What is CVE-2026-109677?

CVE-2026-109677 is a medium-severity vulnerability in Freerdp, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-10-13.

How severe is CVE-2026-109677?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Out-of-bounds Read in Freerdp

CVE-2026-109677

FreeRDP from 2.0.0-beta1 before 3.28.0 contains an out-of-bounds read vulnerability in smartcard_LocateCardsByATRA_Call because the ATR pattern cbAtr byte count is not capped. Malicious RDP servers can send crafted ATR mask arrays to use query timing as an oracle, leaking heap memory bit-by-bit to defeat ASLR and aid RCE exploits.

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Freerdp

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8m97-wwx3-r8vj (vendor-advisory)
github.com/FreeRDP/FreeRDP/commit/ececc5cbd0646ef012ca178322e6ef922a11f0c1 (patch)
www.vulncheck.com/advisories/freerdp-2.0.0-beta1-before-3.28.0-out-of-bounds-re… (third-party-advisory)

Frequently asked questions

What is CVE-2026-109677?: CVE-2026-109677 is a medium-severity vulnerability in Freerdp, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-10-13.
How severe is CVE-2026-109677?: Medium severity. CVSS v3 base score is 6.5 out of 10.