{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-81665 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-81665 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81665 and fix it if it is affected.\n\nWhat it is: CVE-2026-81665 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-81665 in the wild and no public exploit code.\n\nAffected product: Red Hat Enterprise Linux 10. 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-2026-81665/ (Markdown: https://insights.sbomify.com/CVE-2026-81665/index.md)","id":"CVE-2026-81665","markdown":"https://insights.sbomify.com/CVE-2026-81665/index.md","name":"CVE-2026-81665","record":{"aliases":["ALSA-2026:67872","ALSA-2026:67873","ALSA-2026:69277","AZL-99888","CLSA-2026-1790008457","CLSA-2026-1790352190","DEBIAN-CVE-2026-81665","GHSA-vj89-2c25-485x","RHSA-2026:67872","RHSA-2026:67873","RHSA-2026:67878","RHSA-2026:67879","RHSA-2026:67880","RHSA-2026:67881","RHSA-2026:68574","RHSA-2026:69277","RHSA-2026:69278","RHSA-2026:69279","RHSA-2026:69280","RLSA-2026:67872","RLSA-2026:67873","RLSA-2026:69277","SUSE-SU-2026:4387-1","UBUNTU-CVE-2026-81665"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Red Hat Enterprise Linux","requires_auth":"none","summary":"A heap-based buffer overflow in Corosync allows network-adjacent attackers to crash the cluster daemon or potentially execute code via crafted multicast messages.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-122","name":"Heap-based Buffer Overflow"}],"description":"A heap-based buffer overflow was found in Corosync's Totem Process Group (totempg) message reassembly. When processing fragmented multicast messages, the buffer used to reassemble fragments lacks a runtime bounds check in release builds. A network-adjacent attacker able to send crafted multicast protocol messages to the cluster could cause a heap buffer overflow with attacker-controlled data. This can crash the Corosync daemon, causing a denial of service to the entire cluster, and may potentially allow further exploitation given sufficient heap-corruption control.","ecosystems":["AlmaLinux:10","AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:10.2","Red Hat:enterprise_linux:7::server","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::crb","Red Hat:enterprise_linux:8::highavailability","Red Hat:enterprise_linux:8::resilientstorage","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::crb","Red Hat:enterprise_linux:9::highavailability","Red Hat:enterprise_linux:9::resilientstorage","Red Hat:enterprise_linux_eus:10.0","Red Hat:rhel_aus:8.4::appstream","Red Hat:rhel_aus:8.4::highavailability","Red Hat:rhel_aus:8.6::appstream","Red Hat:rhel_e4s:8.8::appstream","Red Hat:rhel_e4s:8.8::highavailability","Red Hat:rhel_e4s:9.2::appstream","Red Hat:rhel_e4s:9.2::highavailability","Red Hat:rhel_e4s:9.2::resilientstorage","Red Hat:rhel_e4s:9.4::appstream","Red Hat:rhel_e4s:9.4::highavailability","Red Hat:rhel_e4s:9.4::resilientstorage","Red Hat:rhel_eus:9.6::appstream","Red Hat:rhel_eus:9.6::crb","Red Hat:rhel_eus:9.6::highavailability","Red Hat:rhel_eus:9.6::resilientstorage","Red Hat:rhel_eus_long_life:8.4::appstream","Red Hat:rhel_eus_long_life:8.4::highavailability","Red Hat:rhel_eus_long_life:8.4::resilientstorage","Red Hat:rhel_eus_long_life:8.6::appstream","Red Hat:rhel_eus_long_life:8.6::highavailability","Red Hat:rhel_eus_long_life:8.6::resilientstorage","Red Hat:rhel_tus:8.8::appstream","Red Hat:rhel_tus:8.8::highavailability","Rocky Linux:10","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise High Availability Extension 12 SP5","SUSE:Linux Enterprise Server 12 SP5-LTSS","SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5"],"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":"Corosync: corosync: heap-based buffer overflow in totempg assembly buffer during fragmented message reassembly","id":"CVE-2026-81665","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":255,"n_references":13,"next":{"headline":"Integer overflow in Red Hat Enterprise Linux 10","id":"CVE-2026-81666"},"packages":[{"ecosystem":"AlmaLinux:10","fixed":["3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/almalinux/corosync","source":"ALSA-2026:67872"},{"ecosystem":"AlmaLinux:10","fixed":["3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim","purl":"pkg:rpm/almalinux/corosync-vqsim","source":"ALSA-2026:67872"},{"ecosystem":"AlmaLinux:10","fixed":["3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/almalinux/corosynclib","source":"ALSA-2026:67872"},{"ecosystem":"AlmaLinux:10","fixed":["3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-devel","purl":"pkg:rpm/almalinux/corosynclib-devel","source":"ALSA-2026:67872"},{"ecosystem":"AlmaLinux:8","fixed":["3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/almalinux/corosync","source":"ALSA-2026:69277"},{"ecosystem":"AlmaLinux:8","fixed":["3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim","purl":"pkg:rpm/almalinux/corosync-vqsim","source":"ALSA-2026:69277"},{"ecosystem":"AlmaLinux:8","fixed":["3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/almalinux/corosynclib","source":"ALSA-2026:69277"},{"ecosystem":"AlmaLinux:8","fixed":["3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-devel","purl":"pkg:rpm/almalinux/corosynclib-devel","source":"ALSA-2026:69277"},{"ecosystem":"AlmaLinux:8","fixed":["3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"spausedd","purl":"pkg:rpm/almalinux/spausedd","source":"ALSA-2026:69277"},{"ecosystem":"AlmaLinux:9","fixed":["3.1.10-1.el9_8.2"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/almalinux/corosync","source":"ALSA-2026:67873"},{"ecosystem":"AlmaLinux:9","fixed":["3.1.10-1.el9_8.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim","purl":"pkg:rpm/almalinux/corosync-vqsim","source":"ALSA-2026:67873"},{"ecosystem":"AlmaLinux:9","fixed":["3.1.10-1.el9_8.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/almalinux/corosynclib","source":"ALSA-2026:67873"},{"ecosystem":"AlmaLinux:9","fixed":["3.1.10-1.el9_8.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-devel","purl":"pkg:rpm/almalinux/corosynclib-devel","source":"ALSA-2026:67873"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/redhat/corosync","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debuginfo","purl":"pkg:rpm/redhat/corosync-debuginfo","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debugsource","purl":"pkg:rpm/redhat/corosync-debugsource","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim","purl":"pkg:rpm/redhat/corosync-vqsim","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim-debuginfo","purl":"pkg:rpm/redhat/corosync-vqsim-debuginfo","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/redhat/corosynclib","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-debuginfo","purl":"pkg:rpm/redhat/corosynclib-debuginfo","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:10.2","fixed":["0:3.1.10-1.el10_2.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-devel","purl":"pkg:rpm/redhat/corosynclib-devel","source":"RHSA-2026:67872"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/redhat/corosync","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosync-debuginfo","purl":"pkg:rpm/redhat/corosync-debuginfo","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosync-qdevice","purl":"pkg:rpm/redhat/corosync-qdevice","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosync-qnetd","purl":"pkg:rpm/redhat/corosync-qnetd","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/redhat/corosynclib","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"corosynclib-devel","purl":"pkg:rpm/redhat/corosynclib-devel","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:7::server","fixed":["0:2.4.5-7.el7_9.4"],"introduced":["0"],"last_affected":[],"package":"spausedd","purl":"pkg:rpm/redhat/spausedd","source":"RHSA-2026:68574"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync","purl":"pkg:rpm/redhat/corosync","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debuginfo","purl":"pkg:rpm/redhat/corosync-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debugsource","purl":"pkg:rpm/redhat/corosync-debugsource","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim-debuginfo","purl":"pkg:rpm/redhat/corosync-vqsim-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib","purl":"pkg:rpm/redhat/corosynclib","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-debuginfo","purl":"pkg:rpm/redhat/corosynclib-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"spausedd-debuginfo","purl":"pkg:rpm/redhat/spausedd-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debuginfo","purl":"pkg:rpm/redhat/corosync-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-debugsource","purl":"pkg:rpm/redhat/corosync-debugsource","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim","purl":"pkg:rpm/redhat/corosync-vqsim","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosync-vqsim-debuginfo","purl":"pkg:rpm/redhat/corosync-vqsim-debuginfo","source":"RHSA-2026:69277"},{"ecosystem":"Red Hat:enterprise_linux:8::crb","fixed":["0:3.1.8-1.el8_10.2"],"introduced":["0"],"last_affected":[],"package":"corosynclib-debuginfo","purl":"pkg:rpm/redhat/corosynclib-debuginfo","source":"RHSA-2026:69277"}],"prev":{"headline":"OpenFaaS Gateway 0.27.11 through 0.27.13 Missing Authentication on the /system/telemetry Route","id":"CVE-2026-81664"},"products":["Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 10.0 Extended Update Support","Red Hat Enterprise Linux 7 Extended Lifecycle Support","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support","Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On","Red Hat Enterprise Linux 8.8 Telecommunications Update Service","Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions","Red Hat Enterprise Linux 9","Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions","Red Hat Enterprise Linux 9.6 Extended Update Support","Red Hat OpenShift Container Platform 4"],"published":"2026-09-04","related":[],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"total"},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Red Hat"]},"summary":"A heap-based buffer overflow in Corosync allows network-adjacent attackers to crash the cluster daemon or potentially execute code via crafted multicast messages.","url":"https://insights.sbomify.com/CVE-2026-81665/"}