{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-3591 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-3591 is a medium-severity use after free vulnerability in Isc Bind, published on 25 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-3591 and fix it if it is affected.\n\nWhat it is: CVE-2026-3591 is a medium-severity use after free vulnerability in Isc Bind, published on 25 Mar 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-2026-3591 in the wild and no public exploit code.\n\nAffected product: Isc Bind. 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-2026-3591/ (Markdown: https://insights.sbomify.com/CVE-2026-3591/index.md)","id":"CVE-2026-3591","markdown":"https://insights.sbomify.com/CVE-2026-3591/index.md","name":"CVE-2026-3591","record":{"aliases":["ALPINE-CVE-2026-3591","AZL-80987","BELL-CVE-2026-3591","DEBIAN-CVE-2026-3591","GHSA-5fv2-2p94-9gh7","MINI-cmfx-9wr9-2pwv","UBUNTU-CVE-2026-3591"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":true,"product_category":"BIND DNS server","requires_auth":"low_privilege","summary":"A stack use-after-return in BIND's SIG(0) handling allows attackers to bypass IP-based ACLs, potentially granting unauthorized access to DNS services.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"isc","cpe":[{"product":"bind","vendor":"isc"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-562","name":"Return of Stack Variable Address"},{"id":"CWE-305","name":"Authentication Bypass by Primary Weakness"}],"description":"A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.","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":"A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass","id":"CVE-2026-3591","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"isc:bind","products":["isc:bind"],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Amplification vulnerabilities via self-pointed glue records","id":"CVE-2026-3592"},"packages":[],"prev":{"headline":"Race Condition in Guest Magic Link Authentication Allows Token Reuse","id":"CVE-2026-3590"},"products":["BIND 9"],"published":"2026-03-25","related":[{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2008-0122","kev_date_added":null,"published":"2008-01-16"},{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2001-0010","kev_date_added":null,"published":"2001-05-07"},{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2001-0011","kev_date_added":null,"published":"2001-05-07"},{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2001-0013","kev_date_added":null,"published":"2001-05-07"},{"cvss_score":10,"headline":"Memory corruption in n/a","id":"CVE-2000-1029","kev_date_added":null,"published":"2000-11-29"},{"cvss_score":10,"headline":"Denial of service in n/a","id":"CVE-1999-0837","kev_date_added":null,"published":"2000-01-04"},{"cvss_score":8.5,"headline":"Denial of service in n/a","id":"CVE-2012-1667","kev_date_added":null,"published":"2012-06-05"}],"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":"2026-03-25","vendors":["ISC"]},"summary":"A stack use-after-return in BIND's SIG(0) handling allows attackers to bypass IP-based ACLs, potentially granting unauthorized access to DNS services.","url":"https://insights.sbomify.com/CVE-2026-3591/"}