OESA-2026-1776

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-1776
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-1776.json
JSON Data
https://api.test.osv.dev/v1/vulns/OESA-2026-1776
Upstream
Published
2026-03-27T14:07:53Z
Modified
2026-03-27T14:19:22.462322Z
Summary
python-pyasn1 security update
Details

Abstract Syntax Notation One (ASN.1) is a technology for exchanging structured data in a universally understood, hardware agnostic way. Many industrial, security and telephony applications heavily rely on ASN.1. The pyasn1 library implements ASN.1 support in pure-Python.

Security Fix(es):

The pyasn1 library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing nested SEQUENCE (0x30) or SET (0x31) tags with Indefinite Length (0x80) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a RecursionError or consumes all available memory (OOM), crashing the host application. The vulnerability exists in the indefLenValueDecoder, valueDecoder, and _decodeComponentsSchemaless functions, which recursively invoke the decoding callback decodeFun without passing a depth parameter or checking against a global MAX_ASN1_NESTING limit. Any service using pyasn1 to parse untrusted ASN.1 data (e.g., LDAP, SNMP, Kerberos, X.509 parsers) can be crashed remotely.(CVE-2026-30922)

Database specific 
{
    "severity": "High"
}
References

Affected packages

openEuler:24.03-LTS-SP3 / python-pyasn1

Package

Name
python-pyasn1
Purl
pkg:rpm/openEuler/python-pyasn1&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.5.1-3.oe2403sp3

Ecosystem specific 

{
    "noarch": [
        "python-pyasn1-help-0.5.1-3.oe2403sp3.noarch.rpm",
        "python3-pyasn1-0.5.1-3.oe2403sp3.noarch.rpm"
    ],
    "src": [
        "python-pyasn1-0.5.1-3.oe2403sp3.src.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-1776.json"