CVE-2026-123559: high-severity vulnerability in ZcashFoundation zebra
Zebra before 7.0.0 Denial of Service via Quadratic Sighash Computation
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
18Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7
Zebra before 7.0.0 contains an inefficient algorithmic complexity vulnerability that allows unauthenticated peers to exhaust verification threads by submitting transactions with many transparent inputs. Attackers can relay invalid transactions with tens of thousands of inputs, forcing quadratic ZIP-244 or ZIP-243 digest recomputation that stalls Rayon-backed block verification for minutes.
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
Affected products
ZcashFoundation · zebraRelated CVEs — ZcashFoundation zebra
In the same product, most dangerous first.
CVE-2026-34202CRITICALZebra node crash — V5 transaction hash panic (P2P reachable)EPSS 0.8%CVE-2026-52736HIGHZEBRA: Block suppression via NU5 same-header body poisoning of sent-hash cacheEPSS 0.6%CVE-2026-52829HIGHZEBRA: IPv4-Mapped Mempool Misbehavior Update Aborts Zebra Address BookEPSS 0.6%CVE-2026-52731MEDIUMZEBRA: Full node denial of service via non-ASCII LongPollId in getblocktemplateEPSS 0.5%CVE-2026-52739MEDIUMZEBRA: Repeated Non-Finalized Shielded Transaction Aborts Zebra Before Duplicate-Nullifier RejectionEPSS 0.5%CVE-2026-52732MEDIUMZEBRA: Mempool transaction admission denial via single-peer inbound queue saturationEPSS 0.5%