CVE-2026-40930: Apng Unconsumed Chunk Smuggling
A chunk discard path in the push-mode parser clears the PNG_HAVE_CHUNK_HEADER state without calling png_crc_finish() or consuming the chunk payload. This leaves raw unconsumed bytes in the stream, parsing them as a new chunk on the next iteration and enabling chunk smuggling. Ensure the chunk body and CRC are consumed before clearing the state flag.
Cgreprules fetch cve-2026-40930-apng-unconsumed-chunk-smuggling --engine opengrepDescription
A chunk discard path in the push-mode parser clears the PNG_HAVE_CHUNK_HEADER state without calling png_crc_finish() or consuming the chunk payload. This leaves raw unconsumed bytes in the stream, parsing them as a new chunk on the next iteration and enabling chunk smuggling. Ensure the chunk body and CRC are consumed before clearing the state flag.
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