CRUX Protocol::HTTP/2 up to 1.12 on Perl headers_decode HTTP/2 Bomb data amplification

Summaryinfo

A vulnerability labeled as problematic has been found in CRUX Protocol::HTTP2 up to 1.12 on Perl. This vulnerability affects the function headers_decode. Executing a manipulation can lead to data amplification. The identification of this vulnerability is CVE-2026-10725. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in CRUX Protocol::HTTP2 up to 1.12 on Perl. This vulnerability affects the function headers_decode. The manipulation with an unknown input leads to a data amplification vulnerability. The CWE definition for the vulnerability is CWE-409. The product does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at metacpan.org. This vulnerability was named CVE-2026-10725 since 06/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 319610 (Linux Distros Unpatched Vulnerability : CVE-2026-10725), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (319610) and EUVD (EUVD-2026-34964). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• CRUX

Name

• Protocol::HTTP2

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion