Vulnerability-Lookup

RHSA-2026:58820

Vulnerability from csaf_redhat - Published: 2026-08-24 06:33 - Updated: 2026-10-14 23:08

Summary

Red Hat Security Advisory: resource-agents security update

Severity

Important

Notes

Topic: An update for resource-agents is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. 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: The resource-agents packages provide the Pacemaker and RGManager service managers with a set of scripts. These scripts interface with several services to allow operating in a high-availability (HA) environment. 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 14 products

Product	Version	Remediation
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-0:4.1.1-90.el8_4.27.src	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-aliyun-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-aliyun-debuginfo-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-debuginfo-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-debugsource-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.AUS:resource-agents-gcp-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-0:4.1.1-90.el8_4.27.src	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-aliyun-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-aliyun-debuginfo-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-debuginfo-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-debugsource-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-gcp-0:4.1.1-90.el8_4.27.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:58820	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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  "vulnerabilities": [
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          "title": "Vulnerability description"
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        {
          "category": "summary",
          "text": "pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw in pyasn1, rated as Important, could lead to a denial of service in Red Hat products that process untrusted ASN.1 data. A remote attacker could send a specially crafted BER, CER, or DER encoded REAL value with a large exponent, causing applications to consume excessive resources during decoding operations such as printing, logging, or arithmetic, thereby rendering the service unavailable.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-59886"
        },
        {
          "category": "external",
          "summary": "RHBZ#2500041",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500041"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-59886",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-59886"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-59886",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59886"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886",
          "url": "https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4",
          "url": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4"
        },
        {
          "category": "external",
          "summary": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r",
          "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r"
        }
      ],
      "release_date": "2026-07-14T16:38:29.691000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-24T06:33:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
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            "HighAvailability-8.4.0.Z.AUS:resource-agents-aliyun-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.AUS:resource-agents-aliyun-debuginfo-0:4.1.1-90.el8_4.27.x86_64",
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            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-0:4.1.1-90.el8_4.27.x86_64",
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            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-debuginfo-0:4.1.1-90.el8_4.27.x86_64",
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            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-gcp-0:4.1.1-90.el8_4.27.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:58820"
        },
        {
          "category": "workaround",
          "details": "When processing untrusted ASN.1 data with pyasn1, avoid calling prettyPrint(), str(), float(), int(), or performing comparisons or arithmetic on decoded Real (ASN.1 REAL type) objects. Instead, inspect the raw (mantissa, base, exponent) tuple directly. Where logging decoded ASN.1 structures is necessary, filter out or sanitize Real-typed values before conversion.",
          "product_ids": [
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        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-aliyun-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-aliyun-debuginfo-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-debuginfo-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-debugsource-0:4.1.1-90.el8_4.27.x86_64",
            "HighAvailability-8.4.0.Z.EUS.EXTENSION:resource-agents-gcp-0:4.1.1-90.el8_4.27.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "pyasn1: pyasn1: Denial of Service via crafted ASN.1 REAL values"
    }
  ]
}

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

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-59886",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-15T15:43:46.620953Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-15T15:44:02.717Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pyasn1",
          "vendor": "pyasn1",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.6.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T16:38:29.691Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pyasn1/pyasn1/security/advisories/GHSA-hm4w-wwcw-mr6r"
        },
        {
          "name": "https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886",
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          ],
          "url": "https://github.com/pyasn1/pyasn1/commit/e60c691cb91addb8fcefa2f537e85ede6fb1e886"
        },
        {
          "name": "https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4",
          "tags": [
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          "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

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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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