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  4. CVE 2026 104436 zebra before 450 cpu amplification via uncapped
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-104436

Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length

Answer in brief

CVE-2026-104436 records a Medium severity (CVSS 6.3) vulnerability in Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length. The current sources do not mark it as known exploited. The current feed maps ZcashFoundation/zebra (generic), 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
2 mapped packages or products
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), ZcashFoundation/zebra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
ZcashFoundation/zebrageneric>=0 <4.5.04.5.0
ZcashFoundation/zebrageneric>=0 <8.0.08.0.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for ZcashFoundation/zebra, ZcashFoundation/zebra.
  2. 2Review the reported fix. Update ZcashFoundation/zebra to 4.5.0; ZcashFoundation/zebra to 8.0.0 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 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache Thrift: Java TSaslTransport post-auth data-frame missing size limitAlso CWE-770
  • Apache Thrift: Unauthenticated single-packet crash of Go Thrift servers via the THeader transform countAlso CWE-770
  • Apache Thrift: C++ THeaderTransport does not enforce configured maxFrameSizeAlso CWE-770
  • Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: TJSONProtocol accepts a single JSON string/number exceeding the configured size limit (multi-language)Also CWE-770
  • Apache Thrift: Buffered transport reads are not accounted against MaxMessageSizeAlso CWE-770
  • Apache Thrift: C++ THttpTransport grows its line buffer without boundAlso CWE-770

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Oct 2, 2026
References
2 linked sources
Open source record