sqlmapproject/sqlmap · error · ValueError

truncated DER header

Error message

truncated DER header

What it means

Error "truncated DER header" thrown in sqlmapproject/sqlmap.

Source

Thrown at extra/kerberos/der.py:99

    return _tlv(GENERALIZED_TIME, value if isinstance(value, bytes) else value.encode("ascii"))

def bitString(value, unusedBits=0):
    return _tlv(BIT_STRING, bytearray([unusedBits]) + bytearray(value))

def sequence(*elements):
    return _tlv(SEQUENCE, b"".join(bytes(_) for _ in elements))

def sequenceOf(elements):
    return _tlv(SEQUENCE, b"".join(bytes(_) for _ in elements))

# ---- decoding -------------------------------------------------------------------------------------
def peel(data, offset=0):
    """Parse one TLV at 'offset'; return (tag, content_bytearray, next_offset). Raises ValueError on
    truncated or indefinite-length input (the data may come from the network, so fail predictably)."""

    data = bytearray(data)
    if offset + 2 > len(data):
        raise ValueError("truncated DER header")
    tag = data[offset]
    first = data[offset + 1]
    offset += 2
    if first < 0x80:
        length = first
    elif first == 0x80:
        raise ValueError("indefinite-length DER is not permitted")
    else:
        count = first & 0x7f
        if offset + count > len(data):
            raise ValueError("truncated DER length")
        length = 0
        for _ in range(count):
            length = (length << 8) | data[offset]
            offset += 1
    if offset + length > len(data):
        raise ValueError("truncated DER content")
    return tag, data[offset:offset + length], offset + length

View on GitHub (pinned to 0a35b20e39)

When it happens

Trigger: Thrown at extra/kerberos/der.py:99 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of sqlmapproject/sqlmap@0a35b20e39 (2026-08-26). Data as JSON: /api/errors/8e5a0838874112a4. Report an issue: GitHub.