Vulnerability in zebrad (CVE-2026-41584)
Summary
Vulnerability in zebrad (CVE-2026-41584). Risk of unauthorized operations or information disclosure. Exploitable via orchard. Mitigation: upgrade to 4.3.1 or later.
Original description
The description as published by the source.
rk Identity Point Panic in Transaction Verification
Summary
Orchard transactions contain a rk field which is a randomized validating key and also an elliptic curve point. The Zcash specification allows the field to be the identity (a "zero" value), however, the orchard crate which is used to verify Orchard proofs would panic when fed a rk with the identity value. Thus an attacker could send a crafted transaction that would make a Zebra node crash.
Severity
Critical - This is a Denial of Service Vulnerability that could allow an attacker to crash Zebra nodes.
Affected Versions
All Zebra versions prior to version 4.3.1.
Description
The vulnerability exists in the circuits.rs file of the orchard crate; it attempts to get the coordinates of the rk value and calls unwrap() on the results, which causes a panic if rk is the identity.
Zebra parses rk as a byte vector; it creates an Orchard "bundle" using the orchard crate and then calls the same crate to verify it, triggering the panic.
An attacker could exploit this by:
- Creating a transaction with a identity
rk - Submitting it to a Zebra node, making it crash
Impact
Denial of Service
- Attack Vector: Network.
- Effect: Node crash.
- Scope: Any impacted Zebra node.
Fixed Versions
This issue is fixed in Zebra 4.3.1.
The fix was agreed with zcashd developers (which has the same issue) to not allow the identity rk anymore and change the specif…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-41584 has been found in zebrad.
Attackers can target a specific entry point like orchard over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade zebrad to 4.3.1 or later.
If unsure, ask your IT team or search "zebrad CVE-2026-41584" on the vendor's site.
CVE-2026-41584 (zebrad) — CWE-617 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: orchard / circuits.rs / zcashd
Patched: 4.3.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-617) exists in zebrad. Attackers reach the vulnerable code path via orchard without authentication.
Check the vendor advisory for the affected versions of zebrad. Attack surface: orchard / circuits.rs / zcashd.
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.
Update to 4.3.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'zebrad' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'zebrad' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
zebradを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade zebrad to 4.3.1ステージング環境で 4.3.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com