{"answers":{"affected":"It affects 3 products.","exploited":"There is no known exploitation of CVE-2026-59843 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-59843 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-59843 and fix it if it is affected.\n\nWhat it is: CVE-2026-59843 is a medium-severity denial of service vulnerability in Redhat Enterprise Linux, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-59843 in the wild and no public exploit code.\n\nAffected product: Redhat Enterprise Linux. 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-2026-59843/ (Markdown: https://insights.sbomify.com/CVE-2026-59843/index.md)","id":"CVE-2026-59843","markdown":"https://insights.sbomify.com/CVE-2026-59843/index.md","name":"CVE-2026-59843","record":{"aliases":["AZL-93243","BELL-CVE-2026-59843","DEBIAN-CVE-2026-59843","ECHO-41e0-1521-8b3d","GHSA-4846-7xwg-pw5m","UBUNTU-CVE-2026-59843"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"SSH library","requires_auth":"low_privilege","summary":"A remote authenticated peer can cause a denial of service in libssh by advertising a zero maximum packet size, leading to an infinite loop and CPU exhaustion.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"libssh","vendor":"libssh"},{"product":"enterprise_linux","vendor":"redhat"},{"product":"hardened_images","vendor":"redhat"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-400","name":"Uncontrolled Resource Consumption"},{"id":"CWE-835","name":"Loop with Unreachable Exit Condition"}],"description":"A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.","ecosystems":[],"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":"Libssh: libssh: denial of service via zero advertised channel packet size","id":"CVE-2026-59843","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"redhat:enterprise_linux","products":["redhat:enterprise_linux","redhat:hardened_images"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":6,"next":{"headline":"Libssh: libssh: denial of service via oversized sftp read length","id":"CVE-2026-59844"},"packages":[],"prev":{"headline":"Libssh: libssh: information disclosure via short gssapi curve25519 public key","id":"CVE-2026-59842"},"products":["Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9","Red Hat Hardened Images"],"published":"2026-07-21","related":[{"cvss_score":8.8,"headline":"Libssh: libssh: authentication bypass via missing gssapi principal check","id":"CVE-2026-59851","kev_date_added":null,"published":"2026-07-21"},{"cvss_score":8.1,"headline":"Libssh: invalid return code for chacha20 poly1305 with openssl backend","id":"CVE-2025-5987","kev_date_added":null,"published":"2025-07-07"},{"cvss_score":7.8,"headline":"Libssh: libssh: insecure default configuration leads to local man-in-the-middle attacks on windows","id":"CVE-2025-14821","kev_date_added":null,"published":"2026-04-07"},{"cvss_score":7.5,"headline":"Memory corruption in n/a","id":"CVE-2012-4560","kev_date_added":null,"published":"2012-11-30"},{"cvss_score":7.5,"headline":"Integer overflow in n/a","id":"CVE-2012-4562","kev_date_added":null,"published":"2012-11-30"},{"cvss_score":7.5,"headline":"Use after free in n/a","id":"CVE-2012-6063","kev_date_added":null,"published":"2012-11-30"},{"cvss_score":6.9,"headline":"libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds","id":"CVE-2026-3731","kev_date_added":null,"published":"2026-03-08"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"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":"2026-09-01","vendors":["Red Hat"]},"summary":"A remote authenticated peer can cause a denial of service in libssh by advertising a zero maximum packet size, leading to an infinite loop and CPU exhaustion.","url":"https://insights.sbomify.com/CVE-2026-59843/"}