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

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Summary

CVECVE-2026-10725
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-06 10:16:25 UTC
Updated2026-06-06 12:16:39 UTC
DescriptionProtocol::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.

Risk And Classification

Problem Types: CWE-409 | CWE-409 CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA CRUX ProtocolHTTP2 affected 1.12 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/He... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/St... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org
www.openwall.com/lists/oss-security/2026/06/06/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Workarounds

CNA: Apply the patch.

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