{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-12490 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-12490 is a high-severity authentication bypass vulnerability in NLnet Labs NSD, published on 25 Jun 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-2026-12490 and fix it if it is affected.\n\nWhat it is: CVE-2026-12490 is a high-severity authentication bypass vulnerability in NLnet Labs NSD, published on 25 Jun 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-2026-12490 in the wild and no public exploit code.\n\nAffected product: NLnet Labs NSD. 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-2026-12490/ (Markdown: https://insights.sbomify.com/CVE-2026-12490/index.md)","id":"CVE-2026-12490","markdown":"https://insights.sbomify.com/CVE-2026-12490/index.md","name":"CVE-2026-12490","record":{"aliases":["ALPINE-CVE-2026-12490","DEBIAN-CVE-2026-12490","GHSA-27xx-c7vg-hjjj","UBUNTU-CVE-2026-12490","USN-8474-1"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"NSD DNS server","requires_auth":"none","summary":"Attackers can bypass client certificate verification for DNS zone transfers by using the standard TLS or TCP port instead of the dedicated authentication port.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"NLnet Labs","cpe":[{"product":"nsd","vendor":"nlnetlabs"}],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-284","name":"Improper Access Control"}],"description":"When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.","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":"Bypass of client certificate verification with transfer over TLS","id":"CVE-2026-12490","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"vLLM: image EXIF Rotation \u0026 PNG tRNS Transparency Not Normalized, Causing Mismatch Between Model Input and Expectations","id":"CVE-2026-12491"},"packages":[],"prev":{"headline":"An incorrect authorization vulnerability in the Data Access Layer (DAL) of Zyxel EX3501-T0 firmware versions through 5.44(ACHR.6)C0 could al","id":"CVE-2026-12489"},"products":["NSD"],"published":"2026-06-25","related":[{"cvss_score":8.7,"headline":"Heap overflow and crash with crafted SVCB RR","id":"CVE-2026-12244","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":8.7,"headline":"Denial of DNS over TLS service by any DoT client","id":"CVE-2026-12245","kev_date_added":null,"published":"2026-06-25"},{"cvss_score":8.2,"headline":"Wrong interpretation of ACL ranges","id":"CVE-2026-18664","kev_date_added":null,"published":"2026-08-26"},{"cvss_score":8.2,"headline":"Remote UDP DoS by sending multiple DNS Cookie options","id":"CVE-2026-19401","kev_date_added":null,"published":"2026-08-26"},{"cvss_score":8.2,"headline":"Bypass of BLOCKED ACL items on proxy protocol port over TCP or TLS","id":"CVE-2026-19538","kev_date_added":null,"published":"2026-08-26"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2016-6173","kev_date_added":null,"published":"2017-02-09"}],"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":"2026-06-25","vendors":["NLnet Labs"]},"summary":"Attackers can bypass client certificate verification for DNS zone transfers by using the standard TLS or TCP port instead of the dedicated authentication port.","url":"https://insights.sbomify.com/CVE-2026-12490/"}