L-SMASH up to 2.14.5 MOV File core/read.c isom_read_hdlr/isom_read_dref_entry out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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4.9$0-$5k0.41+

Summaryinfo

A vulnerability was found in L-SMASH up to 2.14.5 and classified as problematic. This affects the function isom_read_hdlr/isom_read_dref_entry of the file core/read.c of the component MOV File Handler. Such manipulation leads to out-of-bounds write. This vulnerability is referenced as CVE-2026-120456. The attack can only be performed from a local environment. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in L-SMASH up to 2.14.5. Affected by this issue is the function isom_read_hdlr/isom_read_dref_entry of the file core/read.c of the component MOV File Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is integrity, and availability. CVE summarizes:

L-SMASH through 2.14.5 contains a heap out-of-bounds write vulnerability in isom_read_hdlr() and isom_read_dref_entry() in core/read.c triggered by oversized box sizes. Attackers can supply crafted MP4 or MOV files declaring hdlr or url box sizes larger than remaining data, stalling the stream position and corrupting heap memory to crash applications.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-120456 since 11/02/2026. The exploitation is known to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 3.9
VulDB Temp Score: 3.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/02/2026 Advisory disclosed
11/02/2026 +0 days CVE reserved
11/02/2026 +0 days VulDB entry created
11/02/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Not defined

CNA: VulnCheck
CVE: CVE-2026-120456 (🔒)

GCVE (CVE): GCVE-0-2026-120456
GCVE (VulDB): GCVE-100-429860

Entryinfo

Created: 11/02/2026 15:51
Changes: 11/02/2026 15:51 (75)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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