Dashboard / CVE-2026-123555

CVE-2026-123555

HIGH
MEDIUM Priority: 0.04 BB Relevance: 77/100
Published: 2026-11-08 Modified: 2026-11-13 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: None
VC: None
VI: None
VA: High

Description

Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.

Weakness Classification (1)

Affected Software (4)

VendorProductVersion
ZcashFoundation zebra 2.3.0 < 7.0.0
ZcashFoundation zebra 1.0.0-beta.46 < 18.0.0
ZcashFoundation zebra 2.3.0 < 7.0.0
ZcashFoundation zebra 1.0.0-beta.46 < 18.0.0

References & Advisories (3)

Bug Bounty Relevance

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.7 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.43%
Raw Score 0.004320
Percentile 37.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00432
2026-11-12
0.00432
2026-11-10
0.00432
2026-11-09
0.00432
2026-11-08
0.00432

Intelligence Sources

mitre ref →
nvd ref →

External Links