CVE-2024-56138

Verification disruption via unchecked TSA certificate revocation

Published Jan 13, 2025 · Updated Jan 14, 2025

Improper certificate validation in notation-go before 1.3.0-rc.2 allows man-in-the-middle attackers to disrupt signature verification. GenericSigner.Sign passed TSA roots and a timestamper into the signing request without a TSARevocationValidator, thereby accepting and storing countersignatures from revoked TSA chains. Exploitation requires interception of timestamp generation and control of a compromised or revoked TSA certificate; affected CI/CD verification can fail.

CVSS severity4.0
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in notation-go before 1.3.0-rc.2 allows man-in-the-middle attackers to disrupt signature verification. GenericSigner.Sign passed TSA roots and a timestamper into the signing request without a TSARevocationValidator, thereby accepting and storing countersignatures from revoked TSA chains. Exploitation requires interception of timestamp generation and control of a compromised or revoked TSA certificate; affected CI/CD verification can fail.

The record

CVE
CVE-2024-56138
Published
Jan 13, 2025
Updated
Jan 14, 2025
Vendor
Notary Project
Product
notation-go
Classifications
CWE-299, T1557
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.0-rc.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Notary Project · notation-goversion=< 1.3.0-rc.2

Published CVSS scores

4.0GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-299Improper Check for Certificate Revocation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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