What is CVE-2026-18257?
An improper validity period check for root issuer certificates in the CycloneCrypto cryptographic wrapper allows certificates issued by this root to be trusted even if the root has expired. This vulnerability affects systems using the S2OPC module. Users are advised to apply patches or update to a secure version of the library.
Azərbaycanca: CycloneCrypto kriptoqrafik kitabxanasında kök sertifikatın etibarlılıq müddətinin düzgün yoxlanılmaması səbəbindən, vaxtı keçmiş kök tərəfindən verilmiş sertifikatlar etibarlı hesab oluna bilər. Bu zəiflik S2OPC modulunu istifadə edən sistemlərə təsir göstərir. İstifadəçilərə yamaqları tətbiq etmək və ya kitabxananı təhlükəsiz versiyaya yeniləmək tövsiyə olunur.
Related CVEs
link basis: same weakness class CWE-20
FAQ2
In which library was CVE-2026-18257 discovered and what is its root cause?
The vulnerability was discovered in the CycloneCrypto cryptographic library. The root cause is an improper validity period check for root issuer certificates, which allows certificates issued by an expired root to be trusted.
What measures should be taken for systems affected by CVE-2026-18257?
Users are advised to apply patches or update the CycloneCrypto library to a secure version. This vulnerability specifically affects systems using the S2OPC module.
See also6
This explainer is AI-written from source data — skopnix's own reporting on this CVE; CVSS scores, vendors and versions are never invented. See NVD for the official record.