Application crash via overflowing PSSH size calculation
Published Jun 15, 2026 · Updated Jun 15, 2026
Integer overflow in GPAC MP4Box 2.4 allows attackers to crash the application by supplying a crafted MP4 file during DASH segmentation. The mp4_mux_cenc_insert_pssh function trusts attacker-controlled kid_count and dataSize values in PSSH metadata when calculating a realloc size, producing an enormous allocation request. Processing the file with the DASH segmentation path requires user interaction and exhausts memory; no authentication or special privileges are required.
Summary
What happened
Integer overflow in GPAC MP4Box 2.4 allows attackers to crash the application by supplying a crafted MP4 file during DASH segmentation. The mp4_mux_cenc_insert_pssh function trusts attacker-controlled kid_count and dataSize values in PSSH metadata when calculating a realloc size, producing an enormous allocation request. Processing the file with the DASH segmentation path requires user interaction and exhausts memory; no authentication or special privileges are required.
The record
- CVE
- CVE-2025-55647
- Published
- Jun 15, 2026
- Updated
- Jun 15, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190, T1499
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 15, 2026CVE publishedPublication date reported by the CVE source.
- Jun 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- MP4Box oversized PSSH proof-of-concept fileproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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