
- 2026-07-27 12:52 UTCEG score recompute
- 2026-07-27 12:52 UTCVendor advisory
- 2026-07-27 12:50 UTCOSV refresh
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat
- CVE-2001-0825EG 10.0HIGH
- CVE-2001-1009EG 10.0EPSS p93HIGH
- CVE-2001-0554EG 10.0EPSS p98HIGH
- CVE-2001-1162EG 10.0EPSS p96HIGH
- CVE-2001-0414EG 10.0EPSS p100HIGH
- CVE-2001-0191EG 10.0EPSS p92HIGH
- CVE-2001-0301EG 10.0EPSS p90HIGH
- CVE-2001-0197EG 10.0EPSS p96HIGH
- CVE-2001-0233EG 10.0EPSS p96HIGH
- CVE-2001-0010EG 10.0EPSS p98HIGH
Same CWE
10 shownCWE-191 · CWE-122
- CVE-2007-0063EG 10.0EPSS p97HIGH
- CVE-2016-9603NVD 5.5EG 9.9EPSS p90CRITICAL
- CVE-2006-10003EG 9.8CRITICAL
- CVE-2006-10002NVD 7.5EG 9.8CRITICAL
- CVE-2018-11930EG 9.8CRITICAL
- CVE-2014-9187EG 9.8CRITICAL
- CVE-2018-14794EG 9.8CRITICAL
- CVE-2018-14618NVD 7.5EG 9.8EPSS p95CRITICAL
- CVE-2016-8622NVD 3.7EG 9.8EPSS p91CRITICAL
- CVE-2018-14353EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2026-31883?
CVE-2026-31883 is a medium 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 75.9% 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). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5. The EG score is currently aggregating — additional source signals are being incorporated as they become available..
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
Explore the affected products and dependency analysis for CVE-2026-31883
Is Your Infrastructure Affected by CVE-2026-31883?
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