{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18257 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-18257 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-18257 is a medium-severity vulnerability in Systerel S2OPC, published on 29 Jul 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-2026-18257 and fix it if it is affected.\n\nWhat it is: CVE-2026-18257 is a medium-severity vulnerability in Systerel S2OPC, published on 29 Jul 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-2026-18257 in the wild and no public exploit code.\n\nAffected product: Systerel S2OPC. 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-2026-18257/ (Markdown: https://insights.sbomify.com/CVE-2026-18257/index.md)","id":"CVE-2026-18257","markdown":"https://insights.sbomify.com/CVE-2026-18257/index.md","name":"CVE-2026-18257","record":{"aliases":["GHSA-xph3-r29g-fwfg"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"S2OPC OPC UA library","requires_auth":"none","summary":"Attackers can bypass certificate validation in S2OPC by exploiting improper root issuer validity checks, allowing untrusted certificates to be accepted.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitLab","cpe":[],"cvss":{"score":5.6,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-295","name":"Improper Certificate Validation"}],"description":"Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Improper Certificate Validation in S2OPC","id":"CVE-2026-18257","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Authorization Bypass Through User-Controlled Key in eScriptorium","id":"CVE-2026-18258"},"packages":[],"prev":{"headline":"Private team metadata disclosure via the team search API","id":"CVE-2026-18256"},"products":["S2OPC"],"published":"2026-07-29","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":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-29","vendors":["Systerel"]},"summary":"Attackers can bypass certificate validation in S2OPC by exploiting improper root issuer validity checks, allowing untrusted certificates to be accepted.","url":"https://insights.sbomify.com/CVE-2026-18257/"}