{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-48686 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-48686 is a critical memory corruption vulnerability in n/a, published on 26 May 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-2026-48686 and fix it if it is affected.\n\nWhat it is: CVE-2026-48686 is a critical memory corruption vulnerability in n/a, published on 26 May 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-2026-48686 in the wild and no public exploit code.\n\nAffected product: n/a. 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-2026-48686/ (Markdown: https://insights.sbomify.com/CVE-2026-48686/index.md)","id":"CVE-2026-48686","markdown":"https://insights.sbomify.com/CVE-2026-48686/index.md","name":"CVE-2026-48686","record":{"aliases":["DEBIAN-CVE-2026-48686","GHSA-7p7c-c3vp-p386","UBUNTU-CVE-2026-48686"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Network monitoring software","requires_auth":"none","summary":"A stack-based buffer overflow in FastNetMon's BGP decoder allows remote attackers to execute arbitrary code via malformed packets.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fastnetmon","vendor":"pavel-odintsov"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"description":"FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Layer Reachability Information) decoder. The function decode_bgp_subnet_encoding_ipv4_raw() in src/bgp_protocol.cpp reads prefix_bit_length directly from the BGP packet (line 99) without validating it is \u003c= 32 for IPv4 prefixes. This value is passed to how_much_bytes_we_need_for_storing_certain_subnet_mask() which computes ceil(prefix_bit_length / 8), returning up to 32 bytes for a prefix_bit_length of 255. The result is used as the length argument to memcpy() (line 106), which copies into a 4-byte uint32_t stack variable (prefix_ipv4). This causes a stack buffer overflow of up to 28 bytes, which can be exploited for arbitrary code execution. Additionally, the unvalidated prefix_bit_length is passed to convert_cidr_to_binary_netmask_local_function_copy() (line 111), where a shift of (32 - cidr) with cidr \u003e 32 causes undefined behavior.","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":"Memory corruption in n/a","id":"CVE-2026-48686","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Command injection in n/a","id":"CVE-2026-48687"},"packages":[],"prev":{"headline":"Memory corruption in n/a","id":"CVE-2026-48685"},"products":["n/a"],"published":"2026-05-26","related":[{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2026-48689","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":8.1,"headline":"Command injection in n/a","id":"CVE-2026-48687","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":8.1,"headline":"Missing authorization in n/a","id":"CVE-2026-48692","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":8.1,"headline":"Command injection in n/a","id":"CVE-2026-48694","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":8.1,"headline":"Command injection in n/a","id":"CVE-2026-48695","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":7.5,"headline":"Memory corruption in n/a","id":"CVE-2026-48688","kev_date_added":null,"published":"2026-05-26"}],"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":"total"},"state":"PUBLISHED","updated":"2026-05-26","vendors":["n/a"]},"summary":"A stack-based buffer overflow in FastNetMon's BGP decoder allows remote attackers to execute arbitrary code via malformed packets.","url":"https://insights.sbomify.com/CVE-2026-48686/"}