CVE-2021-38561

Name: CVE-2021-38561
Creator: NVD / NIST
Published: 2022-12-26T06:15:10.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2021-38561 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. golang.org/x/text/language in golang.org/x/text before 0.3.7 can panic with an out-of-bounds read during BCP 47 language tag parsing. Index calculation is mishandled. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

golang.org/x/text/language in golang.org/x/text before 0.3.7 can panic with an out-of-bounds read during BCP 47 language tag parsing. Index calculation is mishandled. If parsing untrusted user input, this can be used as a vector for a denial-of-service attack.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.36%

68.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Golang	Text	< 0.3.7

References

https://deps.dev/advisory/OSV/GO-2021-0113Patch, Third Party Advisory
https://go.googlesource.com/text/+/383b2e75a7a4198c42f8f87833eefb772868a56fMailing List, Patch, Vendor Advisory
https://groups.google.com/g/golang-announceMailing List, Third Party Advisory
https://pkg.go.dev/golang.org/x/text/languageProduct, Vendor Advisory
https://deps.dev/advisory/OSV/GO-2021-0113Patch, Third Party Advisory
https://go.googlesource.com/text/+/383b2e75a7a4198c42f8f87833eefb772868a56fMailing List, Patch, Vendor Advisory
https://groups.google.com/g/golang-announceMailing List, Third Party Advisory
https://pkg.go.dev/golang.org/x/text/languageProduct, Vendor Advisory

Timeline

Published: Dec 26, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38561?

How severe is CVE-2021-38561?

CVE-2021-38561 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38561?

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-2021-38561?

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

Scan your code now

Source: NVD / NIST