# CVE-2026-108063: Libhangul: null pointer dereference in hanja_new() when looking up a malformed hanja dictionary entry

Status: published. Published: 2026-10-09. Updated: 2026-11-05.

A flaw was found in libhangul. When parsing Hanja dictionary files, the library fails to verify that an entry contains a valid value alongside its key. By providing a specially crafted dictionary file to an application that queries it, an attacker can trigger an unexpected application crash, resulting in a Denial of Service (DoS).

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

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 1.72%

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

- Weaknesses: CWE-476

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-108063 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://github.com/libhangul/libhangul/blob/5094421d9586294b2aad09924b9a54e2e6060f06/hangul/hanja.c (CNA: redhat)

- https://github.com/libhangul/libhangul/issues/106 (CNA: redhat)

- https://access.redhat.com/security/cve/CVE-2026-108063 (secalert@redhat.com)

- https://github.com/libhangul/libhangul/blob/5094421d9586294b2aad09924b9a54e2e6060f06/hangul/hanja.c (secalert@redhat.com)

- https://github.com/libhangul/libhangul/issues/106 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-108063; retrieved 2026-11-05; source updated 2026-11-05

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-108063; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-108063; retrieved 2026-11-05; source updated Not reported

Revision: 7ab1aa0bff33c2b4a97d65f63f0420f3f70d49ccd3a8a9fbbd468545be70df46

Canonical: https://y2.dev/cve/CVE-2026-108063

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