{"id":"CVE-2026-44498","state":"PUBLISHED","title":"ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops","description":"ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.","publishedAt":"2026-05-08T15:09:09.919Z","updatedAt":"2026-05-14T21:32:52.062Z","severity":{"score":9.2,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["ZcashFoundation zebra"],"affected":[{"vendor":"ZcashFoundation","product":"zebra","versions":[{"version":"< 4.4.0","status":"affected"}]}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc","https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/44xxx/CVE-2026-44498.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-44498","state":"PUBLISHED","datePublished":"2026-05-08T15:09:09.919Z","dateUpdated":"2026-05-14T21:32:52.062Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-06T18:28:20.886Z"},"containers":{"cna":{"title":"ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops","descriptions":[{"lang":"en","value":"ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0."}],"affected":[{"vendor":"ZcashFoundation","product":"zebra","versions":[{"version":"< 4.4.0","status":"affected"}]}],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc","name":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0","name":"https://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":9.2,"baseSeverity":"CRITICAL","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","description":"CWE-682: Incorrect Calculation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-08T15:09:09.919Z"},"source":{"advisory":"GHSA-jv4h-j224-23cc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T16:11:06.609059Z","id":"CVE-2026-44498","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-14T21:32:52.062Z"}}]}}}