| タイトル | GPAC up to commit f1219cde (2026-07-25) Denial of Service |
|---|
| 説明 | A vulnerability was found in GPAC up to commit f1219cde (2026-07-25) and classified as problematic. Affected is the function lsr_exec_command_list in the LASeR decoder of the component MP4Box. The manipulation via a crafted MP4 file processed with the -bt argument leads to a reachable assertion failure (assert(!codec->bs)) that causes an immediate process abort. It is possible to launch the attack locally. User interaction is required.
Technical Details
- Affected file/function: laser/lsr_dec.c:5943 / lsr_exec_command_list
- Vulnerable parameter: Malformed LASeR scene data with undefined event types (62, 50, 33) and incomplete mdat box
- Attack vector: Local
- Privileges required: None
- Trigger condition: Processing a crafted MP4 file with "MP4Box -bt" triggers LASeR scene parsing. Undefined LASeR events and an incomplete mdat box corrupt the decoder state, leaving the codec bitstream object uncleaned after command list execution, violating assert(!codec->bs) at lsr_dec.c:5943. Requires --enable-debug build.
Impact
- Confidentiality: None
- Integrity: None
- Availability: High
CVSS v3.1
Score: 5.5 (Medium)
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Timeline
- Discovered: 2026-07-27
- Vendor notified: 2026-07-27
- Patch released: 2026-07-28
- Public disclosure: 2026-07-27
Countermeasure
Apply the upstream patch. Replace the reachable assertion with proper error handling that checks and cleans up existing bitstream state before re-initialization. |
|---|
| ソース | ⚠️ https://github.com/r1ck9-2q/cve_summit/blob/main/Vuln%20GPAC%20MP4Box%20Assertion%20Failure%20assert(!codec-bs).md |
|---|
| ユーザー | Dem0000000 (UID 98743) |
|---|
| 送信 | 2026年08月03日 14:43 (1 月 ago) |
|---|
| モデレーション | 2026年09月13日 06:55 (1 month later) |
|---|
| ステータス | 承諾済み |
|---|
| VulDBエントリ | 403218 [GPAC 迄 f1219cde MP4Box laser/lsr_dec.c lsr_exec_command_list サービス拒否] |
|---|
| ポイント | 20 |
|---|