CVE-2026-52739

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: 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 malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/non_finalized_state/chain.rs, Chain::push originally inserted the transaction hash into tx_loc_by_hash and asserted uniqueness before updating shielded data and running the duplicate Sprout, Sapling, or Orchard nullifier checks. The repeated transaction therefore reached the transactions must be unique within a single chain assertion before contextual validation could reject it cleanly. Zebra release builds use panic equals abort, so the reachable assertion terminates the entire process; exploitation requires either two consecutive attacker-mined blocks or an attacker-mined child immediately after an honest block includes the attacker's shielded transaction. This issue is fixed in version 4.5.0.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

July 2, 2026

Last Modified

August 19, 2026

Advisory Details (3)

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

Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier Rejection · Advisory · ZcashFoundation/zebra · GitHub

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-hhm7-qrv5-h4r6
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

Vendor Advisories for CVE-2026-52739(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 / 13× 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 21:44 UTCEG score recompute
  3. 2026-08-23 21:02 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
  5. 2026-08-22 20:36 UTCEG score recompute
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 20:11 UTCEG score recompute
  8. 2026-08-20 22:55 UTCEPSS rescore
  9. 2026-08-19 19:21 UTCEG score recompute
  10. 2026-08-19 18:23 UTCEG score recompute
  11. 2026-08-19 17:04 UTCEPSS rescore
  12. 2026-08-18 20:25 UTCEG score recompute
  13. 2026-07-30 19:13 UTCEG score recompute
  14. 2026-07-26 13:03 UTCEG score recompute
  15. 2026-07-23 03:19 UTCEG score recompute
  16. 2026-07-02 20:07 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-52739?
CVE-2026-52739 is a medium vulnerability published on July 2, 2026. ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a malicious block producer can terminate zebrad by placing the same shielded transaction in a non-finalized parent block and its child. In zebra-state/src/service/nonfinalizedstate/chain.rs, Chain::push originally inserted the…
When was CVE-2026-52739 disclosed?
CVE-2026-52739 was first published in the National Vulnerability Database on July 2, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-52739 actively exploited?
CVE-2026-52739 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 67.8% of all scored CVEs.
What is the CVSS score of CVE-2026-52739?
CVE-2026-52739 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-52739?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52739, 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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