Vulnerability-Lookup

RLSA-2026:65534 (CVE-2026-32280)

Vulnerability from osv_rocky – Published: 2026-09-09 18:08 – Updated: 2026-09-23 18:11 – Source website

Summary

Important: image-builder security update

Details

A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood.

Security Fix(es):

crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)
crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)
crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)
net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)
net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)
golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)

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.

Severity

8.8 (High)


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

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:65534	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2515820	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515827	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2484204	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2456339	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515838	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2456335	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515840	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2467820	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2456333	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2480756	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2467809	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2467822	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515815	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515839	REPORT
	https://access.redhat.com/errata/RHSA-2026:65534	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "image-builder",
        "purl": "pkg:rpm/rocky-linux/image-builder?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:52.1-1.el10_2.2.rocky.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:65534"
  },
  "details": "A local binary for building customized OS artifacts such as VM images and OSTree commits. Uses osbuild under the hood.\n\nSecurity Fix(es):\n\n* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)\n\n* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)\n\n* crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)\n\n* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)\n\n* net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)\n\n* net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)\n\n* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)\n\n* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)\n\n* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)\n\n* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)\n\n* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)\n\n* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)\n\n* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)\n\n* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)\n\nFor 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.",
  "id": "RLSA-2026:65534",
  "modified": "2026-09-23T18:11:13.956891Z",
  "published": "2026-09-09T18:08:44.206459Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:65534"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515820"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515827"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484204"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456339"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515838"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456335"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515840"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467820"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456333"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480756"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467809"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467822"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515815"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:65534"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: image-builder security update",
  "upstream": [
    "CVE-2026-32280",
    "CVE-2026-32281",
    "CVE-2026-33810",
    "CVE-2026-33811",
    "CVE-2026-33818",
    "CVE-2026-39820",
    "CVE-2026-39821",
    "CVE-2026-42499",
    "CVE-2026-42504",
    "CVE-2026-56853",
    "CVE-2026-56858",
    "CVE-2026-56859",
    "CVE-2026-56860",
    "CVE-2026-56862"
  ]
}

CVE-2026-56858 (GCVE-0-2026-56858)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 15:32

Title

Fix Javascript regexp context tracking in html/template

Summary

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 15:31 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Go Google root Scorecard

References

4 references

URL	Tags
https://go.dev/issue/80435
https://go.dev/cl/807100
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6091

Impacted products

1 product

Vendor	Product	Version
Go standard library	html/template	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)

Credits

Ali Sherif

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56858",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T15:31:30.140536Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T15:32:29.852Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "html/template",
          "product": "html/template",
          "programRoutines": [
            {
              "name": "tJS"
            },
            {
              "name": "Template.Execute"
            },
            {
              "name": "Template.ExecuteTemplate"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.13",
              "status": "affected",
              "version": "0",
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              "status": "affected",
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            },
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              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Ali Sherif"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Previously, pathological inputs could close an unescaped \u0027/\u0027 early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T21:58:53.354Z",
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          "url": "https://go.dev/issue/80435"
        },
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          "url": "https://go.dev/cl/807100"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6091"
        }
      ],
      "title": "Fix Javascript regexp context tracking in html/template"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Go",
    "cveId": "CVE-2026-56858",
    "datePublished": "2026-08-13T21:58:53.354Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T15:32:29.852Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-56859 (GCVE-0-2026-56859)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 15:21

Title

Add recursion depth guard during decode in encoding/xml

Summary

Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

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 2026-08-14 15:21 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

Go Google root Scorecard

References

4 references

URL	Tags
https://go.dev/issue/80481
https://go.dev/cl/803320
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6088

Impacted products

1 product

Vendor	Product	Version
Go standard library	encoding/xml	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": "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56859",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T15:21:09.615961Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-770",
                "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T15:21:46.218Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "encoding/xml",
          "product": "encoding/xml",
          "programRoutines": [
            {
              "name": "Decoder.push"
            },
            {
              "name": "Decoder.pop"
            },
            {
              "name": "Decoder.RawToken"
            },
            {
              "name": "Decoder.unmarshalPath"
            },
            {
              "name": "Decoder.unmarshal"
            },
            {
              "name": "Decoder.Decode"
            },
            {
              "name": "Decoder.DecodeElement"
            },
            {
              "name": "Decoder.Skip"
            },
            {
              "name": "Decoder.Token"
            },
            {
              "name": "Unmarshal"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.13",
              "status": "affected",
              "version": "0",
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            },
            {
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              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T21:58:52.959Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
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          "url": "https://go.dev/issue/80481"
        },
        {
          "url": "https://go.dev/cl/803320"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6088"
        }
      ],
      "title": "Add recursion depth guard during decode in encoding/xml"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-56859",
    "datePublished": "2026-08-13T21:58:52.959Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T15:21:46.218Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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 Scorecard

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"
            },
            {
              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Previously, resolving relative paths containing parent directory (\u0027..\u0027) 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 \u0027..\u0027 segments, eliminating the quadratic time complexity and significantly reducing memory allocations."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T21:58:53.731Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/803681"
        },
        {
          "url": "https://go.dev/issue/80494"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6218"
        }
      ],
      "title": "Avoid quadratic complexity in resolvePath in net/url"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
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    "datePublished": "2026-08-13T21:58:53.731Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T16:14:39.166Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-56862 (GCVE-0-2026-56862)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 15:29

Title

Limit handshake messages we are willing to accept post-handshake in crypto/tls

Summary

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.

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 2026-08-14 15:27 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

Go Google root Scorecard

References

4 references

URL	Tags
https://go.dev/issue/80528
https://go.dev/cl/804261
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6090

Impacted products

1 product

Vendor	Product	Version
Go standard library	crypto/tls	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)

Credits

Qi Deng of Aurascape.ai

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56862",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T15:27:34.651997Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
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                "type": "CWE"
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T15:29:41.741Z",
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    "cna": {
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        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
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          "product": "crypto/tls",
          "programRoutines": [
            {
              "name": "Conn.readRecordOrCCS"
            },
            {
              "name": "Conn.Handshake"
            },
            {
              "name": "Conn.HandshakeContext"
            },
            {
              "name": "Conn.Read"
            },
            {
              "name": "Conn.Write"
            },
            {
              "name": "Dial"
            },
            {
              "name": "DialWithDialer"
            },
            {
              "name": "Dialer.Dial"
            },
            {
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      "title": "Limit handshake messages we are willing to accept post-handshake in crypto/tls"
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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.

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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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CVE-2026-56859 (GCVE-0-2026-56859)

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

CVE-2026-56862 (GCVE-0-2026-56862)

Tags

Sightings

Nomenclature

Related by attack behaviour