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Fencer Vulns
high 7.5

CVE-2026-10725 json

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

published 2026-06-06 5 mo ago modified 2026-07-23 3 mo ago also EUVD-2026-34964

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

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.

Patch / fix

  • CRUX Protocol::HTTP2 1.13
  • libprotocol-http2-perl Debian 14 1.12-2

debian advisories DEBIAN-CVE-2026-10725

  • perl-Protocol-HTTP2 SLES for SAP applications 16.0, SLES 16.0 1.10-160000.3.1

suse advisories SUSE-SU-2026:22188-1

  • perl-Protocol-HTTP2 openSUSE Leap 16.0 1.10-160000.3.1
  • perl-Protocol-HTTP2 openSUSE Tumbleweed 1.130.0-1.1

opensuse advisories openSUSE-SU-2026:21125-1openSUSE-SU-2026:10988-1

  • perl-protocol-http2 Alpine 3.24, Alpine 3.23 1.14-r0

alpine advisories ALPINE-CVE-2026-10725

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-10725 updated cvss 7.5

Protocol::HTTP2: Protocol::HTTP2: Denial of Service via HTTP/2 Bomb

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • CRUX Protocol::HTTP2

Classification

Weakness
  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.