Vulnerability-Lookup

RHSA-2026:59242

Vulnerability from csaf_opensuse - Published: 2026-08-25 01:43 - Updated: 2026-10-15 11:27

Summary

Red Hat Security Advisory: python-pyasn1 security update

Severity

Important

Notes

Topic: An update for python-pyasn1 is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values (CVE-2026-59886) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-59886

A remote attacker can exploit this by providing specially crafted BER/CER/DER-encoded ASN.1 data with a large exponent in the REAL value. When the application subsequently prints, logs, compares, or performs arithmetic on the decoded value, this can cause excessive CPU and memory consumption, leading to a denial of service (DoS).

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python-pyasn1-0:0.4.8-7.el9_8.1.src	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-pyasn1-0:0.4.8-7.el9_8.1.noarch	—	Vendor Fix fix Workaround
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:python3-pyasn1-modules-0:0.4.8-7.el9_8.1.noarch	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:59242	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2500041	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-59886	self
https://bugzilla.redhat.com/show_bug.cgi?id=2500041	external
https://www.cve.org/CVERecord?id=CVE-2026-59886	external
https://nvd.nist.gov/vuln/detail/CVE-2026-59886	external
https://github.com/pyasn1/pyasn1/commit/e60c691cb…	external
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4	external
https://github.com/pyasn1/pyasn1/security/advisor…	external

JSON

To clipboard

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}

CVE-2026-59886 (GCVE-0-2026-59886)

Vulnerability from cvelistv5 – Published: 2026-07-14 16:38 – Updated: 2026-07-15 15:44

Title

pyasn1: Uncontrolled resource consumption when converting decoded REAL values

Summary

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the univ.Real type converted its mantissa, base, and exponent value to a Python float using exact big-integer exponentiation. A BER, CER, or DER encoded REAL value only a few bytes long can carry a very large exponent, causing float conversion through prettyPrint(), str(), comparison, arithmetic, int(), or an explicit float() call to consume excessive CPU and memory and hang applications that decode untrusted ASN.1 data and then print, log, or compare decoded objects. This issue is fixed in version 0.6.4.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-15 15:43 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7637 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/pyasn1/pyasn1/security/advisor…	x_refsource_CONFIRM
https://github.com/pyasn1/pyasn1/commit/e60c691cb…	x_refsource_MISC
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
pyasn1	pyasn1	Affected: < 0.6.4

Show details on NVD website

JSON

To clipboard

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            "x_refsource_MISC"
          ],
          "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4"
        }
      ],
      "source": {
        "advisory": "GHSA-hm4w-wwcw-mr6r",
        "discovery": "UNKNOWN"
      },
      "title": "pyasn1: Uncontrolled resource consumption when converting decoded REAL values"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-59886",
    "datePublished": "2026-07-14T16:38:29.691Z",
    "dateReserved": "2026-07-07T16:40:07.983Z",
    "dateUpdated": "2026-07-15T15:44:02.717Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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