CVE-2026-3194: A flaw has been found in Chia Blockchain 2.1.0

Routine

MEDIUM 4.5DOWNGRADE

CVE-2026-3194 is a medium-severity flaw (CVSS 4.5) affecting blockchain. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in Chia Blockchain 2.1.0. The affected element is the function send_transaction/get_private_key of the component RPC Server Master Passphrase Handler. This manipulation causes missing authentication. The attack can only be executed locally. The attack's complexity is rated as high. The exploitability is described as difficult. The exploit has been published and may be used. The vendor was informed early via email. A separate

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.5 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-287, CWE-306
Published	2026-02-25
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: chia

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

Am I affected?

Timeline

2026-02-25 18:23 UTCPublished CVE record published
2026-06-17 10:43 UTCUpdated Record last modified

chia blockchain DOWNGRADE

Affected: 2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison blockchain sudo apt install blockchain=<VERSION_BEFORE_2.1.0> sudo apt-mark hold blockchain

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list blockchain sudo dnf downgrade blockchain-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add blockchain

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-2026-3194?

blockchain: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-3194 being exploited?

CVE-2026-3194 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-2026-3194 affect?

CVE-2026-3194 affects blockchain. Severity is medium (CVSS 4.5). A flaw has been found in Chia Blockchain 2.1.0. The affected element is the function send_transaction/get_private_key of the component RPC Server Master Passphrase Handler. This manipulation causes missing authentication. The attack can onl

How urgent is CVE-2026-3194?

Priority 25/100. Public exploit reference

Related CVEs

CVE-2026-3193 LOW 3.1 DOWNGRADE A vulnerability was detected in Chia Blockchain 2.1.0
CVE-2026-3192 MEDIUM 5.6 DOWNGRADE A security vulnerability has been detected in Chia Blockchain 2.1.0

References

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