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  4. CVE 2026 109365 zebra before 640 denial of service via same hash
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-109365

Zebra before 6.4.0 Denial of Service via Same-Hash Forged Block BodiesCVE-2026-109365

Answer in brief

CVE-2026-109365 records a Medium severity (CVSS 6.3) vulnerability in Zebra before 6.4.0 Denial of Service via Same-Hash Forged Block Bodies. 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 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 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 <6.4.06.4.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ZcashFoundation/zebra.
  2. 2Review the reported fix. Update ZcashFoundation/zebra to 6.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 12, 2026

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

  2. Source modified

    Oct 12, 2026

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

  3. First seen by HOL

    Oct 12, 2026

Sources and claim methodology

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

Zebra before 6.4.0 contains an uncontrolled resource consumption vulnerability that allows unauthenticated peers to force full proof verification by serving forged block bodies with valid header hashes. Attackers can flip authorizing-only bytes such as a coinbase scriptSig, wasting Sapling, Orchard, and Ironwood proof verification without penalty and stalling sync for 67 seconds.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 TransactionSame zcashfoundation/zebra package
  • Zebra 2.3.0 before 6.4.0 Peer Ban Bypass via Exact-IP KeyingSame zcashfoundation/zebra package
  • Zebra before 6.4.0 Gossiped Block Drop via Forged Coinbase scriptSig HeightSame zcashfoundation/zebra package
  • WordPress Salevo plugin <= 1.3.0 - Broken Access Control vulnerabilitySame generic ecosystem
  • hex_core decompresses registry and Erlang term API responses without size limitsSame generic ecosystem
  • WordPress Booktics plugin <= 1.0.28 - Broken Access Control vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-345
Source
CVE List V5
Source checked
Oct 12, 2026
References
2 linked sources
Open source record