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Vulnerability · Published Oct 13, 2026 · Assigned by redhat

CVE-2026-109854M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding

Low 2.5

In plain English

A low-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)2.5Low
Exploit odds (30 days)0.1%top 98.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12m17n-libno fix listedDEBIAN-CVE-2026-109854
Debian:13m17n-libno fix listedDEBIAN-CVE-2026-109854
Debian:14m17n-lib1.8.7-1DEBIAN-CVE-2026-109854
Ubuntu:22.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-109854
Ubuntu:24.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-109854
Ubuntu:26.04:LTSm17n-libno fix listedUBUNTU-CVE-2026-109854
Ubuntu:26.10m17n-libno fix listedUBUNTU-CVE-2026-109854

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-457 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

References