CVE-2026-55244

{"id": "CVE-2026-55244", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55244", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-16T16:17:25.234532Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.0, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.3}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "lmfit", "product": "asteval", "versions": [{"status": "affected", "version": "< 1.0.9"}]}]}], "published": "2026-09-14T20:16:47.640", "references": [{"url": "https://github.com/lmfit/asteval/commit/9c625b3674f8d05f206708bb85afca17a87694a4", "source": "security-advisories@github.com"}, {"url": "https://github.com/lmfit/asteval/commit/c49c99a67acb63eb7410231932250bd820380e45", "source": "security-advisories@github.com"}, {"url": "https://github.com/lmfit/asteval/pull/153", "source": "security-advisories@github.com"}, {"url": "https://github.com/lmfit/asteval/releases/tag/1.0.9", "source": "security-advisories@github.com"}, {"url": "https://github.com/lmfit/asteval/security/advisories/GHSA-89v8-rhwq-hf77", "source": "security-advisories@github.com"}, {"url": "https://github.com/lmfit/asteval/security/advisories/GHSA-89v8-rhwq-hf77", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-248"}]}], "descriptions": [{"lang": "en", "value": "ASTEVAL is an evaluator of Python expressions and statements. Prior to 1.0.9, FROM_PY in asteval/astutils.py exposes BaseException, SystemExit, KeyboardInterrupt, and GeneratorExit to expressions evaluated by asteval.Interpreter.eval(), while run() and eval() in asteval/asteval.py catch Exception rather than these non-Exception BaseException subclasses. When an attacker-controlled expression raises one of these classes, on_raise() passes the class to raise_exception(), and the resulting exception bypasses the interpreter's safety handlers and propagates into the calling application. A consuming service that evaluates untrusted expressions can therefore be terminated or have signal and cleanup handling disrupted, causing denial of service. The separately documented read-only open() capability is not part of this vulnerability. This issue is fixed in version 1.0.9."}], "lastModified": "2026-09-16T17:17:21.253", "sourceIdentifier": "security-advisories@github.com"}