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  4. CVE 2026 104424 zebra before 610 incorrect block size calculation
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-104424

Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate

Answer in brief

CVE-2026-104424 records a Medium severity (CVSS 6.3) vulnerability in Zebra before 6.1.0 Incorrect Block Size Calculation in getblocktemplate. The current sources do not mark it as known exploited. The current feed maps ZcashFoundation/zebra (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ZcashFoundation/zebra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ZcashFoundation/zebrageneric>=0 <6.1.06.1.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ZcashFoundation/zebra.
  2. 2Review the reported fix. Update ZcashFoundation/zebra to 6.1.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Zebra before 6.1.0 contains an incorrect calculation vulnerability in its ZIP-317 block template selector that omits header and transaction-count size from the block budget. Attackers can place valid selectable transactions in a victim miner's mempool to shape templates into oversized blocks, causing rejection and wasted proof-of-work.

Quoted source text, attributed separately from HOL analysis.

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Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-131
Source
CVE List V5
Source checked
Oct 2, 2026
References
2 linked sources
Open source record