GHSA-gq4h-3grw-2rhv: zebra-script (CVE-2026-44497)

Zebra has Consensus Divergence in Transparent Sighash Hash-Type Handling due to Stale Buffer

CVSS 9.3 CriticalCriticalEPSS 0.0019 · 8th percentile

Critical, because:

CVSS score 9.3: 9.0 or more.

Published by the GitHub Advisory Database at 7 May 2026, 20:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
zebra-script	crates.io	<6.0.0	6.0.0
zebrad	crates.io	<4.4.0	4.4.0

Identifiers

GHSA-gq4h-3grw-2rhv · CVE-2026-44497

Weakness (CWE)

CWE-347

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

zebrad before 4.4.0 and zebra-script before 6.0.0 can accept transparent transactions with an invalid sighash hash type, splitting consensus from zcashd nodes. An attacker can trigger this over the network by crafting a transparent spend script. Upgrade zebrad to 4.4.0 and zebra-script to 6.0.0; no workaround is listed.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.3	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0019, the 8th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:18 UTC First seen by agentprime
31 Oct 2026, 15:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.