SUSE-SU-2026:22765-1

Vulnerability from csaf_suse - Published: 2026-07-20 12:15 - Updated: 2026-10-12 17:27
Summary
Security update for python-pyasn1
Severity
Important
Notes
Title of the patch: Security update for python-pyasn1
Description of the patch: This update for python-pyasn1 fixes the following issues: - CVE-2026-59884: BER/CER/DER decoder denial of service via unbounded long-form tag IDs (bsc#1271464). - CVE-2026-59885: quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID processing allows denial of service (bsc#1271465). - CVE-2026-59886: uncontrolled resource consumption when converting decoded REAL values (bsc#1271466).
Patchnames: SUSE-SL-Micro-6.2-1301
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
CVE-2026-59884
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Product Identifier Version Remediation
Unresolved product id: SUSE Linux Micro 6.2:python313-pyasn1-0:0.6.1-160000.5.1.noarch —
Vendor Fix
Threats
Impact important
CVE-2026-59885
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 1 product, the same list as for CVE-2026-59884
Threats
Impact important
CVE-2026-59886
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 1 product, the same list as for CVE-2026-59884
Threats
Impact important
References
To clipboard 

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          "text": "pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the tag ID size, allowing a crafted input to force construction of an arbitrarily large integer with CPU cost growing quadratically and to trigger unhandled ValueError exceptions in Python 3.11+ error formatting paths. Any application decoding untrusted BER, CER, or DER input is affected. This issue is fixed in version 0.6.4.",
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        {
          "category": "general",
          "text": "pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.",
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  ]
}



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