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CVE-2026-109854

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

2.5 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.12%Unchanged since Oct 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.5

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

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.

Record
CVE-2026-109854
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-457
Updated
2026-11-06
EUVDEUVD-2026-98377 2.5

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.

Record
EUVD-2026-98377
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated
2026-11-06
GitHub AdvisoriesGHSA-2f3f-m2rp-937p 2.5

A flaw was found in m17n-lib. An attacker who supplies crafted input to an application processing...

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.

Record
GHSA-2f3f-m2rp-937p
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-457
Updated
2026-11-02
NVD 2.5

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.

Record
CVE-2026-109854
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-457
Updated
2026-11-06
OSV 2.5

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

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.

Record
CVE-2026-109854
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weakness
CWE-457
Updated
2026-11-02
OSVDEBIAN-CVE-2026-109854 2.5

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.

Record
DEBIAN-CVE-2026-109854
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated
2026-11-07
OSVUBUNTU-CVE-2026-109854 2.5

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.

Record
UBUNTU-CVE-2026-109854
CVSS 3.1
2.5 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
m17n-lib
Debian:12
 All versions, plus listed versions
1.8.0-61.8.2-11.8.3-11.8.3-21.8.4-1
Show 4 moreShow less
1.8.4-21.8.5-11.8.6-11.8.7-1
 None known
m17n-lib
Debian:13
 All versions, plus listed versions
1.8.5-11.8.6-11.8.7-1
 None known
m17n-lib
Debian:14
 before 1.8.7-1, plus listed versions
1.8.5-11.8.6-1
1.8.7-1
m17n-lib
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.6.4-31.7.0-11.7.0-21.7.0-3
 None known
m17n-lib
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.7.0-31.7.0-3build1
 None known
m17n-lib
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.8.0-2
 None known
m17n-lib
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.8.0-2build11.8.0-31.8.0-3build11.8.0-3.11.8.0-4
 None known
m17n-lib
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.8.4-11.8.4-1build11.8.4-1build2
 None known
m17n-lib
Ubuntu:26.10
 All versions, plus listed versions
1.8.6-1
 None known
m17n-lib
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.8.5-1build11.8.6-1
 None known

History

History
RecordedChangedSources
factsCVE List
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-109854 is a low vulnerability (CVSS 2.5) in Red Hat Enterprise Linux 10, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in m17n-lib 1.8.7-1.

References

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