{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-19566 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-19566 is a high-severity denial of service vulnerability in RRWO Net::CIDR::Set, published on 12 Aug 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-2026-19566 and fix it if it is affected.\n\nWhat it is: CVE-2026-19566 is a high-severity denial of service vulnerability in RRWO Net::CIDR::Set, published on 12 Aug 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-2026-19566 in the wild and no public exploit code.\n\nAffected product: RRWO Net::CIDR::Set. 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-2026-19566/ (Markdown: https://insights.sbomify.com/CVE-2026-19566/index.md)","id":"CVE-2026-19566","markdown":"https://insights.sbomify.com/CVE-2026-19566/index.md","name":"CVE-2026-19566","record":{"aliases":["DEBIAN-CVE-2026-19566","GHSA-grjr-r4x5-mx4p","UBUNTU-CVE-2026-19566","openSUSE-SU-2026:11550-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl CIDR library","requires_auth":"none","summary":"Attackers can cause memory exhaustion or corrupt CIDR sets by supplying unbounded IPv6 prefix lengths to Net::CIDR::Set functions.","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-789","name":"Memory Allocation with Excessive Size Value"},{"id":"CWE-1284","name":"Improper Validation of Specified Quantity in Input"}],"description":"Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set ranges via unbounded IPv6 prefix lengths.\n\nThe _encode method accepts any prefix length matching `(0|[1-9][0-9]*)` and passes it to _width2bits(), which builds the mask as `'1' x ($width + 8)`, one character per bit. The _inc() method then unpacks the packed mask into a Perl array of one scalar per byte, so the prefix length alone sets the allocation size: `::/100000000` builds a 100 MB string and a 12.5 million element array. The value being tested is parsed, not just the configured ranges: contains() builds a set from its argument, and _guess_coder() tries the IPv4 coder and then the IPv6 coder, so an IPv4-only set expands an oversized IPv6 prefix length before the mixed address width check rejects it.\n\nAny caller that passes untrusted input to contains() or add() can exhaust process memory. A prefix length above 128 is also stored as a range that does not match the requested block: 2001:db8::/129 stringifies back unchanged, contains() of its own base address returns false, and removing it from a set drops the base address while the set still prints as covering it.","ecosystems":["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":"Denial of service in Net::CIDR::Set","id":"CVE-2026-19566","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":1,"n_references":4,"next":{"headline":"SVG File Parsing Memory Corruption Vulnerability in Autodesk 3ds Max","id":"CVE-2026-19568"},"packages":[{"ecosystem":"openSUSE:Tumbleweed","fixed":["0.230.0-1.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-CIDR-Set","purl":"pkg:rpm/opensuse/perl-Net-CIDR-Set\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11550-1"}],"prev":{"headline":"Apache::AppSamurai::Util versions through 1.01 for Perl generate predictable session authentication keys from the clock and process id in CreateSessionAuthKey.","id":"CVE-2026-19565"},"products":["Net::CIDR::Set"],"published":"2026-08-12","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":"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":"2026-08-12","vendors":["RRWO"]},"summary":"Attackers can cause memory exhaustion or corrupt CIDR sets by supplying unbounded IPv6 prefix lengths to Net::CIDR::Set functions.","url":"https://insights.sbomify.com/CVE-2026-19566/"}