CVE-2026-10725
Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb
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.
- Record
CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-409
- Updated
- 2026-11-02
EUVDEUVD-2026-34964
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.
- Record
EUVD-2026-34964- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-q432-rmqv-hh8m
Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb. Protocol::HTTP2's...
Protocol::HTTP2 versions through 1.12 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.
- Record
GHSA-q432-rmqv-hh8m- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-409
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-409
- Updated
- 2026-11-02
OSVALPINE-CVE-2026-10725
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.
- Record
ALPINE-CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
OSV
Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb
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.
- Record
CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-409
- Updated
- 2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2026-10725
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.
- Record
DEBIAN-CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-10725
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.
- Record
UBUNTU-CVE-2026-10725- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVopenSUSE-SU-2026:10988-1 No score
perl-Protocol-HTTP2-1.130.0-1.1 on GA media
These are all security issues fixed in the perl-Protocol-HTTP2-1.130.0-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2026:10988-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2026:21125-1 No score
Security update for perl-Protocol-HTTP2
This update for perl-Protocol-HTTP2 fixes the following issue
- CVE-2026-10725: denial of service due to absence of inbound HPACK header-list size limit (bsc#1267857).
- Record
openSUSE-SU-2026:21125-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:22188-1 No score
Security update for perl-Protocol-HTTP2
This update for perl-Protocol-HTTP2 fixes the following issue
- CVE-2026-10725: denial of service due to absence of inbound HPACK header-list size limit (bsc#1267857).
- Record
SUSE-SU-2026:22188-1- Updated
- 2026-11-02
OSVSUSE-SU-2026:2306-1 No score
Security update for perl-Protocol-HTTP2
This update for perl-Protocol-HTTP2 fixes the following issue
- CVE-2026-10725: denial of service due to absence of inbound HPACK header-list size limit (HTTP/2 Bomb attack) (bsc#1267857).
- Record
SUSE-SU-2026:2306-1- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
perl-protocol-http2Alpine:v3.23 |
before 1.14-r0 | 1.14-r0 |
perl-protocol-http2Alpine:v3.24 |
before 1.14-r0 | 1.14-r0 |
libprotocol-http2-perlDebian:12 |
All versions, plus listed versions 1.10-21.10-31.11-11.12-11.12-21.13-11.14-1 |
None known |
libprotocol-http2-perlDebian:13 |
All versions, plus listed versions 1.11-11.12-11.12-21.13-11.14-1 |
None known |
libprotocol-http2-perlDebian:14 |
before 1.12-2, plus listed versions 1.11-11.12-1 |
1.12-2 |
perl-Protocol-HTTP2SUSE:Linux Enterprise Server 16.0 |
before 1.10-160000.3.1 | 1.10-160000.3.1 |
perl-Protocol-HTTP2SUSE:Linux Enterprise Server for SAP applications 16.0 |
before 1.10-160000.3.1 | 1.10-160000.3.1 |
libprotocol-http2-perlUbuntu:18.04:LTS |
All versions, plus listed versions 1.08-1 |
None known |
libprotocol-http2-perlUbuntu:20.04:LTS |
All versions, plus listed versions 1.09-11.10-1 |
None known |
libprotocol-http2-perlUbuntu:22.04:LTS |
All versions, plus listed versions 1.10-1 |
None known |
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| Package | Affected | Fixed |
|---|---|---|
libprotocol-http2-perlUbuntu:24.04:LTS |
All versions, plus listed versions 1.10-3 |
None known |
libprotocol-http2-perlUbuntu:25.10 |
All versions, plus listed versions 1.11-1 |
None known |
libprotocol-http2-perlUbuntu:26.04:LTS |
All versions, plus listed versions 1.11-1 |
None known |
perl-Protocol-HTTP2openSUSE:Tumbleweed |
before 1.130.0-1.1 | 1.130.0-1.1 |
perl-Protocol-HTTP2openSUSE:Leap 16.0 |
before 1.10-160000.3.1 | 1.10-160000.3.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-10725 is a high vulnerability (CVSS 7.5) in Crux Protocol::http2, published June 6, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.41%, the 35th percentile. Fixed in perl-protocol-http2 1.14-r0.
References
metacpan.org/release/CRUX/Protocol-HTTP2-1.13/changes
github.com/vlet/p5-Protocol-HTTP2/commit/822bf22224adbd662e8d0b865eeacb2b294d16cd.patch
security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r2.patch
openwall.com/lists/oss-security/2026/06/06/7
Show 15 moreShow less
nvd.nist.gov/vuln/detail/CVE-2026-10725
security.alpinelinux.org/vuln/CVE-2026-10725
cpan.org/modules
security-tracker.debian.org/tracker/CVE-2026-10725
suse.com/support/update/announcement/2026/suse-su-202622188-1
bugzilla.suse.com/1267857
ubuntu.com/security/CVE-2026-10725
cve.org/CVERecord?id=CVE-2026-10725
lists.security.metacpan.org/cve-announce/msg/40751319