CVE-2026-40254: FreeRDP: contains_dotdot() off-by-one allows drive channel path traversal via terminal ..
Noroxi assessment
Priority: Monitor (action score 24/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
- Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
- Fixed version: freerdp3 (Debian:13) 3.15.0+dfsg-2.1+deb13u3; freerdp3 (Debian:14) 3.25.0+dfsg-1; freerdp (openSUSE:Leap 16.0) 3.26.0-160000.1.1.
Low priority for now. Upgrade to freerdp3 (Debian:13) 3.15.0+dfsg-2.1+deb13u3; freerdp3 (Debian:14) 3.25.0+dfsg-1; freerdp (openSUSE:Leap 16.0) 3.26.0-160000.1.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in `channels/drive/client/drive_file.c`. The `contains_dotdot()` function catches `../` and `..\` mid-path but misses `..` when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.
- Published
- Apr 23, 2026
- Updated
- Jun 17, 2026
- EPSS
- 0.2% · 10th percentile
- CWE
- CWE-193
Report tools
Action score
24
Monitor
Low priority for now.
- CVSS
- 24 / 40 · 6.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 6.1
- CNA · GitHub_M
- 4.2
- 1.9 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| freerdp | freerdp | cpe:2.3:a:freerdp:freerdp |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- freerdp freerdpbefore 3.25.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.
FreeRDP FreeRDP
- < 3.25.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | freerdp2 | from 0 | — |
| Debian:13 | freerdp3 | before 3.15.0+dfsg-2.1+deb13u3 | 3.15.0+dfsg-2.1+deb13u3 |
| Debian:14 | freerdp3 | before 3.25.0+dfsg-1 | 3.25.0+dfsg-1 |
| openSUSE:Leap 16.0 | freerdp | before 3.26.0-160000.1.1 | 3.26.0-160000.1.1 |
| openSUSE:Tumbleweed | freerdp | before 3.26.0-1.1 | 3.26.0-1.1 |
| SUSE:Linux Enterprise Module for Package Hub 15 SP7 | freerdp | before 3.10.3-150700.3.17.1 | 3.10.3-150700.3.17.1 |
| SUSE:Linux Enterprise Server 16.0 | freerdp | before 3.26.0-160000.1.1 | 3.26.0-160000.1.1 |
Same product
freerdp: all recordsOther highest-scoring records for the same primary product.
- CVE-2018-8787FreeRDP prior to version 2.0.0-rc4 contains an Integer Overflow that leads to a Heap-Based Buffer Overflow in function gdi_Bitmap_Decompress42Plan
- CVE-2018-8788FreeRDP prior to version 2.0.0-rc4 contains an Out-Of-Bounds Write of up to 4 bytes in function nsc_rle_decode() that results in a memory co41Plan
- CVE-2018-8786FreeRDP prior to version 2.0.0-rc4 contains an Integer Truncation that leads to a Heap-Based Buffer Overflow in function update_read_bitmap_41Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-33987Mar 30, 2026 · FreeRDP: Persistent Cache bmpSize Desync - Heap OOB Write26Monitor
- ← EarlierCVE-2026-33995Mar 30, 2026 · FreeRDP: Possible double free in kerberos_AcceptSecurityContext21Monitor
- Later →CVE-2026-40033May 26, 2026 · FreeRDP - Heap-buffer-overflow in gdi_CacheToSurface via rectangle validation bypass34Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:freerdp3 | 3.15.0+dfsg-2.1+deb13u3 · Debian:13 | Package registry (OSV) |
| opensuse:freerdp | 3.26.0-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:freerdp | 3.26.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-193 · Off-by-one ErrorCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
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