CVE-2021-38561
CVE-2021-38561 is a high-severity vulnerability in Golang Text with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (68th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Golang Text
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-38561?
- 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.
- How severe is CVE-2021-38561?
- CVE-2021-38561 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-38561 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-38561?
- CVE-2021-38561 affects Golang Text. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-38561?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-38561 published?
- CVE-2021-38561 was published on 2022-12-26 and last updated on 2026-06-17.
References
- https://deps.dev/advisory/OSV/GO-2021-0113
- https://go.googlesource.com/text/+/383b2e75a7a4198c42f8f87833eefb772868a56f
- https://groups.google.com/g/golang-announce
- https://pkg.go.dev/golang.org/x/text/language
Affected products (1)
- cpe:2.3:a:golang:text:*:*:*:*:*:*:*:*
More vulnerabilities in Golang Text
- CVE-2022-32149 — High (CVSS 7.5): An attacker may cause a denial of service by crafting an Accept-Language header which ParseAcceptLanguage will take…
- CVE-2020-28852 — High (CVSS 7.5): In x/text in Go before v0.3.5, a "slice bounds out of range" panic occurs in language.ParseAcceptLanguage while…
- CVE-2020-14040 — High (CVSS 7.5): The x/text package before 0.3.3 for Go has a vulnerability in encoding/unicode that could lead to the UTF-16 decoder…
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