CVE-2023-34451: CometBFT is a Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine and replicates i

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HIGH 8.2REMOTEUPGRADE

CVE-2023-34451 is a high-severity flaw (CVSS 8.2) affecting cometbft. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CometBFT is a Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine and replicates it on many machines. The mempool maintains two data structures to keep track of outstanding transactions: a list and a map. These two data structures are supposed to be in sync all the time in the sense that the map tracks the index (if any) of the transaction in the list. In `v0.37.0`, and `v0.37.1`, as well as in `v0.34.28`, and all prev

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-401
Published	2023-07-03
Last modified	2026-06-17

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

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-03 17:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

cometbft cometbft UPGRADE

Affected: >= 0.34.28 and < 0.34.29 · >= 0.37.0 and < 0.37.2

Fixed in: 0.34.29, 0.37.2

Safe to downgrade to: a release before 0.34.28

1. Check installed version

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

2. UPGRADE to 0.34.29 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cometbft

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.34.28 (Debian / Ubuntu)

apt-cache madison cometbft sudo apt install cometbft=<VERSION_BEFORE_0.34.28> sudo apt-mark hold cometbft

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cometbft sudo dnf downgrade cometbft-<VERSION_BEFORE_0.34.28> sudo dnf versionlock add cometbft

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-34451?

cometbft: upgrade to 0.34.29, 0.37.2. Exact commands for each OS are on this page.

Is CVE-2023-34451 being exploited?

CVE-2023-34451 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-2023-34451 affect?

CVE-2023-34451 affects cometbft. Severity is high (CVSS 8.2). CometBFT is a Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine and replicates it on many machines. The mempool maintains two data structures to keep track of outstanding transactions: a list and a map. These t

How urgent is CVE-2023-34451?

Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-34450 LOW 3.7 UPGRADE CometBFT is a Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine and replicates i

References

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