CVE-2026-10725: Protocol::HTTP2 versions before 1.13 for Perl is vulnerable to a HTTP/2 Bomb. Protocol::HTTP2's inbound HPACK

Q: How do I fix CVE-2026-10725?

protocol\: upgrade to 1.13. Exact commands for each OS are on this page.

Q: Is CVE-2026-10725 being exploited?

CVE-2026-10725 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-10725 affect?

CVE-2026-10725 affects protocol\. Severity is high (CVSS 7.5). 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 heade

Q: How urgent is CVE-2026-10725?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-10725 is a high-severity flaw (CVSS 7.5) affecting protocol\. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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-stre

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-409
Published	2026-06-06
Last modified	2026-07-23

Publisher (CNA): CPANSec · Vendor: crux

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-06 10:16 UTCPublished CVE record published
2026-07-23 07:10 UTCUpdated Record last modified

crux protocol\ UPGRADE

Affected: < 1.13

Fixed in: 1.13

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy protocol || rpm -q protocol || protocol --version

2. UPGRADE to 1.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade protocol

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade protocol

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-10725?

protocol\: upgrade to 1.13. Exact commands for each OS are on this page.

Is CVE-2026-10725 being exploited?

CVE-2026-10725 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-10725 affect?

CVE-2026-10725 affects protocol\. Severity is high (CVSS 7.5). 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 heade

How urgent is CVE-2026-10725?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Software pages

Perl vulnerabilities

References

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