{"answers":{"affected":"3 open source packages ship an affected version, including github.com/osrg/gobgp/v4.","exploited":"There is no known exploitation of CVE-2026-49838 in the wild and no public exploit code.","fix":"Upgrade github.com/osrg/gobgp/v4 to 4.7.0 or later.","what":"CVE-2026-49838 is a medium-severity vulnerability in osrg gobgp, published on 10 Sep 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-2026-49838 and fix it if it is affected.\n\nWhat it is: CVE-2026-49838 is a medium-severity vulnerability in osrg gobgp, published on 10 Sep 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-2026-49838 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.7.0\n- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.7.0\n- github.com/osrg/gobgp/v4 (Go): affected all versions; fixed in 4.7.0\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-2026-49838/ (Markdown: https://insights.sbomify.com/CVE-2026-49838/index.md)","id":"CVE-2026-49838","markdown":"https://insights.sbomify.com/CVE-2026-49838/index.md","name":"CVE-2026-49838","record":{"aliases":["CLEANSTART-2026-HU02561","DEBIAN-CVE-2026-49838","GHSA-frrj-87jh-2772","GO-2026-5954","MINI-5wcc-p7h9-hf6p","MINI-7qjr-jr38-pfhc","UBUNTU-CVE-2026-49838"],"analysis":{"component_type":"network_device","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"BGP routing software","requires_auth":"none","summary":"A remote attacker with a configured confederation eBGP peer can cause a denial of service by sending a malformed BGP UPDATE with an empty AS_PATH.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-129","name":"Improper Validation of Array Index"}],"description":"GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked `p.Value[0]` access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 patches the issue.","ecosystems":["Go"],"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":"GoBGP confederation validation panics on empty AS_PATH attribute","id":"CVE-2026-49838","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"jq --rawfile invalid-state reuse after String too long causes heap-buffer-overflow","id":"CVE-2026-49839"},"packages":[{"ecosystem":"Go","fixed":["4.7.0"],"introduced":["0"],"last_affected":[],"package":"github.com/osrg/gobgp/v4","purl":null,"source":"GHSA-frrj-87jh-2772"},{"ecosystem":"Go","fixed":["4.7.0"],"introduced":["0"],"last_affected":[],"package":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","source":"GHSA-frrj-87jh-2772"},{"ecosystem":"Go","fixed":["4.7.0"],"introduced":["0"],"last_affected":[],"package":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","source":"GO-2026-5954"}],"prev":{"headline":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries","id":"CVE-2026-49837"},"products":["gobgp"],"published":"2026-09-10","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2026-09-11","vendors":["osrg"]},"summary":"A remote attacker with a configured confederation eBGP peer can cause a denial of service by sending a malformed BGP UPDATE with an empty AS_PATH.","url":"https://insights.sbomify.com/CVE-2026-49838/"}