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.
History

Sat, 06 Jun 2026 10:00:00 +0000

Type Values Removed Values Added
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.
Title Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb
Weaknesses CWE-409
References

cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-06-06T11:31:33.020Z

Reserved: 2026-06-03T09:18:37.572Z

Link: CVE-2026-10725

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-06T10:16:25.790

Modified: 2026-06-06T10:16:25.790

Link: CVE-2026-10725

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-06T11:30:19Z