CVE-2026-109854 M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding
Attackers can trigger uninitialized stack reads in M17n-lib during ISO-2022 decoding, potentially leaking sensitive memory contents to applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-109854?
CVE-2026-109854 is a low-severity vulnerability in Red Hat Enterprise Linux 10, published on 13 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A flaw was found in m17n-lib. An attacker who supplies crafted input to an application processing ISO-2022 encoded text can cause the library to read uninitialized memory from the stack. If the application exposes or returns the decoded output, this flaw can result in unexpected behavior and limited information disclosure.
Weakness: CWE-457
Which versions are affected by CVE-2026-109854?
How do I fix CVE-2026-109854?
Apply the vendor's patch.
Is CVE-2026-109854 being exploited?
There is no known exploitation of CVE-2026-109854 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-109854, GHSA-2f3f-m2rp-937p, UBUNTU-CVE-2026-109854.