Uncaught Exception Affecting python-asteval package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ECHOLATEST-PYTHONASTEVAL-19883810
- published17 Sept 2026
- disclosed14 Sept 2026
Introduced: 14 Sep 2026
NewCVE-2026-55244 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest python-asteval.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-asteval package and not the python-asteval package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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.
References
- https://advisory.echohq.com/cve/CVE-2026-55244
- https://github.com/lmfit/asteval/commit/9c625b3674f8d05f206708bb85afca17a87694a4
- https://github.com/lmfit/asteval/commit/c49c99a67acb63eb7410231932250bd820380e45
- https://github.com/lmfit/asteval/pull/153
- https://github.com/lmfit/asteval/releases/tag/1.0.9
- https://github.com/lmfit/asteval/security/advisories/GHSA-89v8-rhwq-hf77