CVE-2026-22857: freerdp Use After Free
CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-22857DEBIAN-CVE-2026-22857CGA-chw6-hhw4-2rppCGA-fcrm-m4gw-cmvhCGA-mhcx-4qcf-rfhcCGA-wr6g-3j69-7m5m
Published 14-01-2026Last modified 26-02-2026
Vulnerability summary
CVE-2026-22857 is a critical (CVSS 9.8) Use After Free vulnerability in freerdp. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.7% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
0.53%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 10 · Related 9Timeline
- 14-01-2026PublishedVulnerability first disclosed.
- 26-02-2026Last modifiedVulnerability information updated.
Description
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a heap use-after-free occurs in irp_thread_func because the IRP is freed by irp->Complete() and then accessed again on the error path. This vulnerability is fixed in 3.20.1.
CVSS metrics
8 scores · 6 sources · 2 versionsMedium 6.8Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:PSources5 sources · 6.8–7.7
- OSV · UbuntuEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- OSV · WolfiEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- OSV · ChainguardEcosystem advisory · calculated7.7HighCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:PDiffers
- NVDNIST6.8MediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/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 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.53%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
+0.01 pp
From 0.52% on 20-09-2026
20-09-202620-10-2026
EPSS score0.53%
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
8 links- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-4gxq-jhq6-4cr8X Refsource CONFIRMREPORTAdvisoryExploitVendor Advisory
