{"answers":{"affected":"3 open source packages ship an affected version, including github.com/rabbitmq/amqp091-go.","exploited":"There is no known exploitation of CVE-2026-77403 in the wild and no public exploit code.","fix":"Upgrade github.com/rabbitmq/amqp091-go to 1.13.0 or later.","what":"CVE-2026-77403 is a high-severity denial of service vulnerability in rabbitmq amqp091-go, published on 16 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-2026-77403 and fix it if it is affected.\n\nWhat it is: CVE-2026-77403 is a high-severity denial of service vulnerability in rabbitmq amqp091-go, published on 16 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-2026-77403 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/rabbitmq/amqp091-go (Go): affected all versions; fixed in 1.13.0\n- github.com/rabbitmq/amqp091-go (Go): affected all versions; fixed in 1.13.0\n- github.com/rabbitmq/amqp091-go (Go): affected all versions; fixed in 1.13.0\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-2026-77403/ (Markdown: https://insights.sbomify.com/CVE-2026-77403/index.md)","id":"CVE-2026-77403","markdown":"https://insights.sbomify.com/CVE-2026-77403/index.md","name":"CVE-2026-77403","record":{"aliases":["AZL-103209","AZL-103296","CLEANSTART-2026-OK83858","CLEANSTART-2026-QD76067","CLEANSTART-2026-TG71483","DEBIAN-CVE-2026-77403","ECHO-4c9a-de8f-1909","GHSA-xwwf-m8fg-p9q2","GO-2026-6503","MINI-2jx4-78rm-r4qh","MINI-3xqg-qj5c-2rp8","MINI-53fg-69w4-hm2f","MINI-53hf-6crc-ghm3","MINI-5p7r-wv3f-5mpv","MINI-6474-429m-r943","MINI-694m-83h4-7f4p","MINI-7rg3-3w7j-cww3","MINI-89w8-mr88-j33g","MINI-8gmq-q72v-5gxf","MINI-947v-6q75-7v9g","MINI-97x6-422c-7jpf","MINI-c5r2-3mww-6pxg","MINI-c9f3-73g8-v89g","MINI-cp2r-fqjr-2wqq","MINI-f4w6-m662-29w7","MINI-fh54-7rqx-5vm3","MINI-g4f5-9jq2-qv69","MINI-h962-cw5q-32gx","MINI-jh6m-5w4w-r734","MINI-jj62-x36j-883p","MINI-m276-7mcj-mhgp","MINI-m287-ccmf-6h53","MINI-m93c-p9cf-r7fg","MINI-qqgq-9f3g-64h2","MINI-r262-wppx-wqc2","MINI-r39w-6qjq-2vf9","MINI-r9jh-6wh5-jhq6","MINI-rfgv-4mhv-c5gw","MINI-rxhr-5263-2jvm","MINI-v8mh-5j8m-cm2p","MINI-vgx6-mh5f-2925","MINI-w3wj-5r64-4cwg","MINI-wc46-fcr6-jwgf","MINI-x4vm-7fgv-vjf2","MINI-xccg-q92h-gwwc","ROOT-APP-GOBINARY-CVE-2026-77403","UBUNTU-CVE-2026-77403"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go AMQP client library","requires_auth":"none","summary":"A malicious AMQP broker can cause a Go client to stall by advertising an invalidly small frame size, leading to resource exhaustion.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.9,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H","version":"4.0"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"}],"description":"RabbitMQ amqp091-go is a Go AMQP 0.9.1 client. Prior to 1.13.0, Connection.openTune in connection.go accepts a server-advertised FrameMax below the AMQP frameMinSize value of 4096 bytes because the connection negotiation loop does not enforce the protocol minimum. A malicious or compromised AMQP broker can therefore advertise an extremely small FrameMax, causing later client publications to be fragmented into excessive numbers of frames and write operations. This can consume CPU and stall the client or its host. This issue is fixed in version 1.13.0.","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":"RabbitMQ amqp091-go: Denial of Service via Sub-Spec Frame Size Negotiation","id":"CVE-2026-77403","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"RabbitMQ amqp091-go: Connection Configuration Overwrite via Unsanitized TLS Path Parameter Injection","id":"CVE-2026-77404"},"packages":[{"ecosystem":"Go","fixed":["1.13.0"],"introduced":["0"],"last_affected":[],"package":"github.com/rabbitmq/amqp091-go","purl":null,"source":"GHSA-xwwf-m8fg-p9q2"},{"ecosystem":"Go","fixed":["1.13.0"],"introduced":["0"],"last_affected":[],"package":"github.com/rabbitmq/amqp091-go","purl":"pkg:golang/github.com/rabbitmq/amqp091-go","source":"GHSA-xwwf-m8fg-p9q2"},{"ecosystem":"Go","fixed":["1.13.0"],"introduced":["0"],"last_affected":[],"package":"github.com/rabbitmq/amqp091-go","purl":"pkg:golang/github.com/rabbitmq/amqp091-go","source":"GO-2026-6503"}],"prev":{"headline":"Zope AccessControl: Information disclosure through Python string `format` and `format_map` functions","id":"CVE-2026-77401"},"products":["amqp091-go"],"published":"2026-09-16","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":"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":"2026-09-16","vendors":["rabbitmq"]},"summary":"A malicious AMQP broker can cause a Go client to stall by advertising an invalidly small frame size, leading to resource exhaustion.","url":"https://insights.sbomify.com/CVE-2026-77403/"}