CVE-2026-10725

Name	CVE-2026-10725
Description	Protocol::HTTP2 versions before 1.13 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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libprotocol-http2-perl (PTS)	bullseye	1.10-1	vulnerable
	bookworm	1.10-2	vulnerable
	trixie	1.11-1	vulnerable
	forky, sid	1.13-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libprotocol-http2-perl	source	(unstable)	1.12-2

Notes

[trixie] - libprotocol-http2-perl <no-dsa> (Minor issue)
[bookworm] - libprotocol-http2-perl <no-dsa> (Minor issue)
[bullseye] - libprotocol-http2-perl <postponed> (Minor issue)
https://lists.security.metacpan.org/cve-announce/msg/40751319/
https://security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r1.patch