Read the docs
TI-2026-09222 Aliases CVE-2026-10725GHSA-q432-rmqv-hh8m

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

Priority LOW 39CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00414 35th percentileScored 2026-11-07
Fix Fixed Protocol::HTTP2 (CRUX): 1.13

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CRUXProtocol::HTTP2before 1.131.13Patch availableCNA
  • Protocol::HTTP2 VendorCRUX Affected before 1.13 Fixed in 1.13 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:crux:protocol\:\:http2:*:*:*:*:*:perl:*:* http2VulnerableCRUX
  • cpe:2.3:a:crux:protocol\:\:http2:*:*:*:*:*:perl:*:* Versions http2 Vulnerable ·CRUX

Remediation

  • Fix · CNA Protocol::HTTP2 (CRUX) Fixed in 1.13

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-10725
  2. 2026-10-03 Alias added: GHSA-q432-rmqv-hh8m

References

Patch 2

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences