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{"cveTags": [], "descriptions": [{"lang": "en", "value": "A Time-of-Check to Time-of-Use (TOCTOU) vulnerability exists in the split utility of uutils coreutils. The program attempts to prevent data loss by checking for identity between input and output files using their file paths before initiating the split operation. However, the utility subsequently opens the output file with truncation after this path-based validation is complete. A local attacker with write access to the directory can exploit this race window by manipulating mutable path components (e.g., swapping a path with a symbolic link). This can cause split to truncate and write to an unintended target file, potentially including the input file itself or other sensitive files accessible to the process, leading to permanent data loss."}], "id": "CVE-2026-35374", "lastModified": "2026-04-22T21:23:52.620", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 5.2, "source": "security@ubuntu.com", "type": "Secondary"}]}, "published": "2026-04-22T17:16:42.127", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/uutils/coreutils/pull/11401"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-22T18:03:24.765880+00:00", "value": {"mitigation_remediation": ["Update uutils coreutils to the latest version that includes the patch from pull request 11401.", "Restrict write and symlink permissions on the directories used by split to prevent untrusted users from manipulating path components.", "Ensure the process running split does not have access to sensitive files that could be overwritten and that output files are created with secure permissions."], "summary": {"action": "Immediate Patch", "impact": "Local data truncation and loss"}, "threat_synthesis": {"affected_systems": "Uutils coreutils, specifically the split component, is affected. No specific version information is provided, so all released versions that include split are potentially vulnerable until the patch is applied.", "description_and_impact": "The split utility checks that the input and output files do not share the same file path before starting the split operation. The check, however, is performed before the output file is opened with truncation, creating a race window. A local attacker who can write to the directory may change a path component such as a symbolic link during that window. This can cause split to truncate and write to an unintended target file, including the input file itself or any other file the process can access, resulting in permanent data loss.", "risk_and_exploitability": "The CVSS score of 6.3 indicates a moderate risk, but the absence of an EPSS score and its non\u2013appearance in the KEV catalog mean it has not yet been observed in the wild. The flaw is exploitable by an attacker with local write access to the directory containing the input and output files, which is common on many systems. The direct impact is data truncation and loss, which can compromise critical data or system integrity."}}}}, "created": "2026-04-22T18:15:15.480664+00:00", "updated": "2026-04-22T18:15:15.480674+00:00", "vendors": []}