CVE-2021-41087

Name: CVE-2021-41087
Creator: NVD / NIST
Published: 2021-09-21T21:15:07.203+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.42%

Last modified Jun 17, 2026

CVE-2021-41087 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. in-toto-golang is a go implementation of the in-toto framework to protect software supply chain integrity. In affected versions authenticated attackers posing as functionaries (i.e., within a trusted set of users for a layout) are able to create attestations that may bypass DISALLOW rules in the same layout. EPSS estimates a 0.42% chance of exploitation in the next 30 days.

Description

in-toto-golang is a go implementation of the in-toto framework to protect software supply chain integrity. In affected versions authenticated attackers posing as functionaries (i.e., within a trusted set of users for a layout) are able to create attestations that may bypass DISALLOW rules in the same layout. An attacker with access to trusted private keys, may issue an attestation that contains a disallowed artifact by including path traversal semantics (e.g., foo vs dir/../foo). Exploiting this vulnerability is dependent on the specific policy applied. The problem has been fixed in version 0.3.0.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.42%

33.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
In-Toto	In-Toto-Golang	< 0.3.0

References

https://github.com/in-toto/in-toto-golang/commit/f2c57d1e0f15e3ffbeac531829c696b72ecc4290Patch, Third Party Advisory
https://github.com/in-toto/in-toto-golang/security/advisories/GHSA-vrxp-mg9f-hwf3Third Party Advisory
https://github.com/in-toto/in-toto-golang/commit/f2c57d1e0f15e3ffbeac531829c696b72ecc4290Patch, Third Party Advisory
https://github.com/in-toto/in-toto-golang/security/advisories/GHSA-vrxp-mg9f-hwf3Third Party Advisory

Timeline

Published: Sep 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41087?

How severe is CVE-2021-41087?

CVE-2021-41087 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41087?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41087?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST