CVE-2026-10725

HIGH 7.5

Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

5th

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.

CWE	CWE-409
Vendor	crux
Product	protocol::http2
Published	Jun 6, 2026
Last Updated	Jun 9, 2026

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Affected Versions

CRUX / Protocol::HTTP2

0 < 1.13

References

NVD ↗ CVE.org ↗ EPSS Data ↗

metacpan.org: https://metacpan.org/release/CRUX/Protocol-HTTP2-1.13/changes metacpan.org: https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/HeaderCompression.pm#L133 metacpan.org: https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/Stream.pm#L414 github.com: https://github.com/vlet/p5-Protocol-HTTP2/commit/822bf22224adbd662e8d0b865eeacb2b294d16cd.patch security.metacpan.org: https://security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r2.patch openwall.com: http://www.openwall.com/lists/oss-security/2026/06/06/7