Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Crux | Protocol\ | < 1.13, \ |
Related Weaknesses (CWE)
References
- https://github.com/vlet/p5-Protocol-HTTP2/commit/822bf22224adbd662e8d0b865eeacb2Patch
- https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/Product
- https://metacpan.org/release/CRUX/Protocol-HTTP2-1.12/source/lib/Protocol/HTTP2/Product
- https://metacpan.org/release/CRUX/Protocol-HTTP2-1.13/changesRelease Notes
- https://security.metacpan.org/patches/P/Protocol-HTTP2/1.12/CVE-2026-10725-r2.paPatch
- http://www.openwall.com/lists/oss-security/2026/06/06/7Mailing ListThird Party Advisory
FAQ
What is CVE-2026-10725?
CVE-2026-10725 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 serve...
How severe is CVE-2026-10725?
CVE-2026-10725 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-10725?
Check the references section above for vendor advisories and patch information. Affected products include: Crux Protocol\.