CVE-2026-110714 libsmb2 through 6.2 Heap Out-of-Bounds Read via decode_acl Integer Underflow
A malicious SMB server can crash the libsmb2 client by sending crafted security descriptors that trigger an integer underflow and heap out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110714?
CVE-2026-110714 is a high-severity vulnerability in sahlberg libsmb2, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
libsmb2 through 6.2 contains an integer underflow vulnerability in decode_acl that allows malicious SMB servers to trigger heap out-of-bounds reads via crafted security descriptors. Attackers controlling a server or intercepting unsigned sessions can send an AclSize below 8 in a QUERY_INFO reply, bypassing ACE bounds checks and crashing the client.
Weakness: CWE-191
Which versions are affected by CVE-2026-110714?
How do I fix CVE-2026-110714?
No fix has been published for CVE-2026-110714 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-110714 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110714 exists.
Sources
Also known as DEBIAN-CVE-2026-110714, GHSA-f7hf-m5cf-j6wv, UBUNTU-CVE-2026-110714.