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CVE-2026-104436 (GCVE-0-2026-104436)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-29 21:15

Title

Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length

Summary

Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.

Severity

6.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-02 14:51 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

VulnCheck CNA

References

2 references

URL	Tags
https://github.com/ZcashFoundation/zebra/security…	vendor-advisory
https://www.vulncheck.com/advisories/zebra-before…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version
ZcashFoundation	zebra	Affected: 0 , < 4.5.0 (semver) Unaffected: 4.5.0 (semver)
ZcashFoundation	zebra-chain	Affected: 0 , < 8.0.0 (semver) Unaffected: 8.0.0 (semver)

Date Public

2026-05-29 00:00

Credits

dingledropper mpguerra oxarbitrage

Show details on NVD website

JSON

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CVE-2026-34202 (GCVE-0-2026-34202)

Vulnerability from cvelistv5 – Published: 2026-03-31 14:02 – Updated: 2026-03-31 17:17

Title

Zebra node crash — V5 transaction hash panic (P2P reachable)

Summary

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-chain version 6.0.1, a vulnerability in Zebra's transaction processing logic allows a remote, unauthenticated attacker to cause a Zebra node to panic (crash). This is triggered by sending a specially crafted V5 transaction that passes initial deserialization but fails during transaction ID calculation. This issue has been patched in zebrad version 4.3.0 and zebra-chain version 6.0.1.

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-31 17:16 UTC

CWE

CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
CWE-94 - Improper Control of Generation of Code ('Code Injection')