# Zcash Foundation Zebra vulnerabilities Source: https://junglewise.ai/threats/technologies/zebra Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/zebra.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 25 vulnerabilities in Zcash Foundation Zebra: 5 in the last 7 days and 20 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-123560, was published on 8 November 2026. 7 vulnerabilities in the last four weeks, down 36% on the four before (11). ## Counts - Last 7 days: 5 - Last 30 days: 5 - Last 90 days: 20 - All time: 25 (2 critical, 0 exploited in the wild) ## About Zcash Foundation Zebra Zcash node implementation written in Rust. ## Latest Zcash Foundation Zebra vulnerabilities - [CVE-2026-123560: Zebra incomplete cleanup in checkpoint sync stalls initial sync](https://junglewise.ai/threats/cve-2026-123560-zebra-before-7-0-0-contains-an-incomplete-cleanup-vulnerability) (high, CVSS 7.5, published 8 Nov 2026) - [CVE-2026-123559: Zebra denial of service via quadratic sighash computation](https://junglewise.ai/threats/cve-2026-123559-zebra-before-7-0-0-contains-an-inefficient-algorithmic) (high, CVSS 7.5, published 8 Nov 2026) - [CVE-2026-123557: Zcash Foundation Zebra zebrad reachable assertion denial of service](https://junglewise.ai/threats/cve-2026-123557-zcashfoundation-zebra-zebrad-before-7-0-0-contains-a-reachable) (medium, CVSS 5.9, published 8 Nov 2026) - [CVE-2026-123556: Zcash Foundation Zebra protection mechanism failure in mempool lock-time scoring](https://junglewise.ai/threats/cve-2026-123556-zcashfoundation-zebra-from-4-5-0-before-7-0-0-contains-a) (medium, CVSS 5.3, published 8 Nov 2026) - [CVE-2026-123555: Zebra misbehavior scoring bypass via invalid script verification](https://junglewise.ai/threats/cve-2026-123555-zebra-from-2-3-0-before-7-0-0-contains-a-denial-of-service) (high, CVSS 7.5, published 8 Nov 2026) - [CVE-2026-109364: Zebra peer ban bypass via exact IP keying](https://junglewise.ai/threats/cve-2026-109364-zebra-2-3-0-before-6-4-0-contains-a-protection-mechanism-failure) (medium, CVSS 5.3, published 12 Oct 2026) - [CVE-2026-109363: Zcash Foundation Zebra denial of service via malformed v6 transaction](https://junglewise.ai/threats/cve-2026-109363-zcashfoundation-zebra-6-4-0-before-6-4-2-parses-version-6) (high, CVSS 7.5, published 12 Oct 2026) - [CVE-2026-104437: Zebra consensus divergence in V5 transparent signature verification](https://junglewise.ai/threats/cve-2026-104437-zebra-before-4-4-0-contains-a-consensus-divergence-vulnerability) (high, CVSS 7.4, published 2 Oct 2026) - [CVE-2026-104432: Zebra improper condition check causing false readiness status](https://junglewise.ai/threats/cve-2026-104432-zebra-before-6-3-0-contains-an-improper-exceptional-condition) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-104431: Zebra denial of service in mempool transaction verification](https://junglewise.ai/threats/cve-2026-104431-zebra-before-6-0-0-contains-a-denial-of-service-vulnerability) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-104429: Zebra per-peer mempool admission bypass in P2P transaction handling](https://junglewise.ai/threats/cve-2026-104429-zebra-zebrad-5-0-0-before-6-0-0-rc-0-does-not-apply-its-per-peer) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-104428: Zcash Foundation Zebra getblock RPC denial of service](https://junglewise.ai/threats/cve-2026-104428-the-getblock-rpc-method-in-zebra-rpc-before-11-0-0-used-by-the) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-104427: Zebra incomplete cleanup in state write task](https://junglewise.ai/threats/cve-2026-104427-zebra-before-6-1-0-contains-an-incomplete-cleanup-vulnerability) (medium, CVSS 5.9, published 2 Oct 2026) - [CVE-2026-104425: Zcash Foundation Zebra resource exhaustion in Orchard proof verification](https://junglewise.ai/threats/cve-2026-104425-zcashfoundation-zebra-before-6-1-0-contains-a-resource) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-104423: Zebra asymmetric resource consumption in shielded proof verification](https://junglewise.ai/threats/cve-2026-104423-zebra-zebrad-before-6-2-1-contains-an-asymmetric-resource) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-104422: Zebra block sync denial of service via coinbase scriptSig rewrite](https://junglewise.ai/threats/cve-2026-104422-the-block-sync-download-path-in-zebra-zebrad-before-6-3-0-reads) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-104421: Zcash Zebra incomplete cleanup in block download verification](https://junglewise.ai/threats/cve-2026-104421-zebra-before-6-2-1-contains-an-incomplete-cleanup-vulnerability) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-104420: Zebra peer misbehavior scoring bypass in block gossip](https://junglewise.ai/threats/cve-2026-104420-zebra-before-6-3-0-contains-a-protection-mechanism-failure-that) (medium, CVSS 5.3, published 2 Oct 2026) - [CVE-2026-52734: ZcashFoundation zebrad memory leak in mempool download pipeline](https://junglewise.ai/threats/cve-2026-52734-zcashfoundation-zebrad-memory-leak-in-mempool-download-pipeline) (medium, CVSS 5.3, published 18 Aug 2026) - [CVE-2026-52732: ZcashFoundation zebrad denial of service in mempool inbound queue](https://junglewise.ai/threats/cve-2026-52732-zcashfoundation-zebrad-denial-of-service-in-mempool-inbound-queue) (medium, CVSS 5.3, published 18 Aug 2026) - [CVE-2026-54496: Zcash Orchard Action circuit soundness vulnerability in halo2_gadgets](https://junglewise.ai/threats/cve-2026-54496-zcash-orchard-action-circuit-soundness-vulnerability-in-halo2) (critical, CVSS 9.3, published 17 Jul 2026) - [CVE-2026-44499: Zcash Foundation Zebra Denial of Service in block discovery pipeline](https://junglewise.ai/threats/cve-2026-44499-zcash-foundation-zebra-denial-of-service-in-block-discovery) (high, CVSS 4, published 8 May 2026) - [CVE-2026-44500: ZcashFoundation Zebra denial of service via allocation amplification](https://junglewise.ai/threats/cve-2026-44500-zcashfoundation-zebra-denial-of-service-via-allocation) (medium, CVSS 5.3, published 8 May 2026) - [Zcash Zebra consensus divergence in SIGHASH_SINGLE handling](https://junglewise.ai/threats/zcash-zebra-consensus-divergence-in-sighash-single-handling-8969cdaa) (critical, CVSS 9.2, published 7 May 2026) - [CVE-2026-44498: Zcash Zebra consensus failure via sigop undercounting in block validator](https://junglewise.ai/threats/cve-2026-44498-zcash-zebra-consensus-failure-via-sigop-undercounting-in-block) (high, CVSS 7.5, published 7 May 2026) ## Most severe Zcash Foundation Zebra vulnerabilities - [CVE-2026-54496: Zcash Orchard Action circuit soundness vulnerability in halo2_gadgets](https://junglewise.ai/threats/cve-2026-54496-zcash-orchard-action-circuit-soundness-vulnerability-in-halo2) (critical, CVSS 9.3, published 17 Jul 2026) - [Zcash Zebra consensus divergence in SIGHASH_SINGLE handling](https://junglewise.ai/threats/zcash-zebra-consensus-divergence-in-sighash-single-handling-8969cdaa) (critical, CVSS 9.2, published 7 May 2026) - [CVE-2026-109363: Zcash Foundation Zebra denial of service via malformed v6 transaction](https://junglewise.ai/threats/cve-2026-109363-zcashfoundation-zebra-6-4-0-before-6-4-2-parses-version-6) (high, CVSS 7.5, published 12 Oct 2026) - [CVE-2026-44498: Zcash Zebra consensus failure via sigop undercounting in block validator](https://junglewise.ai/threats/cve-2026-44498-zcash-zebra-consensus-failure-via-sigop-undercounting-in-block) (high, CVSS 7.5, published 7 May 2026) - [CVE-2026-104431: Zebra denial of service in mempool transaction verification](https://junglewise.ai/threats/cve-2026-104431-zebra-before-6-0-0-contains-a-denial-of-service-vulnerability) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-104423: Zebra asymmetric resource consumption in shielded proof verification](https://junglewise.ai/threats/cve-2026-104423-zebra-zebrad-before-6-2-1-contains-an-asymmetric-resource) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-104422: Zebra block sync denial of service via coinbase scriptSig rewrite](https://junglewise.ai/threats/cve-2026-104422-the-block-sync-download-path-in-zebra-zebrad-before-6-3-0-reads) (high, CVSS 7.5, published 2 Oct 2026) - [CVE-2026-123560: Zebra incomplete cleanup in checkpoint sync stalls initial sync](https://junglewise.ai/threats/cve-2026-123560-zebra-before-7-0-0-contains-an-incomplete-cleanup-vulnerability) (high, CVSS 7.5, published 8 Nov 2026) - [CVE-2026-123559: Zebra denial of service via quadratic sighash computation](https://junglewise.ai/threats/cve-2026-123559-zebra-before-7-0-0-contains-an-inefficient-algorithmic) (high, CVSS 7.5, published 8 Nov 2026) - [CVE-2026-123555: Zebra misbehavior scoring bypass via invalid script verification](https://junglewise.ai/threats/cve-2026-123555-zebra-from-2-3-0-before-7-0-0-contains-a-denial-of-service) (high, CVSS 7.5, published 8 Nov 2026) ## Vulnerabilities per week 7 vulnerabilities in the last four weeks, down 36% on the four before (11). | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 2 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 0 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 11 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 2 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 5 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Zcash Foundation technologies - [Zcash Foundation Zebrad](https://junglewise.ai/threats/technologies/zcash-foundation-zebrad): 7 vulnerabilities - [Zcash Foundation Zebra-Script](https://junglewise.ai/threats/technologies/zcash-foundation-zebra-script): 3 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Zcash Foundation Zebra vulnerabilities", https://junglewise.ai/threats/technologies/zebra, 12 November 2026.