CVE-2026-120456 Details
Description
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.
A heap out-of-bounds write vulnerability has been identified in L-SMASH version 2.14.5. This issue arises in the 'isom_read_hdlr()' and 'isom_read_dref_entry()' functions within 'core/read.c'. The vulnerability is triggered by oversized box sizes in MP4 or MOV files, specifically those declaring hdlr or url box sizes larger than the remaining data. This can lead to heap memory corruption, causing applications to crash.
Users can upgrade to L-SMASH version 2.14.6 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 2, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L688-L717 | [email protected] | Source CodeVendor |
| https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L853-L876 | [email protected] | Source CodeVendor |
| https://github.com/l-smash/l-smash/commit/805ee3c9632e054198d3cb5b09c7b7aa36cdd791 | [email protected] | Source CodeVendor |
| https://github.com/l-smash/l-smash/issues/112 | [email protected] | Issue TrackingTechnical DescriptionVendor |
| https://hackmd.io/@haindpwn/lsmash-hdlr-dref-box-size-oob-write | [email protected] | ExploitTechnical Analysis |
| https://www.vulncheck.com/advisories/l-smash-through-2.14.5-heap-out-of-bounds-write-via-hdlr-and-url-boxes | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| L-SMASH | <= 2.14.5 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Nov 2, 2026 | New CVE Received | [email protected] |