Code execution via stale JP2 dimensions
Published Sep 9, 2026 · Updated Sep 10, 2026
Heap buffer overflow in GPAC allows attackers to execute arbitrary code through a crafted JP2 file processed by the JPEG 2000 decoder. In j2kdec_process(), JP2 ihdr dimensions size ctx->out_size, but codestream dimensions replace them after decoding without recalculating that allocation. Exploitation requires GPAC to decode a JP2 whose ihdr box declares smaller dimensions than its SIZ marker; the demonstrated result is a crash, while the CVE record states arbitrary code execution.
Summary
What happened
Heap buffer overflow in GPAC allows attackers to execute arbitrary code through a crafted JP2 file processed by the JPEG 2000 decoder. In j2kdec_process(), JP2 ihdr dimensions size ctx->out_size, but codestream dimensions replace them after decoding without recalculating that allocation. Exploitation requires GPAC to decode a JP2 whose ihdr box declares smaller dimensions than its SIZ marker; the demonstrated result is a crash, while the CVE record states arbitrary code execution.
The record
- CVE
- CVE-2026-71613
- Published
- Sep 9, 2026
- Updated
- Sep 10, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1203
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 9, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
- gen_poc2.py crafted-JP2 proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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