# CVE-2026-10725: libprotocol-http2-perl: Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb

CVE-2026-10725 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:22188-1, released June 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-10725
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0041
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 6, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libprotocol-http2-perl Debian 14 | 1.12-2 | [DEBIAN-CVE-2026-10725](https://patchblox.com/security/data/fix/linux/debian-cve-2026-10725.md) | Jun 24, 2026 |
| Linux | perl-Protocol-HTTP2 opensuse-leap 16.0 | 1.10-160000.3.1 | [OPENSUSE-SU-2026:21125-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21125-1.md) | Jun 20, 2026 |
| Linux | perl-Protocol-HTTP2 sles 16.0 | 1.10-160000.3.1 | [SUSE-SU-2026:22188-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-22188-1.md) | Jun 20, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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