# CVE-2026-52829

## Summary

- **CVE ID:** CVE-2026-52829
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-617, CWE-843
- **Published:** Aug 18, 2026
- **Last Modified:** Aug 18, 2026

## Description

ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0.

## Affected Products

- ZcashFoundation — zebra (< 4.5.0)

## References

- [CNA](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-63wg-wjjj-7cp8)
- [CNA](https://github.com/ZcashFoundation/zebra/commit/1440b43ca7df59aca948090d45117557b217a6cd)
- [CNA](https://github.com/ZcashFoundation/zebra/releases/tag/v4.5.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.2

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