{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-42013 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-42013 is a high-severity vulnerability in Cert Manager support for Red Hat OpenShift release 1.17, published on 26 May 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-2026-42013 and fix it if it is affected.\n\nWhat it is: CVE-2026-42013 is a high-severity vulnerability in Cert Manager support for Red Hat OpenShift release 1.17, published on 26 May 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-2026-42013 in the wild and no public exploit code.\n\nAffected product: Cert Manager support for Red Hat OpenShift release 1.17. 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-2026-42013/ (Markdown: https://insights.sbomify.com/CVE-2026-42013/index.md)","id":"CVE-2026-42013","markdown":"https://insights.sbomify.com/CVE-2026-42013/index.md","name":"CVE-2026-42013","record":{"aliases":["ALPINE-CVE-2026-42013","AZL-89178","BELL-CVE-2026-42013","DEBIAN-CVE-2026-42013","ECHO-0a73-78d8-34d4","GHSA-2pw7-g86g-76q7"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"GnuTLS library","requires_auth":"none","summary":"Remote attackers can bypass certificate validation via oversized Subject Alternative Names, enabling spoofing and man-in-the-middle attacks.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":8.2,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.","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":"Gnutls: gnutls: certificate validation bypass due to oversized subject alternative name","id":"CVE-2026-42013","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":0,"n_references":35,"next":{"headline":"Gnutls: gnutls: use-after-free in gnutls_pkcs11_token_set_pin","id":"CVE-2026-42014"},"packages":[],"prev":{"headline":"Gnutls: gnutls: certificate validation bypass due to improper handling of uri and srv sans","id":"CVE-2026-42012"},"products":["Cert Manager support for Red Hat OpenShift release 1.17","Cert Manager support for Red Hat OpenShift release 1.18","Cert Manager support for Red Hat OpenShift release 1.20","Red Hat Discovery 2","Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 10.0 Extended Update Support","Red Hat Enterprise Linux 6","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 Hardened Images","Red Hat OpenShift AI 3.4","Red Hat OpenShift Container Platform 4","Red Hat OpenShift Container Platform 4.12","Red Hat OpenShift Container Platform 4.16","Red Hat OpenShift Container Platform 4.17","Red Hat OpenShift Container Platform 4.18","Red Hat OpenShift Container Platform 4.19","Red Hat OpenShift Container Platform 4.20","Red Hat OpenShift Container Platform 4.21","Red Hat OpenShift Container Platform 4.22","Red Hat Update Infrastructure 5"],"published":"2026-05-26","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":"2026-10-29","vendors":["Red Hat"]},"summary":"Remote attackers can bypass certificate validation via oversized Subject Alternative Names, enabling spoofing and man-in-the-middle attacks.","url":"https://insights.sbomify.com/CVE-2026-42013/"}