CVE-2026-52829Network attack vectorHinoki check available

Node crash via address mismatch assertion

Published Aug 18, 2026 · Updated Aug 18, 2026

Denial of service in Zcash Foundation Zebra before 4.5.0 allows remote attackers to crash a node via an invalid mempool transaction. During peer tracking, the handshake stores an IPv4-mapped IPv6 peer as canonical IPv4 through MetaAddr::new_connected, but mempool misbehavior handling forwards the raw transient address to MetaAddrChange::UpdateMisbehavior, so apply_to_meta_addr reaches its address-mismatch assertion. Exploitation requires only an unauthenticated IPv4 connection to the default Linux dual-stack listener on a synced node; after the 30-second misbehavior flush, panic=abort terminates zebrad and the crash can be repeated after restart.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Zcash Foundation Zebra before 4.5.0 allows remote attackers to crash a node via an invalid mempool transaction. During peer tracking, the handshake stores an IPv4-mapped IPv6 peer as canonical IPv4 through MetaAddr::new_connected, but mempool misbehavior handling forwards the raw transient address to MetaAddrChange::UpdateMisbehavior, so apply_to_meta_addr reaches its address-mismatch assertion. Exploitation requires only an unauthenticated IPv4 connection to the default Linux dual-stack listener on a synced node; after the 30-second misbehavior flush, panic=abort terminates zebrad and the crash can be repeated after restart.

The record

CVE
CVE-2026-52829
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Zcash Foundation
Product
Zebra
Classifications
CWE-617, CWE-843, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zcash Foundation · Zebraversion=< 4.5.0

Published CVSS scores

7.5GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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