CVE-2026-109679

MEDIUM 6 PoC AVAILABLE

Published 2026-10-13 · Last modified 2026-10-18

FreeRDP 3.0.0-beta4 before 3.32.0 contains a NULL pointer dereference in arm_handle_request_ok when an ARM endpoint returns an empty HTTP 200 body. Attackers controlling the configured ARM gateway can return a zero-length body to pass NULL to strnlen and crash the connecting client.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 16th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

6CVSS 4.0 · MEDIUM

ConfidentialityNone
IntegrityNone
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
⚠User interaction: Succeeds with passive user activity
✓Complexity: No special conditions — reliably repeatable
⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

reference https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qjwp-c855-hc69
github-search Search GitHub for public PoC repos

Test against your own equipment

curl -s https://vulnpedia.com/cve/CVE-2026-109679/poc.jsonMachine-readable PoC index for this CVE (for automation).

Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-109679/poc.json

Affected

Vendors Freerdp

Products Freerdp

Weakness (CWE)

CWE-476: NULL Pointer Dereference

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Known Affected Software Configurations

Vendor	Product	Version range
Freerdp	Freerdp	> 3.0.0 and < 3.32.0
Freerdp	Freerdp	3.0.0
Freerdp	Freerdp	3.0.0

All CVSS metrics

MEDIUM 6 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
MEDIUM 5.3 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
MEDIUM 6 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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
MEDIUM 5.3 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Exploits & PoC

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qjwp-c855-hc69 vendor-advisoryexploitExploitVendor Advisory

Advisories

https://www.vulncheck.com/advisories/freerdp-3.0.0-beta4-before-3.32.0-null-pointer-crash-via-arm-response third-party-advisoryThird Party Advisory

Sources: NVD · CVE.org · EPSS