High
restrictedpython — security advisory
RestrictedPython is a tool that helps define a subset of the Python language for accepting program input in a trusted environment. Prior to 8.4, RestrictedPython could allow a sandbox escape when a custom import policy or globals exposed the standard library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to restricted code. The string.Formatter methods format, get_field, get_value, and vformat performed attribute and item traversal internally without passing through RestrictedPython's safer_getattr protections. Restricted code could use those live object references to reach function globals, builtins, file access, or code execution primitives, affecting confidentiality, integrity, and availability in the host environment. This issue is fixed in version 8.4.
- Products
- restrictedpython
- Affected versions
- 3.6.0-0ubuntu4, 4.0~b3-2, 4.0~b3-2ubuntu0.1~esm1, 4.0~b3-2ubuntu1, 4.0~b3-3, 4.0~b3-3ubuntu0.1~esm1, 6.2-1, 6.2-1ubuntu0.24.04.1~esm1, 8.0-1, 8.1-1, 8.4-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-76825
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:18 UTC · Revision 1
Source evidence
RestrictedPython is a tool that helps define a subset of the Python language for accepting program input in a trusted environment. Prior to 8.4, RestrictedPython could allow a sandbox escape when a custom import policy or globals exposed the standard library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to restricted code. The string.Formatter methods format, get_field, get_value, and vformat performed attribute and item traversal internally without passing through RestrictedPython's safer_getattr protections. Restricted code could use those live object references to reach function globals, builtins, file access, or code execution primitives, affecting confidentiality, integrity, and availability in the host environment. This issue is fixed in version 8.4.
osv:UBUNTU-CVE-2026-76825
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
restrictedpython
Fixed versions: Not specified
Complete source record
{
"id": "1326e9db579aa66caa82265e2347a4aeab697f690ecae1a0a43f16b1f8dbd734",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-76825",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-76825",
"summary": "RestrictedPython is a tool that helps define a subset of the Python language for accepting program input in a trusted environment. Prior to 8.4, RestrictedPython could allow a sandbox escape when a custom import policy or globals exposed the standard library string module, the string.Formatter class, a Formatter instance, or a Formatter subclass to restricted code. The string.Formatter methods format, get_field, get_value, and vformat performed attribute and item traversal internally without passing through RestrictedPython's safer_getattr protections. Restricted code could use those live object references to reach function globals, builtins, file access, or code execution primitives, affecting confidentiality, integrity, and availability in the host environment. This issue is fixed in version 8.4.",
"evidence": "osv:UBUNTU-CVE-2026-76825",
"products": [
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.0-0ubuntu4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.6.0-0ubuntu4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0~b3-2",
"evidence": "/affected/2/versions"
},
{
"value": "4.0~b3-2ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0~b3-2",
"evidence": "/affected/3/versions"
},
{
"value": "4.0~b3-2ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "4.0~b3-3",
"evidence": "/affected/3/versions"
},
{
"value": "4.0~b3-3ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.0~b3-3",
"evidence": "/affected/4/versions"
},
{
"value": "6.2-1",
"evidence": "/affected/4/versions"
},
{
"value": "6.2-1ubuntu0.24.04.1~esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.1-1",
"evidence": "/affected/5/versions"
},
{
"value": "8.4-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "restrictedpython",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.0-1",
"evidence": "/affected/6/versions"
},
{
"value": "8.1-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-76825",
"aliases": [
"UBUNTU-CVE-2026-76825"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"3.6.0-0ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-restrictedpython",
"binary_version": "3.6.0-0ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"3.6.0-0ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-restrictedpython",
"binary_version": "3.6.0-0ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"4.0~b3-2",
"4.0~b3-2ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-restrictedpython",
"binary_version": "4.0~b3-2ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"4.0~b3-2",
"4.0~b3-2ubuntu1",
"4.0~b3-3",
"4.0~b3-3ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-restrictedpython",
"binary_version": "4.0~b3-3ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"4.0~b3-3",
"6.2-1",
"6.2-1ubuntu0.24.04.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-restrictedpython",
"binary_version": "6.2-1ubuntu0.24.04.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"8.1-1",
"8.4-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-restrictedpython",
"binary_version": "8.4-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "restrictedpython",
"purl": "pkg:deb/ubuntu/restrictedpython?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"8.0-1",
"8.1-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76825.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-restrictedpython",
"binary_version": "8.1-1"
}
]
}
}
],
"modified": "2026-10-17T13:01:06.612146543Z",
"provider": "osv",
"upstream": [
"CVE-2026-76825"
],
"references": [
"https://ubuntu.com/security/CVE-2026-76825",
"https://www.cve.org/CVERecord?id=CVE-2026-76825"
]
},
"related_cves": [
{
"value": "CVE-2026-76825",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360990,
"published_at": "2026-09-16T15:17:00+00:00"
}