CVE-2026-52736

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the attacker to mutate coinbase scriptSig authentication data while retaining the transaction identifiers, merkle root, and block header hash, so the poisoned body fails later commitment validation but shares the canonical hash. In zebra-state/src/service.rs, queue_and_commit_to_non_finalized_state recorded the hash in non_finalized_block_write_sent_hashes before contextual validation completed and did not remove it when the write task rejected the body. When the honest body later arrived, the cached hash caused KnownBlock::WriteChannel duplicate handling to suppress it, leaving the node stuck one height behind until restart or reorganization. This issue is fixed in version 4.5.0.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity87% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

July 2, 2026

Last Modified

August 18, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

Zebra 4.5.0

Patch available: ZcashFoundation/zebra v4.5.0

https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0
github_commit Patch Available

commit 1440b43ca7df (ZcashFoundation/zebra)

Patch available: ZcashFoundation/zebra v4.5.0 (contains commit 1440b43ca7df)

https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd
github Patch Available

Block suppression via NU5 same-header body poisoning of sent-hash cache · Advisory · ZcashFoundation/zebra · GitHub

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4m69-67m6-prqp

Vendor Advisories for CVE-2026-52736(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
crates.io(2)
PackageVulnerable rangeFixed inDependents
zebrad—4.5.0—
zebra-state—7.0.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 15× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-25 13:49 UTCEPSS rescore
  2. 2026-08-24 22:37 UTCEG score recompute
  3. 2026-08-24 10:16 UTCEG score recompute
  4. 2026-08-23 07:45 UTCEG score recompute
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-22 06:26 UTCEG score recompute
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-21 04:44 UTCEG score recompute
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-20 04:02 UTCEG score recompute
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 20:25 UTCEG score recompute
  13. 2026-08-18 19:29 UTCEG score recompute▲ 8.70
  14. 2026-08-18 19:29 UTCMITRE cvelistV5CVSS v3 → 8.7 · CVSS v4 → 8.7
  15. 2026-08-02 00:43 UTCEG score recompute
  16. 2026-07-26 13:03 UTCEG score recompute
  17. 2026-07-23 03:19 UTCEG score recompute
  18. 2026-07-02 20:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-52736?
CVE-2026-52736 is a high vulnerability published on July 2, 2026. ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a remote unauthenticated P2P peer can stall a Zebra node by racing an invalid block body against the valid canonical body for the same block header hash. ZIP-244 permits the attacker to mutate coinbase scriptSig authentication data…
When was CVE-2026-52736 disclosed?
CVE-2026-52736 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52736 actively exploited?
CVE-2026-52736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 63.2% of all scored CVEs.
What is the CVSS score of CVE-2026-52736?
CVE-2026-52736 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-52736?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52736, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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