GHSA-c32p-wcqj-j677

Source

https://github.com/advisories/GHSA-c32p-wcqj-j677

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-c32p-wcqj-j677/GHSA-c32p-wcqj-j677.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-c32p-wcqj-j677

Published

2026-01-23T16:56:23Z

Modified

2026-02-03T03:08:39.997638Z

Severity

7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

CometBFT has inconsistencies between how commit signatures are verified and how block time is derived

Details

CSA-2026-001: Tachyon

Description

Name: CSA-2026-001: Tachyon

Criticality: Critical (Catastrophic Impact; Possible Likelihood per ACMv1.2)

Affected versions: All versions of CometBFT

Affected users: Validators and protocols relying on block timestamps

Description

A consensus-level vulnerability was discovered in CometBFT's "BFT Time" implementation due to an inconsistency between how commit signatures are verified and how block time is derived.

This breaks a core BFT Time guarantee: "A faulty process cannot arbitrarily increase the Time value."

Impact

Downstream impact on chains affects any module, smart contract, or system that relies on the block timestamp.

Patches

The new CometBFT releases v0.38.21 and v0.37.18 fix this issue. The main unreleased branch is also patched.

Workarounds

There are no effective workarounds for this vulnerability. Upgrading to patched versions is required.

Timeline

January 8, 2026, 5:27PM UTC: Issue reported to Cosmos Bug Bounty Program
January 9, 2026, 4:55AM UTC: Issue triaged and validated by core team
January 12, 2026, 10:25PM UTC: Core team completes patch for the issue
January 13, 2026 4:41PM UTC: Pre-notification delivered to ecosystem partners
January 23, 2026, 3:00PM UTC: Patch made available

Credits

This issue was reported to the Cosmos Bug Bounty Program on HackerOne. Credit to SEAL 911 and QED Audit for the discovery and help with the patch.

If you believe you have found a bug in the Cosmos Stack or would like to contribute to the program by reporting a bug, please see https://hackerone.com/cosmos.

If you have questions about Cosmos security efforts, please reach out to our official communication channel at security@cosmoslabs.io.

A Github Security Advisory for this issue is available in the CometBFT repository. For more information about CometBFT, see https://docs.cometbft.com/.

Database specific

{
    "nvd_published_at": null,
    "cwe_ids": [
        "CWE-703"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-23T16:56:23Z"
}

References

Affected packages

Go / github.com/cometbft/cometbft

Package

Name: github.com/cometbft/cometbft; View open source insights on deps.dev
Purl: pkg:golang/github.com/cometbft/cometbft

Affected ranges

Type: SEMVER
Events: Introduced

0.38.0-alpha.1

Fixed

0.38.21

Database specific

last_known_affected_version_range

"<= 0.38.20"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-c32p-wcqj-j677/GHSA-c32p-wcqj-j677.json"