DEBIAN-CVE-2026-55244
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.
DEBIAN-CVE-2026-55244
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-55244
python-asteval
Source reference: /affected/0/package/name
- Affected versions
- 0.9.28-1
Source reference:
/affected/0/versions0.9.30-1Source reference:
/affected/0/versions0.9.31-1Source reference:
/affected/0/versions1.0.6-1Source reference:
/affected/0/versions1.0.6-2Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
python-asteval
Source reference: /affected/1/package/name
- Affected versions
- 1.0.6-2
Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
python-asteval
Source reference: /affected/2/package/name
- Affected versions
- 1.0.6-2
Source reference:
/affected/2/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-asteval",
"purl": "pkg:deb/debian/python-asteval?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"0.9.28-1",
"0.9.30-1",
"0.9.31-1",
"1.0.6-1",
"1.0.6-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55244.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-asteval",
"purl": "pkg:deb/debian/python-asteval?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.0.6-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55244.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-asteval",
"purl": "pkg:deb/debian/python-asteval?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.0.6-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55244.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #59424 · Revision 1
- Added to Heist Feed
- Publisher date