Zebra 4.5.0 before 7.0.0 Honest Peer Ban via Mempool Lock-Time Scoring
- Exploited
- No known exploitation
- Fix
- Fixed in 7.0.0
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 7.0.0.
- Last modified
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.30% · 23rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 24/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
ZcashFoundation Zebra from 4.5.0 before 7.0.0 contains a protection mechanism failure that bans honest peers by scoring mempool lock-time rejections at the ban threshold. Attackers can broadcast transactions locked until the current height right after each block, causing lagging nodes to ban honest relaying peers for 24 hours or until restart.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed per the CVSS vector, reachable over the network without a login · Unknown: No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity6.9/10CVSS 6.9
- No patch0/5No signal
What would change the score
- Would score about 69 if added to CISA KEV
- Would score about 64 if CISA's SSVC rates exploitation active
- Would score about 29 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 7.0.0.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- ZcashFoundation zebra
From 4.5.0 · fixed in 7.0.0
Evidence 2
- Advisory
- Link
Corrections
None so far.
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Questions about CVE-2026-123556
Is CVE-2026-123556 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-123556?
zebra: from 4.5.0 before 7.0.0.Source: cve.now feed data
How do I fix CVE-2026-123556?
Upgrade to a fixed version: 7.0.0.Source: cve.now feed data