# CVE-2026-120740: Hivex: hivex: denial of service via out-of-bounds read in big-data block processing

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

A flaw was found in hivex. By supplying a specially crafted Windows registry hive file, an attacker can trigger an out-of-bounds memory read when hivex parses registry values containing malformed large data block lists. This issue can cause the application processing the registry file to crash, resulting in a Denial of Service (DoS).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (hivex): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (hivex): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (hivex): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (virt-devel:rhel/hivex): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (virt:rhel/hivex): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (hivex): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 2 (low); CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-125

## Exploit evidence

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

## References

- https://access.redhat.com/security/cve/CVE-2026-120740 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2565405 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-120740; retrieved 2026-11-02; source updated 2026-11-02

Revision: 721d40f1ca5761d80bc679d0f0463da18018d4b1bceeb9cdb75caf1d86f3b47f

Canonical: https://y2.dev/cve/CVE-2026-120740

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