CVE-2026-102474

A heap out-of-bounds write vulnerability exists in dash within the conv_escape function. The printf builtin incorrectly reserves only four bytes for converting Unicode \u or \U escapes , even though multi-byte tokens may require five or six bytes. A local user can trigger this by supplying such e...

CVE-2026-102474 Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservation

A flaw was found in dash. The printf builtin reserves four bytes before converting a Unicode \u or \U escape, but the multi-byte token can need five or six bytes. A local user who can supply such an escape to dash printf or echo %b, including through dash -c and a positional argument, can write o...