CVE-2026-32288 (GCVE-0-2026-32288)

Vulnerability from cvelistv5 – Published: 2026-04-08 01:06 – Updated: 2026-04-13 18:20
VLAI
Title
Unbounded allocation for old GNU sparse in archive/tar
Summary
tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
Go
References
Impacted products
Vendor Product Version
Go standard library archive/tar Affected: 0 , < 1.25.9 (semver)
Affected: 1.26.0-0 , < 1.26.2 (semver)
Create a notification for this product.
Credits
Colin Walters (walters@verbum.org) Uuganbayar Lkhamsuren (https://github.com/uug4na) Jakub Ciolek
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-32288",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-13T17:51:05.649111Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-13T18:20:08.191Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "archive/tar",
          "product": "archive/tar",
          "programRoutines": [
            {
              "name": "Reader.readOldGNUSparseMap"
            },
            {
              "name": "readGNUSparseMap1x0"
            },
            {
              "name": "Reader.Next"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.2",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Colin Walters (walters@verbum.org)"
        },
        {
          "lang": "en",
          "value": "Uuganbayar Lkhamsuren (https://github.com/uug4na)"
        },
        {
          "lang": "en",
          "value": "Jakub Ciolek"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the \"old GNU sparse map\" format."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-08T01:06:57.416Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/763766"
        },
        {
          "url": "https://go.dev/issue/78301"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-4869"
        }
      ],
      "title": "Unbounded allocation for old GNU sparse in archive/tar"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-32288",
    "datePublished": "2026-04-08T01:06:57.416Z",
    "dateReserved": "2026-03-11T16:38:46.557Z",
    "dateUpdated": "2026-04-13T18:20:08.191Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-32288",
      "date": "2026-08-09",
      "epss": "0.0029",
      "percentile": "0.21184"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-23T14:42:56.000Z",
      "cve": "CVE-2026-32288",
      "id": "msrc_CVE-2026-32288",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "product_status:fixed": "8",
      "product_status:known_affected": "19",
      "product_status:known_not_affected": "10",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Unbounded allocation for old GNU sparse in archive/tar",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-32288.json",
      "version": "9"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-32288\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-04-08T02:16:03.707\",\"lastModified\":\"2026-07-25T10:10:00.167\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the \\\"old GNU sparse map\\\" format.\"},{\"lang\":\"es\",\"value\":\"tar.Reader puede asignar una cantidad ilimitada de memoria al leer un archivo creado maliciosamente que contiene un gran n\u00famero de regiones dispersas codificadas en el formato \u0027old GNU sparse map\u0027.\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"Go standard library\",\"product\":\"archive/tar\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"archive/tar\",\"programRoutines\":[{\"name\":\"Reader.readOldGNUSparseMap\"},{\"name\":\"readGNUSparseMap1x0\"},{\"name\":\"Reader.Next\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.25.9\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"1.26.0-0\",\"lessThan\":\"1.26.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-04-13T17:51:05.649111Z\",\"id\":\"CVE-2026-32288\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.25.9\",\"matchCriteriaId\":\"C6C9C072-9817-402D-877F-F83584B07017\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.26.0\",\"versionEndExcluding\":\"1.26.2\",\"matchCriteriaId\":\"39FE9BAF-55E9-43AA-B14E-239E7EF1D65D\"}]}]}],\"references\":[{\"url\":\"https://go.dev/cl/763766\",\"source\":\"security@golang.org\",\"tags\":[\"Patch\"]},{\"url\":\"https://go.dev/issue/78301\",\"source\":\"security@golang.org\",\"tags\":[\"Issue Tracking\"]},{\"url\":\"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU\",\"source\":\"security@golang.org\",\"tags\":[\"Mailing List\",\"Release Notes\"]},{\"url\":\"https://pkg.go.dev/vuln/GO-2026-4869\",\"source\":\"security@golang.org\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:17:19+00:00",
      "cve": "CVE-2026-32288",
      "id": "CVE-2026-32288",
      "initial_release_date": "2026-04-08T01:06:57.416000+00:00",
      "product_status:fixed": "8",
      "product_status:known_affected": "259",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "archive/tar: golang: Go\u0027s archive/tar package: Denial of Service via maliciously-crafted archive",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32288.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-31T16:44:26Z",
      "cve": "CVE-2026-32288",
      "id": "CVE-2026-32288",
      "initial_release_date": "2026-04-08T23:25:47Z",
      "product_status:known_affected": "72",
      "product_status:known_not_affected": "47",
      "product_status:recommended": "206",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-32288",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-32288.json",
      "version": "11"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.5, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-32288\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-04-13T17:51:05.649111Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-04-13T17:51:02.647Z\"}}], \"cna\": {\"title\": \"Unbounded allocation for old GNU sparse in archive/tar\", \"credits\": [{\"lang\": \"en\", \"value\": \"Colin Walters (walters@verbum.org)\"}, {\"lang\": \"en\", \"value\": \"Uuganbayar Lkhamsuren (https://github.com/uug4na)\"}, {\"lang\": \"en\", \"value\": \"Jakub Ciolek\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"archive/tar\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.25.9\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.26.0-0\", \"lessThan\": \"1.26.2\", \"versionType\": \"semver\"}], \"packageName\": \"archive/tar\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Reader.readOldGNUSparseMap\"}, {\"name\": \"readGNUSparseMap1x0\"}, {\"name\": \"Reader.Next\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/763766\"}, {\"url\": \"https://go.dev/issue/78301\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4869\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the \\\"old GNU sparse map\\\" format.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-400: Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-04-08T01:06:57.416Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-32288\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-13T18:20:08.191Z\", \"dateReserved\": \"2026-03-11T16:38:46.557Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-04-08T01:06:57.416Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.