CVE-2026-104428 (GCVE-0-2026-104428)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-02 11:38
VLAI
Title
Zebra before 11.0.0 Denial of Service via getblock Verbosity 2
Summary
The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation's Zebra node, panics on verbosity 2 for a side-chain block because the block's -1 confirmations sentinel is converted to u32 with .expect(), aborting the process. Remote unauthenticated attackers, directly or through lightwalletd, can repeat this call to keep the node in a crash loop.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: 0 , < 11.0.0 (semver)
Unaffected: 11.0.0 (semver)
    cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-03 00:00
Credits
mpguerra defuse oxarbitrage upbqdn
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:cargo/zebra-rpc",
          "product": "zebra",
          "vendor": "ZcashFoundation",
          "versions": [
            {
              "lessThan": "11.0.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "11.0.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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        },
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        }
      ],
      "datePublic": "2026-07-03T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation\u0027s Zebra node, panics on verbosity 2 for a side-chain block because the block\u0027s -1 confirmations sentinel is converted to u32 with .expect(), aborting the process. Remote unauthenticated attackers, directly or through lightwalletd, can repeat this call to keep the node in a crash loop."
        }
      ],
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            "attackRequirements": "NONE",
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            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "problemTypes": [
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            {
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              "description": "Reachable Assertion",
              "lang": "en",
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      "providerMetadata": {
        "dateUpdated": "2026-10-02T11:38:08.558Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-x6v8-c2xp-928m)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-x6v8-c2xp-928m"
        },
        {
          "name": "VulnCheck Advisory: Zebra before 11.0.0 Denial of Service via getblock Verbosity 2",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/zebra-before-11.0.0-denial-of-service-via-getblock-verbosity-2"
        }
      ],
      "title": "Zebra before 11.0.0 Denial of Service via getblock Verbosity 2",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-104428",
    "datePublished": "2026-10-02T11:38:08.558Z",
    "dateReserved": "2026-10-02T00:46:23.831Z",
    "dateUpdated": "2026-10-02T11:38:08.558Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "epss": "0.00387",
      "percentile": "0.30453"
    }
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}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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