CVE-2026-44498: ZEBRA is a Zcash node written entirely in Rust

Q: How do I fix CVE-2026-44498?

zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-44498 being exploited?

CVE-2026-44498 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-2026-44498 affect?

CVE-2026-44498 affects zebrad. Severity is high (CVSS 7.5). ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd re

Q: How urgent is CVE-2026-44498?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-44498 is a high-severity flaw (CVSS 7.5) affecting 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 version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-682
Published	2026-05-08
Last modified	2026-06-17

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

Last updated 2026-06-17 · 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
2026-06-17 10:50 UTCUpdated Record last modified

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-2026-44498?

zebrad: upgrade to 4.4.0. Exact commands for each OS are on this page.

Is CVE-2026-44498 being exploited?

CVE-2026-44498 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-2026-44498 affect?

CVE-2026-44498 affects zebrad. Severity is high (CVSS 7.5). ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd re

How urgent is CVE-2026-44498?

Priority 36/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40881 HIGH 7.5 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust
CVE-2026-40880 HIGH 8.1 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust
CVE-2026-41583 CRITICAL 9.1 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust
CVE-2026-44500 MEDIUM 5.3 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust
CVE-2026-44497 CRITICAL 9.1 UPGRADE UPGRADE ZEBRA is a Zcash node written entirely in Rust

References

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