Vulnerability-Lookup

RHSA-2026:70191

Vulnerability from csaf_opensuse - Published: 2026-09-23 03:21 - Updated: 2026-09-24 06:12

Summary

Red Hat Security Advisory: runc security update

Severity

Important

Notes

Topic: An update for runc 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: The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime. Security Fix(es): * net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860) 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-2026-56860

A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.

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 13 products

Product	Version	Remediation
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-4:1.4.2-3.el9_8.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-4:1.4.2-3.el9_8.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-4:1.4.2-3.el9_8.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-4:1.4.2-3.el9_8.src	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-4:1.4.2-3.el9_8.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debuginfo-4:1.4.2-3.el9_8.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debuginfo-4:1.4.2-3.el9_8.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debuginfo-4:1.4.2-3.el9_8.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debuginfo-4:1.4.2-3.el9_8.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.x86_64	—	Vendor Fix fix

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:70191	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2515820	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-56860	self
https://bugzilla.redhat.com/show_bug.cgi?id=2515820	external
https://www.cve.org/CVERecord?id=CVE-2026-56860	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56860	external
https://go.dev/cl/803681	external
https://go.dev/issue/80494	external
https://groups.google.com/g/golang-announce/c/94p…	external
https://pkg.go.dev/vuln/GO-2026-6218	external

JSON

To clipboard

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        "relates_to_product_reference": "AppStream-9.8.0.Z.MAIN.EUS"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-56860",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-08-13T22:13:18.319384+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2515820"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory (\u0027..\u0027) segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service flaw in the Go `net/url` package. Applications built with Go that process untrusted URLs containing parent directory segments (\u0027..\u0027) may be vulnerable to excessive resource consumption due to quadratic time complexity in path resolution. This can lead to a denial of service, impacting the availability of affected services.",
          "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": {
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          "AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.x86_64"
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56860"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515820",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515820"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56860",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56860"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56860",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56860"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/803681",
          "url": "https://go.dev/cl/803681"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80494",
          "url": "https://go.dev/issue/80494"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6218",
          "url": "https://pkg.go.dev/vuln/GO-2026-6218"
        }
      ],
      "release_date": "2026-08-13T21:58:53.731000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-23T03:21:00+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",
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          ],
          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:70191"
        }
      ],
      "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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            "AppStream-9.8.0.Z.MAIN.EUS:runc-debugsource-4:1.4.2-3.el9_8.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution"
    }
  ]
}

CVE-2026-56860 (GCVE-0-2026-56860)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 16:14

Title

Avoid quadratic complexity in resolvePath in net/url

Summary

Previously, resolving relative paths containing parent directory ('..') segments performed string conversions and buffer rewrites on each step, resulting in quadratic time complexity and high memory allocation overhead. Now, path resolution operates on a byte buffer using index-based backtracking for '..' segments, eliminating the quadratic time complexity and significantly reducing memory allocations.

Severity

5.9 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 16:14 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

Go Google root

References

4 references

URL	Tags
https://go.dev/cl/803681
https://go.dev/issue/80494
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6218

Impacted products

1 product

Vendor	Product	Version
Go standard library	net/url	Affected: 0 , < 1.25.13 (semver) Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 5.9,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56860",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T16:14:34.601382Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-407",
                "description": "CWE-407 Inefficient Algorithmic Complexity",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T16:14:39.166Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "net/url",
          "product": "net/url",
          "programRoutines": [
            {
              "name": "resolvePath"
            },
            {
              "name": "URL.Parse"
            },
            {
              "name": "URL.ResolveReference"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.13",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.6",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            },
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              "versionType": "semver"
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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
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      "providerMetadata": {
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        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
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      ],
      "title": "Avoid quadratic complexity in resolvePath in net/url"
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  "cveMetadata": {
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    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T16:14:39.166Z",
    "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.

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.

Action not permitted

RHSA-2026:70191

CVE-2026-56860 (GCVE-0-2026-56860)

Tags

Sightings

Nomenclature

Related by attack behaviour