UBUNTU-CVE-2026-30922
The pyasn1 Python library versions prior to 0.6.3 are vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can craft payloads with thousands of nested SEQUENCE or SET tags using Indefinite Length markers, causing the decoder to recurse until the Python interpreter crashes or exhausts system memory. This vulnerability is distinct from a previous integer overflow issue and is fixed in version 0.6.3.
AI Analysis
Technical Summary
pyasn1 versions before 0.6.3 contain a vulnerability where decoding ASN.1 data with deeply nested SEQUENCE (0x30) or SET (0x31) tags marked with Indefinite Length (0x80) triggers uncontrolled recursion. This leads to a Denial of Service by causing a RecursionError or out-of-memory condition in the Python interpreter. The issue is separate from CVE-2026-23490 and is specifically addressed in pyasn1 version 0.6.3.
Potential Impact
Successful exploitation results in a Denial of Service condition by crashing the Python interpreter or consuming all available memory, causing the host application to fail. There is no impact on confidentiality or integrity.
Mitigation Recommendations
A fix is available in pyasn1 version 0.6.3. Users should upgrade to version 0.6.3 or later to remediate this vulnerability. No other mitigations are indicated.
UBUNTU-CVE-2026-30922
Description
The pyasn1 Python library versions prior to 0.6.3 are vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can craft payloads with thousands of nested SEQUENCE or SET tags using Indefinite Length markers, causing the decoder to recurse until the Python interpreter crashes or exhausts system memory. This vulnerability is distinct from a previous integer overflow issue and is fixed in version 0.6.3.
CVSS v3.1
Score 7.5high
Affected software
pkg:deb/ubuntu/[email protected]+esm1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-infra/xenialpkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/[email protected]~esm1?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/[email protected]?arch=source&distro=jammypkg:deb/ubuntu/[email protected]?arch=source&distro=noblepkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
pyasn1 versions before 0.6.3 contain a vulnerability where decoding ASN.1 data with deeply nested SEQUENCE (0x30) or SET (0x31) tags marked with Indefinite Length (0x80) triggers uncontrolled recursion. This leads to a Denial of Service by causing a RecursionError or out-of-memory condition in the Python interpreter. The issue is separate from CVE-2026-23490 and is specifically addressed in pyasn1 version 0.6.3.
Potential Impact
Successful exploitation results in a Denial of Service condition by crashing the Python interpreter or consuming all available memory, causing the host application to fail. There is no impact on confidentiality or integrity.
Mitigation Recommendations
A fix is available in pyasn1 version 0.6.3. Users should upgrade to version 0.6.3 or later to remediate this vulnerability. No other mitigations are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-30922
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a58b4d868715ace43dabbe6
Added to database: 07/16/2026, 10:39:20 UTC
Last enriched: 07/16/2026, 13:34:01 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 32
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