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CVE-2026-48111 is an off-by-one out-of-bounds read in 7-Zip’s UEFI firmware image parser affecting versions 9.21 through 26.00. The flaw is in the ParseDepedencyExpression function in the UEFI handler, where an attacker-controlled opcode is validated with a greater-than comparison instead of a greater-than-or-equal comparison against the 10-element kExpressionCommands array. As a result, an opcode value equal to the array length is incorrectly accepted and causes the parser to read one pointer-sized slot past the end of the static command table. The out-of-bounds value is then treated as a string pointer and passed to string-handling routines while populating archive metadata. The vulnerable code path is reachable automatically during archive opening through the UEFI parsing flow when processing dependency-expression sections in crafted UEFI firmware images, and the UEFI handler is enabled by default through signature-based format detection.
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