{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-16028 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-16028 is a high-severity denial of service vulnerability in perl-Protocol-HTTP2, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-16028 and fix it if it is affected.\n\nWhat it is: CVE-2026-16028 is a high-severity denial of service vulnerability in perl-Protocol-HTTP2, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-16028 in the wild and no public exploit code.\n\nAffected product: perl-Protocol-HTTP2. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-16028/ (Markdown: https://insights.sbomify.com/CVE-2026-16028/index.md)","id":"CVE-2026-16028","markdown":"https://insights.sbomify.com/CVE-2026-16028/index.md","name":"CVE-2026-16028","record":{"aliases":["DEBIAN-CVE-2026-16028","GHSA-4hff-3256-7fpc","SUSE-SU-2026:23945-1","SUSE-SU-2026:4182-1","UBUNTU-CVE-2026-16028","openSUSE-SU-2026:11735-1","openSUSE-SU-2026:21972-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl HTTP2 library","requires_auth":"none","summary":"Attackers can exhaust server memory by repeatedly opening and closing HTTP/2 streams, causing denial of service in applications using the Protocol::HTTP2 Perl module.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CPANSec","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table.\n\nWhen a stream reaches the CLOSED state, stream_state returns the concurrency slot and clears most of the stream's keys, but the entry itself stays in the connection stream table and nothing in the distribution removes it. Stream identifiers increase monotonically, so a peer can open and close streams on one connection indefinitely, each close leaving a residual entry that is retained for the life of the connection.\n\nSETTINGS_MAX_CONCURRENT_STREAMS does not bound this. That setting caps how many streams are live at once and is enforced, while the growth is made of streams the cap has already released, so it accumulates with concurrency never exceeding one. The client keeps the same table and grows the same way against a hostile server.\n\nMeasured against a server built on this module, roughly 920 bytes are retained per closed stream for about 19 bytes on the wire, so 100,000 sequential streams on one connection grow server resident memory by about 88 MiB. The streams are ordinary requests that the application accepts and completes.","ecosystems":["SUSE:Linux Enterprise Module for Package Hub 15 SP7","SUSE:Linux Enterprise Server 16.0","SUSE:Linux Enterprise Server for SAP applications 16.0","openSUSE:Leap 16.0","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Protocol::HTTP2 versions before 1.14 for Perl allow memory exhaustion via closed streams that stream_state never removes from the connection stream table.","id":"CVE-2026-16028","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":5,"n_references":3,"next":{"headline":"MStore API \u003c 4.21.0 - Unauthenticated Account Takeover via Firebase Phone Authentication","id":"CVE-2026-16030"},"packages":[{"ecosystem":"SUSE:Linux Enterprise Module for Package Hub 15 SP7","fixed":["1.10-150600.3.6.1"],"introduced":["0"],"last_affected":[],"package":"perl-Protocol-HTTP2","purl":"pkg:rpm/suse/perl-Protocol-HTTP2\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP7","source":"SUSE-SU-2026:4182-1"},{"ecosystem":"SUSE:Linux Enterprise Server 16.0","fixed":["1.10-160000.4.1"],"introduced":["0"],"last_affected":[],"package":"perl-Protocol-HTTP2","purl":"pkg:rpm/suse/perl-Protocol-HTTP2\u0026distro=SUSE%20Linux%20Enterprise%20Server%2016.0","source":"SUSE-SU-2026:23945-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","fixed":["1.10-160000.4.1"],"introduced":["0"],"last_affected":[],"package":"perl-Protocol-HTTP2","purl":"pkg:rpm/suse/perl-Protocol-HTTP2\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20applications%2016.0","source":"SUSE-SU-2026:23945-1"},{"ecosystem":"openSUSE:Leap 16.0","fixed":["1.10-160000.4.1"],"introduced":["0"],"last_affected":[],"package":"perl-Protocol-HTTP2","purl":"pkg:rpm/opensuse/perl-Protocol-HTTP2\u0026distro=openSUSE%20Leap%2016.0","source":"openSUSE-SU-2026:21972-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.140.0-1.1"],"introduced":["0"],"last_affected":[],"package":"perl-Protocol-HTTP2","purl":"pkg:rpm/opensuse/perl-Protocol-HTTP2\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11735-1"}],"prev":{"headline":"Unauthenticated WebSocket-to-XAdES SSRF in Revenue Administration's E-Signature","id":"CVE-2026-16027"},"products":[],"published":"2026-09-07","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-08","vendors":[]},"summary":"Attackers can exhaust server memory by repeatedly opening and closing HTTP/2 streams, causing denial of service in applications using the Protocol::HTTP2 Perl module.","url":"https://insights.sbomify.com/CVE-2026-16028/"}