# CVE-2026-52733

## Summary

- **CVE ID:** CVE-2026-52733
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L)
- **CWE:** CWE-459, CWE-672
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 19, 2026

## Description

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, a natural or attacker-influenced chain fork can leave stale Sapling and Orchard note-commitment subtree roots in Zebra state. In zebra-state/src/service/non_finalized_state/chain.rs, Chain::pop_tip removed a reverted tip block but did not remove subtree entries whose end_height belonged to that block, unlike the cleanup performed by pop_root. When the winning fork later finalized, the abandoned branch's stale subtree data could be written to RocksDB and survive node restarts. The corrupted history can cause z_getsubtreesbyindex consumers such as lightwalletd and light wallets to receive incorrect subtree roots, producing wallet synchronization failures or incorrect wallet state and requiring a full state rebuild for recovery. This issue is fixed in version 4.5.0.

## Affected Products

- ZcashFoundation — zebra (< 4.5.0)
- ZcashFoundation — zebra-state (< 7.0.0)

## References

- [CNA](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-2gf8-q9rr-jq3h)
- [CNA](https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd)
- [CNA](https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.34%
- **EPSS Percentile:** 26.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._