{"id":"CVE-2026-27710","state":"PUBLISHED","title":"NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)","description":"NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0, a denial-of-service vulnerability exists in NanaZip’s `.NET Single File Application` parser. A crafted bundle can force an integer underflow in header-size calculation and trigger an unbounded memory allocation attempt during archive open. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue.","publishedAt":"2026-02-25T23:43:28.219Z","updatedAt":"2026-02-26T15:48:29.934Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["M2Team NanaZip"],"affected":[{"vendor":"M2Team","product":"NanaZip","versions":[{"version":">= 5.0.1252.0, < 6.0.1638.0","status":"affected"},{"version":">= 6.1, < 6.5.1638.0","status":"affected"}]}],"references":["https://github.com/M2Team/NanaZip/security/advisories/GHSA-89qw-8p49-32wf"],"weaknesses":["CWE-191"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/27xxx/CVE-2026-27710.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27710","state":"PUBLISHED","datePublished":"2026-02-25T23:43:28.219Z","dateUpdated":"2026-02-26T15:48:29.934Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-02-23T17:56:51.203Z"},"containers":{"cna":{"title":"NanaZip .NET Single-File Parser Integer Underflow Leads to Unbounded Allocation (DoS)","descriptions":[{"lang":"en","value":"NanaZip is an open source file archive. Starting in version 5.0.1252.0 and prior to versions 6.0.1638.0 and 6.5.1638.0, a denial-of-service vulnerability exists in NanaZip’s `.NET Single File Application` parser. A crafted bundle can force an integer underflow in header-size calculation and trigger an unbounded memory allocation attempt during archive open. Versions 6.0.1638.0 and 6.5.1638.0 fix the issue."}],"affected":[{"vendor":"M2Team","product":"NanaZip","versions":[{"version":">= 5.0.1252.0, < 6.0.1638.0","status":"affected"},{"version":">= 6.1, < 6.5.1638.0","status":"affected"}]}],"references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-89qw-8p49-32wf","name":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-89qw-8p49-32wf","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV4_0":{"attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-191","lang":"en","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-02-25T23:43:28.219Z"},"source":{"advisory":"GHSA-89qw-8p49-32wf","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/M2Team/NanaZip/security/advisories/GHSA-89qw-8p49-32wf","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-26T15:48:25.870588Z","id":"CVE-2026-27710","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-26T15:48:29.934Z"}}]}}}