CVE-2026-44500: ZEBRA is a Zcash node written entirely in Rust

Q: How do I fix CVE-2026-44500?

zebra-chain: upgrade to 7.0.0; zebra-network: upgrade to 6.0.0; zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-44500 being exploited?

CVE-2026-44500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-44500 affect?

CVE-2026-44500 affects zebra-chain, zebra-network, zebrad. Severity is medium (CVSS 5.3). 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 gene

Q: How urgent is CVE-2026-44500?

Priority 36/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADEUPGRADEUPGRADE

CVE-2026-44500 is a medium-severity flaw (CVSS 5.3) affecting zebra-chain, zebra-network, zebrad. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 o

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 70%)
CISA exploited list	No
Weakness	CWE-770
Published	2026-05-08
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: zfnd

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 15:17 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

zfnd zebra-chain UPGRADE

Affected: < 7.0.0

Fixed in: 7.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zebra-chain || rpm -q zebra-chain || zebra-chain --version

2. UPGRADE to 7.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zebra-chain

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebra-chain

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

zfnd zebra-network UPGRADE

Affected: < 6.0.0

Fixed in: 6.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zebra-network || rpm -q zebra-network || zebra-network --version

2. UPGRADE to 6.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zebra-network

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebra-network

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

zfnd zebrad UPGRADE

Affected: < 4.4.0

Fixed in: 4.4.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy zebrad || rpm -q zebrad || zebrad --version

2. UPGRADE to 4.4.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zebrad

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zebrad

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44500?

zebra-chain: upgrade to 7.0.0; zebra-network: upgrade to 6.0.0; zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Is CVE-2026-44500 being exploited?

CVE-2026-44500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44500 affect?

CVE-2026-44500 affects zebra-chain, zebra-network, zebrad. Severity is medium (CVSS 5.3). 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 gene

How urgent is CVE-2026-44500?

Priority 36/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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