CVE-2026-22855: freerdp Out-of-bounds Read
CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2026-22855DEBIAN-CVE-2026-22855CGA-2gqw-w47q-p6q3CGA-ffjr-wj58-v7mrCGA-j4x5-7w5f-8vg7CGA-j7v9-5wm7-rp4v
Published 14-01-2026Last modified 19-08-2026
Vulnerability summary
CVE-2026-22855 is a critical (CVSS 9.1) Out-of-bounds Read vulnerability in freerdp. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.8% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.1/10
010
Critical · v3.1 (NVD)EPSS score
0.89%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 23 · Related 9MGASA-2026-0086OPENSUSE-SU-2026:10059-1OPENSUSE-SU-2026:10459-1OPENSUSE-SU-2026:20339-1RHSA-2026:19033RHSA-2026:3067RHSA-2026:3068RHSA-2026:3334RHSA-2026:3975RHSA-2026:4121RHSA-2026:4437RHSA-2026:4438RHSA-2026:4439RHSA-2026:4440RHSA-2026:4446RHSA-2026:4471RHSA-2026:4489SUSE-SU-2026:0345-1SUSE-SU-2026:0656-1SUSE-SU-2026:0683-1SUSE-SU-2026:0761-1SUSE-SU-2026:0762-1USN-8105-1
Timeline
- 14-01-2026PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap out-of-bounds read occurs in the smartcard SetAttrib path when cbAttrLen does not match the actual NDR buffer length. This vulnerability is fixed in 3.20.1.
CVSS metrics
9 scores · 6 sources · 2 versionsMedium 5.6Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:PSources5 sources · 5.6–6.1
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- OSV · WolfiEcosystem advisory · calculated6.1MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- OSV · ChainguardEcosystem advisory · calculated6.1MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- NVDNIST5.6MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Critical 9.1Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:HSources4 sources · 7.4–9.1
- CVE.orgCNA7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.4HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:HDiffers
- OSV · DebianEcosystem advisory · calculated9.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.89%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
+0.02 pp
From 0.87% on 21-09-2026
21-09-202621-10-2026
EPSS score0.89%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundFreerdp
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Ubuntu3 products
- freerdpAll versions (No fix recorded)
- freerdp2All versions (No fix recorded)
- freerdp3< 3.5.1+dfsg1-0ubuntu1.4 | < 3.16.0+dfsg-2ubuntu0.3 | < 3.20.2+dfsg-1
Chainguard2 products
- freerdp-devAll versions (No fix recorded)
- freerdp-libsAll versions (No fix recorded)
Debian2 products
- freerdp2All versions (No fix recorded)
- freerdp3< 3.15.0+dfsg-2.1+deb13u1 | < 3.20.2+dfsg-1
Wolfi2 products
- freerdp-devAll versions (No fix recorded)
- freerdp-libsAll versions (No fix recorded)
Freerdp1 product
- freerdp< 3.20.1
5 vendors · 10 products
References
24 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rwp3-g84r-6mx9X Refsource CONFIRMREPORTAdvisoryExploitVendor Advisory
