# CVE-2026-107167: M17n-lib: heap use-after-free write in re_init_ic()

Status: published. Published: 2026-10-07. Updated: 2026-11-05.

A flaw was found in m17n-lib. A user providing specially crafted text input can trigger a heap use-after-free condition during input-method state transitions. Under specific conditions, the library frees an internal input context object but subsequently attempts to write to that freed memory. This issue can cause applications relying on the library to crash, leading to a Denial of Service (DoS), or potentially allow arbitrary code execution.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (m17n-lib): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (m17n-lib): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (m17n-lib): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (m17n-lib): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (m17n-lib): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.12% as of 2026-11-05; percentile 1.92%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/security/cve/CVE-2026-107167 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2547408 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-107167 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2547408 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-107167; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107167; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-107167; retrieved 2026-11-05; source updated Not reported

Revision: 1e7fe6aba739fc1c6c87ff5cbffc39d2c391d2f97c8cee0da852ca4fb40dc9aa

Canonical: https://y2.dev/cve/CVE-2026-107167

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