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pyasn1 CVE-2026-59885

| EUVDEUVD-2026-43955 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-07-14 GitHub_M GHSA-8ppf-4f7h-5ppj
Python Denial Of Service Pyasn1 Red Hat Suse
7.5
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Remote unauthenticated attacker (AV:N/PR:N/UI:N) with a simple crafted OID (AC:L) causes CPU-exhaustion DoS; availability-only impact (A:H, C/I:N) with no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Patch available
Jul 14, 2026 - 23:21 EUVD
Source Code Evidence Fetched
Jul 14, 2026 - 17:32 vuln.today
Analysis Generated
Jul 14, 2026 - 17:32 vuln.today
CVE Published
Jul 14, 2026 - 16:40 cve.org
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 21,483 pypi packages depend on pyasn1 (479 direct, 21,117 indirect)

Ecosystem-wide dependent count for version 0.6.4.

DescriptionCVE.org

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.

Articles & Coverage 1

News 14 New Python Vulnerabilities - 14 High Severity, 1 With POC Jul 15, 2026

AnalysisAI

Denial of service in the pyasn1 Python ASN.1 library (all versions prior to 0.6.4) allows remote attackers to exhaust CPU by submitting a small crafted OBJECT IDENTIFIER or RELATIVE-OID whose arcs are decoded in quadratic time, so any application that calls decode() on untrusted ASN.1 data can be stalled per call; re-encoding such values triggers the same blow-up. Rated CVSS 7.5 (availability-only) with no confidentiality or integrity impact; no public exploit identified at time of analysis, though the fix commit ships a regression test that effectively demonstrates the trigger. As a foundational dependency behind LDAP, SNMP, X.509/PKI and crypto tooling across the Python ecosystem, its broad transitive reach makes this notable despite the modest severity.

Technical ContextAI

pyasn1 implements the ASN.1 BER/CER/DER codecs used to parse and emit binary structures for protocols such as LDAP, SNMP, Kerberos, and X.509 certificates. The root cause is CWE-400 (Uncontrolled Resource Consumption): in ber/decoder.py the OID and RELATIVE-OID value decoders accumulated arcs into an immutable Python tuple using repeated 'oid += (subId,)' concatenation, and the ber/encoder.py path built output octets the same way. Because each concatenation copies the entire growing tuple, appending N arcs costs O(N^2) work; a payload with thousands of single-byte arcs therefore consumes CPU disproportionate to its size. The 0.6.4 fix replaces tuple concatenation with mutable list append/extend and only converts to a tuple once at the end (yielding tuple(oid)), reducing decode/encode to linear time. The affected package is identified by cpe:2.3:a:pyasn1:pyasn1:*:*:*:*:*:*:*:* with all versions below 0.6.4 in scope.

RemediationAI

Vendor-released patch: upgrade pyasn1 to version 0.6.4 or later (pip install --upgrade 'pyasn1>=0.6.4'), and update any downstream packages or lockfiles that transitively pin an older pyasn1; see the advisory at https://github.com/pyasn1/pyasn1/security/advisories/GHSA-8ppf-4f7h-5ppj and release https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4. If immediate upgrade is not possible, apply compensating controls on any code path that decodes untrusted ASN.1: cap the maximum accepted payload/BER length before calling decoder.decode() so oversized OID-heavy blobs are rejected early (trade-off: may reject legitimate large but valid structures), enforce a per-request CPU/wall-clock timeout or run decoding in a bounded worker so a single slow decode cannot pin a process, and restrict or authenticate the exposed endpoints that accept ASN.1 input (e.g., LDAP/SNMP/certificate parsers) to reduce untrusted exposure. Avoid re-encoding attacker-supplied decoded values on vulnerable versions, since the encoder shares the same quadratic behavior.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Python 3 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4 SUSE Linux Enterprise Module for Public Cloud 15 SP4 SUSE Linux Enterprise Server 15 SP4 SUSE Manager Proxy 4.3 SUSE Manager Retail Branch Server 4.3 SUSE Manager Server 4.3 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-59885 vulnerability details – vuln.today
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