{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-122127 in the wild and no public exploit code.","exposure":"","fix":"Upgrade to a fixed version.","what":"CVE-2026-122127 is a high-severity vulnerability in CESNET ipfixcol2, published on 4 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-122127 and fix it if it is affected.\n\nWhat it is: CVE-2026-122127 is a high-severity vulnerability in CESNET ipfixcol2, published on 4 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-122127 in the wild and no public exploit code.\n\nAffected product: CESNET ipfixcol2. 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-2026-122127/ (Markdown: https://insights.sbomify.com/CVE-2026-122127/index.md)","id":"CVE-2026-122127","markdown":"https://insights.sbomify.com/CVE-2026-122127/index.md","name":"CVE-2026-122127","record":{"aliases":["DEBIAN-CVE-2026-122127","GHSA-4575-chq4-crfc","UBUNTU-CVE-2026-122127"],"analysis":null,"analysis_generated_by":null,"assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.","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":"CESNET ipfixcol2 2.7.1 before 2.9.0 Heap Buffer Overflow via TCP LZ4 Decoder","id":"CVE-2026-122127","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":null,"year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"CESNET ipfixcol2 2.7.1 before 2.9.0 Memory Exhaustion via TCP LZ4 Decoder","id":"CVE-2026-122129"},"nickname":null,"packages":[],"prev":{"headline":"reSIProcate reTurn client through 1.14.0 Heap Buffer Overflow via TurnTcpSocket","id":"CVE-2026-122126"},"products":["ipfixcol2"],"published":"2026-11-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-11-05","vendors":["CESNET"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-122127/"}