CVE-2026-40070: BSV Ruby SDK is the Ruby SDK for the BSV blockchain

Routine

HIGH 8.1UPGRADEUPGRADE

CVE-2026-40070 is a high-severity flaw (CVSS 8.1) affecting bsv-wallet, bsv ruby sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

BSV Ruby SDK is the Ruby SDK for the BSV blockchain. From 0.3.1 to before 0.8.2, BSV::Wallet::WalletClient#acquire_certificate persists certificate records to storage without verifying the certifier's signature over the certificate contents. In acquisition_protocol: 'direct', the caller supplies all certificate fields (including signature:) and the record is written to storage verbatim. In acquisition_protocol: 'issuance', the client POSTs to a c

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-04-09
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-04-09 18:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

sgbett bsv-wallet UPGRADE

Affected: >= 0.1.2 and < 0.3.4

Fixed in: 0.3.4

Safe to downgrade to: a release before 0.1.2

1. Check installed version

apt-cache policy bsv-wallet || rpm -q bsv-wallet || bsv-wallet --version

2. UPGRADE to 0.3.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bsv-wallet

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bsv-wallet

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 0.1.2 (Debian / Ubuntu)

apt-cache madison bsv-wallet sudo apt install bsv-wallet=<VERSION_BEFORE_0.1.2> sudo apt-mark hold bsv-wallet

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

dnf --showduplicates list bsv-wallet sudo dnf downgrade bsv-wallet-<VERSION_BEFORE_0.1.2> sudo dnf versionlock add bsv-wallet

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.

sgbett bsv ruby sdk UPGRADE

Affected: >= 0.3.1 and < 0.8.2

Fixed in: 0.8.2

Safe to downgrade to: a release before 0.3.1

1. Check installed version

apt-cache policy bsv-ruby-sdk || rpm -q bsv-ruby-sdk || bsv-ruby-sdk --version

2. UPGRADE to 0.8.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bsv-ruby-sdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bsv-ruby-sdk

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 0.3.1 (Debian / Ubuntu)

apt-cache madison bsv-ruby-sdk sudo apt install bsv-ruby-sdk=<VERSION_BEFORE_0.3.1> sudo apt-mark hold bsv-ruby-sdk

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

dnf --showduplicates list bsv-ruby-sdk sudo dnf downgrade bsv-ruby-sdk-<VERSION_BEFORE_0.3.1> sudo dnf versionlock add bsv-ruby-sdk

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-2026-40070?

bsv-wallet: upgrade to 0.3.4; bsv ruby sdk: upgrade to 0.8.2. Exact commands for each OS are on this page.

Is CVE-2026-40070 being exploited?

CVE-2026-40070 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-2026-40070 affect?

CVE-2026-40070 affects bsv-wallet, bsv ruby sdk. Severity is high (CVSS 8.1). BSV Ruby SDK is the Ruby SDK for the BSV blockchain. From 0.3.1 to before 0.8.2, BSV::Wallet::WalletClient#acquire_certificate persists certificate records to storage without verifying the certifier's signature over the certificate contents

How urgent is CVE-2026-40070?

Priority 34/100. High severity; Public exploit reference

Software pages

Ruby vulnerabilities

References

← Back to latest CVEs