CVE-2026-10725 Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb
A remote attacker can cause denial of service by sending small HTTP/2 requests that expand into large memory usage due to missing header size limits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-10725?
CVE-2026-10725 is a high-severity denial of service vulnerability in CRUX Protocol::HTTP2, published on 6 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-409
Which versions are affected by CVE-2026-10725?
It affects 1 product.
Linux distribution packages (4)
perl-Protocol-HTTP2 SUSE:Linux Enterprise Server 16.0 | All versions | 1.10-160000.3.1 |
perl-Protocol-HTTP2 SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 1.10-160000.3.1 |
perl-Protocol-HTTP2 openSUSE:Leap 16.0 | All versions | 1.10-160000.3.1 |
perl-Protocol-HTTP2 openSUSE:Tumbleweed | All versions | 1.130.0-1.1 |
Products include Crux Protocol\.
How do I fix CVE-2026-10725?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-10725 being exploited?
There is no known exploitation of CVE-2026-10725 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-10725, GHSA-q432-rmqv-hh8m, SUSE-SU-2026:22188-1, SUSE-SU-2026:2306-1, UBUNTU-CVE-2026-10725, openSUSE-SU-2026:10988-1 and 1 more.