usn-8134-1
Vulnerability from osv_ubuntu
Published
2026-03-30 19:57
Modified
2026-07-15 17:24
Summary
pyasn1 vulnerabilities
Details
It was discovered that pyasn1 could exhaust system resources when attempting to decode a malformed certificate. An attacker could possibly use this to cause a denial of service. (CVE-2026-23490)
Kevin Tu discovered that pyasn1 could exhaust system resources via uncontrolled recursion when attempting to decode malicously-crafted certificates. An attacker could possibly use this to cause a denial of service. (CVE-2026-30922)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-23490",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-30922",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:14.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "python-pyasn1",
"binary_version": "0.1.7-1ubuntu2.1+esm1"
},
{
"binary_name": "python3-pyasn1",
"binary_version": "0.1.7-1ubuntu2.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "pyasn1",
"purl": "pkg:deb/ubuntu/pyasn1@0.1.7-1ubuntu2.1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.7-1ubuntu2.1+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.4-0ubuntu1",
"0.1.7-1ubuntu1",
"0.1.7-1ubuntu2",
"0.1.7-1ubuntu2.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-23490",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-30922",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "pypy-pyasn1",
"binary_version": "0.1.9-1ubuntu0.1~esm1"
},
{
"binary_name": "python-pyasn1",
"binary_version": "0.1.9-1ubuntu0.1~esm1"
},
{
"binary_name": "python3-pyasn1",
"binary_version": "0.1.9-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "pyasn1",
"purl": "pkg:deb/ubuntu/pyasn1@0.1.9-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.9-1ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.8-2",
"0.1.9-1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-23490",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-30922",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "pypy-pyasn1",
"binary_version": "0.4.2-3ubuntu0.18.04.1~esm1"
},
{
"binary_name": "python-pyasn1",
"binary_version": "0.4.2-3ubuntu0.18.04.1~esm1"
},
{
"binary_name": "python3-pyasn1",
"binary_version": "0.4.2-3ubuntu0.18.04.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "pyasn1",
"purl": "pkg:deb/ubuntu/pyasn1@0.4.2-3ubuntu0.18.04.1~esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.2-3ubuntu0.18.04.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1.9-2",
"0.4.2-3"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2026-23490",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2026-30922",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:Pro:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "pypy-pyasn1",
"binary_version": "0.4.2-3ubuntu0.20.04.1~esm1"
},
{
"binary_name": "python-pyasn1",
"binary_version": "0.4.2-3ubuntu0.20.04.1~esm1"
},
{
"binary_name": "python3-pyasn1",
"binary_version": "0.4.2-3ubuntu0.20.04.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "pyasn1",
"purl": "pkg:deb/ubuntu/pyasn1@0.4.2-3ubuntu0.20.04.1~esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.2-3ubuntu0.20.04.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.4.2-3",
"0.4.2-3build1"
]
}
],
"aliases": [],
"details": "It was discovered that pyasn1 could exhaust system resources when\nattempting to decode a malformed certificate. An attacker could\npossibly use this to cause a denial of service. (CVE-2026-23490)\n\nKevin Tu discovered that pyasn1 could exhaust system resources via\nuncontrolled recursion when attempting to decode malicously-crafted\ncertificates. An attacker could possibly use this to cause a denial of\nservice. (CVE-2026-30922)",
"id": "USN-8134-1",
"modified": "2026-07-15T17:24:50Z",
"published": "2026-03-30T19:57:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8134-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-23490"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-30922"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "pyasn1 vulnerabilities",
"upstream": [
"UBUNTU-CVE-2026-23490",
"UBUNTU-CVE-2026-30922"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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