{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-40198 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-40198 is a high-severity vulnerability in STIGTSP Net::CIDR::Lite, published on 10 Apr 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-2026-40198 and fix it if it is affected.\n\nWhat it is: CVE-2026-40198 is a high-severity vulnerability in STIGTSP Net::CIDR::Lite, published on 10 Apr 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-2026-40198 in the wild and no public exploit code.\n\nAffected product: STIGTSP Net::CIDR::Lite. 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-2026-40198/ (Markdown: https://insights.sbomify.com/CVE-2026-40198/index.md)","id":"CVE-2026-40198","markdown":"https://insights.sbomify.com/CVE-2026-40198/index.md","name":"CVE-2026-40198","record":{"aliases":["ALPINE-CVE-2026-40198","AZL-82739","DEBIAN-CVE-2026-40198","GHSA-c25q-mqx5-m6v8","UBUNTU-CVE-2026-40198"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl IP CIDR library","requires_auth":"none","summary":"Attackers can bypass IP-based access controls by providing malformed IPv6 addresses that cause incorrect range matching in the Net::CIDR::Lite Perl library.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CPANSec","cpe":[{"product":"net\\","vendor":"stigtsp"}],"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:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-1286","name":"Improper Validation of Syntactic Correctness of Input"}],"description":"Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass.\n\n_pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like \"abcd\", \"1:2:3\", or \"1:2:3:4:5:6:7\" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17).\n\nThe packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range.\n\nExample:\n\n  my $cidr = Net::CIDR::Lite-\u003enew(\"::/8\");\n  $cidr-\u003efind(\"1:2:3\");  # invalid input, incorrectly returns true\n\nThis is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module.\n\nSee also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses.","ecosystems":[],"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":"Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass","id":"CVE-2026-40198","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses, which may allow IP ACL bypass","id":"CVE-2026-40199"},"packages":[],"prev":{"headline":"Incus nil-pointer dereference in custom volume import allows denial of service","id":"CVE-2026-40197"},"products":["Net::CIDR::Lite"],"published":"2026-04-10","related":[{"cvss_score":6.5,"headline":"Net::CIDR::Lite versions before 0.23 for Perl mishandles IPv4 mapped IPv6 addresses, which may allow IP ACL bypass","id":"CVE-2026-40199","kev_date_added":null,"published":"2026-04-10"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"2026-04-13","vendors":["STIGTSP"]},"summary":"Attackers can bypass IP-based access controls by providing malformed IPv6 addresses that cause incorrect range matching in the Net::CIDR::Lite Perl library.","url":"https://insights.sbomify.com/CVE-2026-40198/"}