CVE-2026-35379

#!/bin/bash # PoC for CVE-2026-35379: Incorrect [:graph:] and [:print:] handling # Expected: Keep spaces, remove 'a' and 'b'. Result should be " " (spaces) # Actual in vulnerable version: Removes spaces and 'a', 'b'. Result is empty. echo "Testing CVE-2026-35379" INPUT_DATA="a b c" echo "Original input: '${INPUT_DATA}'" # Intention: Delete graphical characters to keep whitespace # Vulnerable behavior: Deletes spaces (0x20) because they are wrongly in [:graph:] echo "Processing with: tr -d '[:graph:]'" RESULT=$(echo "${INPUT_DATA}" | tr -d '[:graph:]') echo "Result: '${RESULT}'" if [ -z "$RESULT" ]; then echo "[!] Vulnerability confirmed: Spaces were deleted." else echo "[+] Not vulnerable or patched." fi

{"cve": {"id": "CVE-2026-35379", "sourceIdentifier": "[email protected]", "published": "2026-04-22T17:16:42.887", "lastModified": "2026-04-29T15:59:08.450", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A logic error in the tr utility of uutils coreutils causes the program to incorrectly define the [:graph:] and [:print:] character classes. The implementation mistakenly includes the ASCII space character (0x20) in the [:graph:] class and excludes it from the [:print:] class, effectively reversing the standard behavior established by POSIX and GNU coreutils. This vulnerability leads to unintended data modification or loss when the utility is used in automated scripts or data-cleaning pipelines that rely on standard character class semantics. For example, a command executed to delete all graphical characters while intending to preserve whitespace will incorrectly delete all ASCII spaces, potentially resulting in data corruption or logic failures in downstream processing."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N", "baseScore": 3.3, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-684"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:uutils:coreutils:*:*:*:*:*:rust:*:*", "versionEndExcluding": "0.8.0", "matchCriteriaId": "2365DBBD-6F10-4651-8DA4-08AE79E14423"}]}]}], "references": [{"url": "https://github.com/uutils/coreutils/pull/11405", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Patch"]}, {"url": "https://github.com/uutils/coreutils/releases/tag/0.8.0", "source": "[email protected]", "tags": ["Release Notes"]}]}}