CVE-2021-41135: The Cosmos-SDK is a framework for building blockchain applications in Golang

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MEDIUM 6.5UPGRADE

CVE-2021-41135 is a medium-severity flaw (CVSS 6.5) affecting cosmos sdk. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Cosmos-SDK is a framework for building blockchain applications in Golang. Affected versions of the SDK were vulnerable to a consensus halt due to non-deterministic behaviour in a ValidateBasic method in the x/authz module. The MsgGrant of the x/authz module contains a Grant field which includes a user-defined expiration time for when the authorization grant expires. In Grant.ValidateBasic(), that time is compared to the node’s local clock tim

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-754
Published	2021-10-20
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2021-10-20 18:15 UTCPublished CVE record published
2026-06-17 04:07 UTCUpdated Record last modified

interchain cosmos sdk UPGRADE

Affected: >= 0.43.0 and < 0.44.2

Fixed in: 0.44.2

Safe to downgrade to: a release before 0.43.0

1. Check installed version

apt-cache policy cosmos-sdk || rpm -q cosmos-sdk || cosmos-sdk --version

2. UPGRADE to 0.44.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cosmos-sdk

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cosmos-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 0.43.0 (Debian / Ubuntu)

apt-cache madison cosmos-sdk sudo apt install cosmos-sdk=<VERSION_BEFORE_0.43.0> sudo apt-mark hold cosmos-sdk

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

dnf --showduplicates list cosmos-sdk sudo dnf downgrade cosmos-sdk-<VERSION_BEFORE_0.43.0> sudo dnf versionlock add cosmos-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-2021-41135?

cosmos sdk: upgrade to 0.44.2. Exact commands for each OS are on this page.

Is CVE-2021-41135 being exploited?

CVE-2021-41135 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-2021-41135 affect?

CVE-2021-41135 affects cosmos sdk. Severity is medium (CVSS 6.5). The Cosmos-SDK is a framework for building blockchain applications in Golang. Affected versions of the SDK were vulnerable to a consensus halt due to non-deterministic behaviour in a ValidateBasic method in the x/authz module. The MsgGrant

How urgent is CVE-2021-41135?

Priority 47/100. Public exploit reference

Software pages

Go (Golang) vulnerabilities

References

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