GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-42250 (GCVE-0-2026-42250)

Vulnerability from cvelistv5 – Published: 2026-05-28 13:15 – Updated: 2026-06-05 07:47 X_Open Source
VLAI
Title
Off-by-One Leading to Out-of-Bounds Write in bzip2
Summary
bzip2 contains an off‑by‑one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out‑of‑bounds write to a global buffer, resulting in memory corruption and a crash (denial of service). This issue was fixed in bzip2 patch 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-28 14:22 UTC
CWE
Impacted products
Vendor Product Version CPE status
bzip2 bzip2 Affected: 0 , ≤ 1.0.8 (semver)
Unaffected: 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67 (custom)
guessed Create a notification for this product.
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42250",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T14:22:49.264231Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T14:23:00.571Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "bzip2",
          "repo": "https://gitlab.com/federicomenaquintero/bzip2",
          "vendor": "bzip2",
          "versions": [
            {
              "lessThanOrEqual": "1.0.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "35d122a3df8b0cc4082a4d89fdc6ee99f375fe67",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Micha\u0142 Majchrowicz (AFINE Team)"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Marcin Wyczechowski (AFINE Team)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "bzip2 contains an off\u2011by\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\u2011of\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).\u003cbr\u003e\u003cbr\u003eThis issue was fixed in bzip2 patch\u0026nbsp;35d122a3df8b0cc4082a4d89fdc6ee99f375fe67"
            }
          ],
          "value": "bzip2 contains an off\u2011by\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\u2011of\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).\n\nThis issue was fixed in bzip2 patch\u00a035d122a3df8b0cc4082a4d89fdc6ee99f375fe67"
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787 Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T07:47:33.397Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
        "shortName": "CERT-PL"
      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/05/CVE-2026-42250/"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://sourceware.org/bzip2/"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Off-by-One Leading to Out-of-Bounds Write in bzip2",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-42250",
    "datePublished": "2026-05-28T13:15:19.660Z",
    "dateReserved": "2026-04-25T11:31:56.229Z",
    "dateUpdated": "2026-06-05T07:47:33.397Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-42250",
      "date": "2026-09-16",
      "epss": "0.00126",
      "percentile": "0.0267"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-28T01:49:07.000Z",
      "cve": "CVE-2026-42250",
      "id": "msrc_CVE-2026-42250",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "4",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Off-by-One Leading to Out-of-Bounds Write in bzip2",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-42250.json",
      "version": "8"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-42250\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2026-05-28T14:16:19.890\",\"lastModified\":\"2026-06-17T10:47:34.687\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"bzip2 contains an off\u2011by\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\u2011of\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).\\n\\nThis issue was fixed in bzip2 patch\u00a035d122a3df8b0cc4082a4d89fdc6ee99f375fe67\"}],\"affected\":[{\"source\":\"cvd@cert.pl\",\"affectedData\":[{\"vendor\":\"bzip2\",\"product\":\"bzip2\",\"defaultStatus\":\"unaffected\",\"repo\":\"https://gitlab.com/federicomenaquintero/bzip2\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"1.0.8\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"35d122a3df8b0cc4082a4d89fdc6ee99f375fe67\",\"versionType\":\"custom\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"PASSIVE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"LOW\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-05-28T14:22:49.264231Z\",\"id\":\"CVE-2026-42250\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-787\"}]}],\"references\":[{\"url\":\"https://cert.pl/en/posts/2026/05/CVE-2026-42250/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://sourceware.org/bzip2/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67\",\"source\":\"cvd@cert.pl\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T12:48:54+00:00",
      "cve": "CVE-2026-42250",
      "id": "CVE-2026-42250",
      "initial_release_date": "2026-05-28T13:15:19.660000+00:00",
      "product_status:fixed": "3",
      "product_status:known_affected": "90",
      "product_status:known_not_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "bzip2: bzip2: Denial of Service in bzip2recover via a specially crafted file",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42250.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:07:38Z",
      "cve": "CVE-2026-42250",
      "id": "CVE-2026-42250",
      "initial_release_date": "2026-05-29T01:21:01Z",
      "product_status:known_affected": "530",
      "product_status:recommended": "67",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-42250",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-42250.json",
      "version": "11"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-42250\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-28T14:22:49.264231Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-28T14:22:56.254Z\"}}], \"cna\": {\"tags\": [\"x_open-source\"], \"title\": \"Off-by-One Leading to Out-of-Bounds Write in bzip2\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Micha\\u0142 Majchrowicz (AFINE Team)\"}, {\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Marcin Wyczechowski (AFINE Team)\"}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 4.8, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://gitlab.com/federicomenaquintero/bzip2\", \"vendor\": \"bzip2\", \"product\": \"bzip2\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"1.0.8\"}, {\"status\": \"unaffected\", \"version\": \"35d122a3df8b0cc4082a4d89fdc6ee99f375fe67\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://cert.pl/en/posts/2026/05/CVE-2026-42250/\", \"tags\": [\"third-party-advisory\"]}, {\"url\": \"https://sourceware.org/bzip2/\", \"tags\": [\"product\"]}, {\"url\": \"https://inbox.sourceware.org/bzip2-devel/20260528145407.293768-1-mark@klomp.org/\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"bzip2 contains an off\\u2011by\\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\\u2011of\\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).\\n\\nThis issue was fixed in bzip2 patch\\u00a035d122a3df8b0cc4082a4d89fdc6ee99f375fe67\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"bzip2 contains an off\\u2011by\\u2011one error in the bzip2recover utility. When processing a specially crafted file, the application performs an out\\u2011of\\u2011bounds write to a global buffer, resulting in memory corruption and a crash (denial of service).\u003cbr\u003e\u003cbr\u003eThis issue was fixed in bzip2 patch\u0026nbsp;35d122a3df8b0cc4082a4d89fdc6ee99f375fe67\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"shortName\": \"CERT-PL\", \"dateUpdated\": \"2026-06-05T07:47:33.397Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-42250\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-05T07:47:33.397Z\", \"dateReserved\": \"2026-04-25T11:31:56.229Z\", \"assignerOrgId\": \"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6\", \"datePublished\": \"2026-05-28T13:15:19.660Z\", \"assignerShortName\": \"CERT-PL\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

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.


Loading…