Vulnerability-Lookup

OESA-2026-2786 (CVE-2026-42250)

Vulnerability from osv_openeuler – Published: 2026-06-24 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

bzip2 security update

Details

bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.

Security Fix(es):

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(CVE-2026-42250)

Severity

4.8 (Medium)


                    
                      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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-42250	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bzip2-1.0.8-9.oe2403sp1.aarch64.rpm",
          "bzip2-debuginfo-1.0.8-9.oe2403sp1.aarch64.rpm",
          "bzip2-debugsource-1.0.8-9.oe2403sp1.aarch64.rpm",
          "bzip2-devel-1.0.8-9.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "bzip2-help-1.0.8-9.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "bzip2-1.0.8-9.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "bzip2-1.0.8-9.oe2403sp1.x86_64.rpm",
          "bzip2-debuginfo-1.0.8-9.oe2403sp1.x86_64.rpm",
          "bzip2-debugsource-1.0.8-9.oe2403sp1.x86_64.rpm",
          "bzip2-devel-1.0.8-9.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "bzip2",
        "purl": "pkg:rpm/openEuler/bzip2\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.8-9.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "bzip2-1.0.8-9.oe2403sp3.aarch64.rpm",
          "bzip2-debuginfo-1.0.8-9.oe2403sp3.aarch64.rpm",
          "bzip2-debugsource-1.0.8-9.oe2403sp3.aarch64.rpm",
          "bzip2-devel-1.0.8-9.oe2403sp3.aarch64.rpm"
        ],
        "noarch": [
          "bzip2-help-1.0.8-9.oe2403sp3.noarch.rpm"
        ],
        "src": [
          "bzip2-1.0.8-9.oe2403sp3.src.rpm"
        ],
        "x86_64": [
          "bzip2-1.0.8-9.oe2403sp3.x86_64.rpm",
          "bzip2-debuginfo-1.0.8-9.oe2403sp3.x86_64.rpm",
          "bzip2-debugsource-1.0.8-9.oe2403sp3.x86_64.rpm",
          "bzip2-devel-1.0.8-9.oe2403sp3.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP3",
        "name": "bzip2",
        "purl": "pkg:rpm/openEuler/bzip2\u0026distro=openEuler-24.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.8-9.oe2403sp3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "bzip2-1.0.8-7.oe2003sp4.aarch64.rpm",
          "bzip2-debuginfo-1.0.8-7.oe2003sp4.aarch64.rpm",
          "bzip2-debugsource-1.0.8-7.oe2003sp4.aarch64.rpm",
          "bzip2-devel-1.0.8-7.oe2003sp4.aarch64.rpm"
        ],
        "noarch": [
          "bzip2-help-1.0.8-7.oe2003sp4.noarch.rpm"
        ],
        "src": [
          "bzip2-1.0.8-7.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "bzip2-1.0.8-7.oe2003sp4.x86_64.rpm",
          "bzip2-debuginfo-1.0.8-7.oe2003sp4.x86_64.rpm",
          "bzip2-debugsource-1.0.8-7.oe2003sp4.x86_64.rpm",
          "bzip2-devel-1.0.8-7.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "bzip2",
        "purl": "pkg:rpm/openEuler/bzip2\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.8-7.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "bzip2-1.0.8-7.oe2203sp4.aarch64.rpm",
          "bzip2-debuginfo-1.0.8-7.oe2203sp4.aarch64.rpm",
          "bzip2-debugsource-1.0.8-7.oe2203sp4.aarch64.rpm",
          "bzip2-devel-1.0.8-7.oe2203sp4.aarch64.rpm"
        ],
        "noarch": [
          "bzip2-help-1.0.8-7.oe2203sp4.noarch.rpm"
        ],
        "src": [
          "bzip2-1.0.8-7.oe2203sp4.src.rpm"
        ],
        "x86_64": [
          "bzip2-1.0.8-7.oe2203sp4.x86_64.rpm",
          "bzip2-debuginfo-1.0.8-7.oe2203sp4.x86_64.rpm",
          "bzip2-debugsource-1.0.8-7.oe2203sp4.x86_64.rpm",
          "bzip2-devel-1.0.8-7.oe2203sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP4",
        "name": "bzip2",
        "purl": "pkg:rpm/openEuler/bzip2\u0026distro=openEuler-22.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.8-7.oe2203sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "bzip2 is a freely available, patent free, high-quality data compressor. It typically compresses files to within 10% to 15% of the best available techniques (the PPM family of statistical compressors), whilst being around twice as fast at compression and six times faster at decompression.\r\n\r\nSecurity Fix(es):\n\nbzip2 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(CVE-2026-42250)",
  "id": "OESA-2026-2786",
  "modified": "2026-08-06T11:11:42Z",
  "published": "2026-06-24T11:11:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2786"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42250"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "bzip2 security update",
  "upstream": [
    "CVE-2026-42250"
  ]
}

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

Title

Off-by-One Leading to Out-of-Bounds Write in bzip2

Summary

Severity

4.8 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 14:22 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

CERT-PL ENISA root

References

4 references

URL	Tags
https://cert.pl/en/posts/2026/05/CVE-2026-42250/	third-party-advisory
https://sourceware.org/bzip2/	product
https://inbox.sourceware.org/bzip2-devel/20260528…	vendor-advisory
https://sourceware.org/cgit/bzip2/commit/?id=35d1…	patch

Impacted products

1 product

Vendor	Product	Version
bzip2	bzip2	Affected: 0 , ≤ 1.0.8 (semver) Unaffected: 35d122a3df8b0cc4082a4d89fdc6ee99f375fe67 (custom)

Credits

Michał Majchrowicz (AFINE Team) Marcin Wyczechowski (AFINE Team)

Show details on NVD website

JSON

To clipboard

{
  "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"
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      "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"
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          "url": "https://sourceware.org/cgit/bzip2/commit/?id=35d122a3df8b0cc4082a4d89fdc6ee99f375fe67"
        }
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      "source": {
        "discovery": "EXTERNAL"
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      "tags": [
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  "cveMetadata": {
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    "assignerShortName": "CERT-PL",
    "cveId": "CVE-2026-42250",
    "datePublished": "2026-05-28T13:15:19.660Z",
    "dateReserved": "2026-04-25T11:31:56.229Z",
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    "state": "PUBLISHED"
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  "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

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OESA-2026-2786 (CVE-2026-42250)

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

Tags

Sightings

Nomenclature

Related by attack behaviour