{"answers":{"affected":"2 open source packages ship an affected version, including buffa.","exploited":"There is no known exploitation of CVE-2026-55407 in the wild and no public exploit code.","fix":"Upgrade buffa to 0.8.0 or later.","what":"CVE-2026-55407 is a medium-severity denial of service vulnerability in anthropics buffa, published on 16 Jul 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-2026-55407 and fix it if it is affected.\n\nWhat it is: CVE-2026-55407 is a medium-severity denial of service vulnerability in anthropics buffa, published on 16 Jul 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-2026-55407 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- buffa (crates.io): affected all versions; fixed in 0.8.0\n- buffa (crates.io): affected all versions; fixed in 0.8.0\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-2026-55407/ (Markdown: https://insights.sbomify.com/CVE-2026-55407/index.md)","id":"CVE-2026-55407","markdown":"https://insights.sbomify.com/CVE-2026-55407/index.md","name":"CVE-2026-55407","record":{"aliases":["GHSA-f9qc-qg88-7pq5"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Rust protobuf library","requires_auth":"none","summary":"An unauthenticated attacker can crash a process using the Buffa Rust library by sending a small, crafted protobuf payload that causes excessive memory allocation.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value"},{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.8.0, the decode_unknown_field function in buffa's protobuf decoder allocated heap memory in proportion to untrusted input (unknown fields in the serialized protobuf) without enforcing an allocation budget, affecting any message decoded from untrusted input using code generated with preserve_unknown_fields=true (the default); a small, well-formed payload of nested unknown fields inside a StartGroup could trigger roughly 22x memory amplification (for example a 64 MiB input forcing about 1.4 GB of heap allocation), and length-delimited unknown fields could be sized arbitrarily, so an unauthenticated attacker could crash a process through memory exhaustion because the top-level message size cap did not account for in-decode amplification. This issue is fixed in version 0.8.0.","ecosystems":["crates.io"],"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":"Buffa: Memory Exhaustion Denial of Service in decode_unknown_field via Unbounded Allocation","id":"CVE-2026-55407","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":2,"n_references":4,"next":{"headline":"Koodo Reader: Remote code execution via malicious epub file","id":"CVE-2026-55408"},"packages":[{"ecosystem":"crates.io","fixed":["0.8.0"],"introduced":["0"],"last_affected":[],"package":"buffa","purl":null,"source":"GHSA-f9qc-qg88-7pq5"},{"ecosystem":"crates.io","fixed":["0.8.0"],"introduced":["0"],"last_affected":[],"package":"buffa","purl":"pkg:cargo/buffa","source":"GHSA-f9qc-qg88-7pq5"}],"prev":{"headline":"Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref","id":"CVE-2026-55406"},"products":["buffa"],"published":"2026-07-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-16","vendors":["anthropics"]},"summary":"An unauthenticated attacker can crash a process using the Buffa Rust library by sending a small, crafted protobuf payload that causes excessive memory allocation.","url":"https://insights.sbomify.com/CVE-2026-55407/"}