| Name | CVE-2026-55244 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1148447 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| python-asteval (PTS) | bookworm | 0.9.28-1 | vulnerable |
| forky, sid, trixie | 1.0.6-2 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| python-asteval | source | (unstable) | (unfixed) | 1148447 |
[trixie] - python-asteval <no-dsa> (Minor issue)
[bookworm] - python-asteval <postponed> (Minor issue)
https://github.com/lmfit/asteval/security/advisories/GHSA-89v8-rhwq-hf77
https://github.com/lmfit/asteval/pull/153
Fixed by: https://github.com/lmfit/asteval/commit/9c625b3674f8d05f206708bb85afca17a87694a4 (1.0.9)
Fixed by: https://github.com/lmfit/asteval/commit/c49c99a67acb63eb7410231932250bd820380e45 (1.0.9)