---
title: "CVE-2026-110599: L-SMASH - Use After Free"
description: "L-SMASH through 2.14.5 contains a use-after-free vulnerability caused by double free in hevc_setup_first_summary() and h264_setup_first_summary() in importer/nalu_imp.c, letting attackers cause heap corruption and crashes by supplying crafted Annex-B streams, exploit requires crafted input stream."
url: https://panop.io/threat-heartbeat/CVE-2026-110599/
---

# CVE-2026-110599 L-SMASH - Use After Free

L-SMASH through 2.14.5 contains a use-after-free vulnerability caused by double free in hevc\_setup\_first\_summary() and h264\_setup\_first\_summary() in importer/nalu\_imp.c, letting attackers cause heap corruption and crashes by supplying crafted Annex-B streams, exploit requires crafted input stream.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-110599)

## Details

Type

Use After Free

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Published

14 October 2026

Updated

15 October 2026

Weakness

[CWE-415](https://cwe.mitre.org/data/definitions/415.html)

## Vendor fix

Update to the latest version beyond 2.14.5.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-110599](https://nvd.nist.gov/vuln/detail/CVE-2026-110599)
- [https://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-free](https://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-free)
- [https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu\_imp.c#L1356-L1378](https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L1356-L1378)
- [https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu\_imp.c#L697-L715](https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L697-L715)
- [https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free](https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free)
- [https://www.vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-264-importer-probe](https://www.vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-264-importer-probe)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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