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VulnerabilityPublished

CVE-2026-44500: ZcashFoundation zebra · Unthrottled Resource Allocation

Affects ZcashFoundation zebraSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium · fixed in 4.4.0 : update ZcashFoundation zebra when convenient.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.4.0, 7.0.0, 6.0.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade github/ZcashFoundation/zebrad to 4.4.0; github/ZcashFoundation/zebra-chain to 7.0.0; github/ZcashFoundation/zebra-network to 6.0.0.

Affected software

ProductAffectedFixed in
ZcashFoundationzebraAffected
  • =zebrad < 4.4.0
  • =zebra-chain < 7.0.0
  • =zebra-network < 6.0.0
Fixed in–
crates.iogithub/ZcashFoundation/zebradpkg:cargo/github/ZcashFoundation/zebradOther threatsAffected
  • <4.4.0
Fixed in
  • 4.4.0
crates.iogithub/ZcashFoundation/zebra-chainpkg:cargo/github/ZcashFoundation/zebra-chainOther threatsAffected
  • <7.0.0
Fixed in
  • 7.0.0
crates.iogithub/ZcashFoundation/zebra-networkpkg:cargo/github/ZcashFoundation/zebra-networkOther threatsAffected
  • <6.0.0
Fixed in
  • 6.0.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should upgrade to zebrad version 4.4.0 or later, zebra-chain version 7.0.0 or later, and zebra-network version 6.0.0 or later to apply the official fixes. Patch status is not explicitly stated in the vendor advisory, but the description confirms the issue is fixed in these versions. No additional mitigation is indicated.

Description

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.4.0, prior to zebra-chain version 7.0.0, and prior to zebra-network version 6.0.0, several inbound deserialization paths in Zebra allocated buffers sized against generic transport or block-size ceilings before the tighter protocol or consensus limits were enforced. An unauthenticated or post-handshake peer could therefore force the node to preallocate and parse for orders of magnitude more data than the protocol intended, across headers messages, equihash solutions in block headers, Sapling spend vectors in V5/V4 transactions, and coinbase script bytes in blocks. This issue has been patched in zebrad version 4.4.0, zebra-chain version 7.0.0, and zebra-network version 6.0.0.

References

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