CVE-2026-10725 – Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb

CVE ID :CVE-2026-10725

Published : June 6, 2026, 10:16 a.m. | 16 minutes ago

Description :Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb.

Protocol::HTTP2’s inbound HPACK path has no header-list size limit, so a small HTTP/2 request can expand into large server memory (the “HTTP/2 bomb”).

The headers_decode method materialises a full key+value copy per indexed reference with no running size check, and the stream_header_block_add method appends (since version 1.12) every CONTINUATION frame to the per-stream buffer unbounded.

MAX_HEADER_LIST_SIZE (default 65536) is advertised in SETTINGS but never consulted on decode. It is absent from the decoder and from the :limits export tag.

Severity: 0.0 | NA

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