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Fencer Intel
low 2.5

CVE-2026-109854 json

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

published 27d ago modified 3d ago also EUVD-2026-98377

cvss
2.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

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.

Patch / fix

  • m17n-lib Debian 14 1.8.7-1

debian advisories DEBIAN-CVE-2026-109854

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-109854 updated cvss 2.5

m17n-lib: Uninitialized stack read in ISO-2022 Compound Text UTF-8 decoding

  • Red Hat Enterprise Linux 6 m17n-lib 1.8.4-7.el10
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 m17n-lib-tools, m17n-lib 1.8.4-7.el10 Red Hat Enterprise Linux 8 m17n-lib 1.8.4-7.el10 Red Hat Enterprise Linux 9 m17n-lib 1.8.4-7.el10 Red Hat Enterprise Linux 10 m17n-lib 1.8.4-7.el10
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
24d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 2.5 CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-457 Use of Uninitialized Variable

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.