JLSEC-2026-20 | Vulnetix

JLSEC-2026-20 PUBLISHED CVSS 7.5 HIGH

Record from OSV · Published April 1, 2026

Hyperium Hyper before 0.14.19 does not allow for customization of the `max_header_list_size` method in the H2 third-party software, allowing attackers to perform HTTP2 attacks.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

Package	Ecosystem	Fixed in
hyper_jll	pkg.julialang.org	0.14.19+0
hyper_jll	juliahub.com	0.14.19+0

Risk scores

CVSS 3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Vendor	Product	Versions
Julia	hyper_jll	0
Julia	hyper_jll	0

Timeline

Apr 1, 2026 CVE Published
Jul 25, 2026 CVE Updated

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln JLSEC-2026-20
vulnetix vdb fixes JLSEC-2026-20

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curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/JLSEC-2026-20/fixes/registry"

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References

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