CVE-2026-104426

Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check

State: Published
Severity: 8.2 High
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Oct 2, 2026

Description

Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaining_transaction_value that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactions in one block, stalling every validating node for over 52 seconds.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
zebraZcashFoundation	before 6.1.0Affected 6.1.0Not affected

References

GitHub Security Advisory (GHSA-4g24-549m-hp75)vendor-advisory
VulnCheck Advisory: Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Checkthird-party-advisory

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