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CVE-2026-119195: pyasn1: Quadratic-time denial of service in constructed string and indefinite-length ANY decoding

CVE-2026-119195 is a vulnerability in pyasn1: Quadratic-time denial of service in constructed string and indefinite-length ANY decoding, rated Important by Microsoft, with a CVSS 3.1 base score of 7.5 (High). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.53% probability of exploitation activity in the next 30 days, higher than 45% of all scored vulnerabilities. Microsoft released the fix on 31 October 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).

Key facts

CVE ID
CVE-2026-119195
Severity
High CVSS 7.5
Microsoft severity
Important
Exploited in the wild
No
Publicly disclosed
No
Weakness
CWE-407
EPSS
0.53% (percentile 45%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
October 2026 Patch Tuesday
Product families
Open Source Software

CVSS score and vector

Microsoft scores CVE-2026-119195 at 7.5 (temporal 7.5) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

MetricValue
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
Confidentiality impactNone
Integrity impactNone
Availability impactHigh

Affected products (1)

Open Source Software

ProductSecurity updateTypeFixed buildRestart
azl3 python-pyasn1 0.4.8-3 on Azure Linux 3.0Release NotesSecurity Update

NIST NVD data

NVD status
Awaiting Analysis
NVD CVSS
7.5 (HIGH)
NVD weakness
CWE-407
Published to NVD
NVD last modified

References

Revision history

VersionDateDescription
1.0Information published.

Sources