CVE-2026-10725

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

cpe:2.3:a:crux:protocol\:\:http2:*:*:*:*:*:perl:*:*

History

No history.

Information

Published : 2026-06-06 10:16

Updated : 2026-07-23 07:10

NVD link : CVE-2026-10725

Mitre link : CVE-2026-10725

CVE.ORG link : CVE-2026-10725

JSON object : View

Products Affected

crux

protocol\

CWE

CWE-409

Improper Handling of Highly Compressed Data (Data Amplification)

{"id": "CVE-2026-10725", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10725", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-08T18:12:28.230486Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "affectedData": [{"repo": "https://github.com/vlet/p5-Protocol-HTTP2", "vendor": "CRUX", "product": "Protocol::HTTP2", "versions": [{"status": "affected", "version": "0", "lessThan": "1.13", "versionType": "custom"}], "packageName": "Protocol-HTTP2", "collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "programRoutines": [{"name": "Protocol::HTTP2::HeaderCompression::headers_decode"}, {"name": "Protocol::HTTP2::Stream::stream_header_block_add"}]}]}], "published": "2026-06-06T10:16:25.790", "references": [{"url": "https://github.com/vlet/p5-Protocol-HTTP2/commit/822bf22224adbd662e8d0b865eeacb2b294d16cd.patch", "tags": ["Patch"], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/HeaderCompression.pm#L133", "tags": ["Product"], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/Stream.pm#L414", "tags": ["Product"], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://metacpan.org/release/CRUX/Protocol-HTTP2-1.13/changes", "tags": ["Release Notes"], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "https://security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r2.patch", "tags": ["Patch"], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}, {"url": "http://www.openwall.com/lists/oss-security/2026/06/06/7", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "description": [{"lang": "en", "value": "CWE-409"}]}], "descriptions": [{"lang": "en", "value": "Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb.\n\nProtocol::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\").\n\nThe 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.\n\nMAX_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."}, {"lang": "es", "value": "Las versiones de Protocol::HTTP2 anteriores a la 1.13 para Perl son vulnerables a una bomba HTTP/2.\n\nLa ruta HPACK de entrada de Protocol::HTTP2 no tiene l\u00edmite de tama\u00f1o para la lista de encabezados, por lo que una peque\u00f1a solicitud HTTP/2 puede expandirse en una gran cantidad de memoria del servidor (la 'bomba HTTP/2').\n\nEl m\u00e9todo headers_decode materializa una copia completa de clave+valor por referencia indexada sin una verificaci\u00f3n de tama\u00f1o en ejecuci\u00f3n, y el m\u00e9todo stream_header_block_add a\u00f1ade (desde la versi\u00f3n 1.12) cada trama CONTINUATION al b\u00fafer por flujo sin l\u00edmites.\n\nMAX_HEADER_LIST_SIZE (valor predeterminado 65536) se anuncia en SETTINGS pero nunca se consulta durante la decodificaci\u00f3n. Est\u00e1 ausente del decodificador y de la etiqueta de exportaci\u00f3n :limits."}], "lastModified": "2026-07-23T07:10:00.113", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:crux:protocol\\:\\:http2:*:*:*:*:*:perl:*:*", "vulnerable": true, "matchCriteriaId": "61F9FFF8-0FE0-4D08-B0ED-13735781D313", "versionEndExcluding": "1.13"}], "operator": "OR"}]}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}