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.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| CRUX | Protocol::HTTP2 | unaffected |
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| Vendors | Products |
|---|---|
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Crux
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Protocol::http2
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Solution
No solution given by the vendor.
Workaround
Apply the patch.
Tue, 09 Jun 2026 08:30:00 +0000
| Type | Values Removed | Values Added |
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| References |
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Tue, 09 Jun 2026 07:45:00 +0000
| Type | Values Removed | Values Added |
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| 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. | 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. |
| Title | Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb | Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb |
| References |
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Mon, 08 Jun 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
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Sun, 07 Jun 2026 11:30:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Crux
Crux protocol::http2 |
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| Vendors & Products |
Crux
Crux protocol::http2 |
Sat, 06 Jun 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
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| References |
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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 |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-06-09T07:20:32.184Z
Reserved: 2026-06-03T09:18:37.572Z
Link: CVE-2026-10725
Vulnrichment
Updated: 2026-06-06T11:31:33.020Z
NVD
Status : Undergoing Analysis
Published: 2026-06-06T10:16:25.790
Modified: 2026-06-09T08:16:26.977
Link: CVE-2026-10725
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-06-09T08:30:35Z