{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-65653 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-65653 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-65653 is a high-severity denial of service vulnerability in temporalio/tchannel-go, published on 21 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-2026-65653 and fix it if it is affected.\n\nWhat it is: CVE-2026-65653 is a high-severity denial of service vulnerability in temporalio/tchannel-go, published on 21 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-2026-65653 in the wild and no public exploit code.\n\nAffected product: temporalio/tchannel-go. 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-2026-65653/ (Markdown: https://insights.sbomify.com/CVE-2026-65653/index.md)","id":"CVE-2026-65653","markdown":"https://insights.sbomify.com/CVE-2026-65653/index.md","name":"CVE-2026-65653","record":{"aliases":["GHSA-vg3p-fxfm-m684"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Go TChannel library","requires_auth":"none","summary":"Remote attackers can crash applications using the tchannel-go library by sending malformed call fragments, causing a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Temporal","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-129","name":"Improper Validation of Array Index"}],"description":"github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks. The fragment reader left its chunk slice empty and then unconditionally selected the first element. A network peer can supply such a malformed call fragment, including as a direct initial call request after completing the standard initialization handshake. On that inbound path, the resulting unrecovered Go slice-bounds panic occurs on a library-created dispatch goroutine and terminates the hosting process. This allows remote denial of service against applications that expose the listener to untrusted peers. The impact is limited to availability; no confidentiality or integrity impact was identified.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":false,"headline":"temporalio/tchannel-go zero-chunk call fragment causes process termination","id":"CVE-2026-65653","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossip","id":"CVE-2026-65654"},"packages":[],"prev":{"headline":"temporalio/tchannel-go malformed checksum type causes process termination","id":"CVE-2026-65652"},"products":["temporalio/tchannel-go"],"published":"2026-09-21","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":"2026-09-21","vendors":["Temporal Technologies, Inc."]},"summary":"Remote attackers can crash applications using the tchannel-go library by sending malformed call fragments, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2026-65653/"}