In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination…
Priority LOW 26CWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination buffer size and source character limit, as demonstrated by an invalid write access (buffer overflow).
Why it matters now
EPSS 0.00652 51st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:musl-libc:musl:*:*:*:*:*:*:*:* | up to 1.2.1 | Vulnerable | musl-libc |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* | 33 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* | 34 | Vulnerable | Fedoraproject |
| cpe:2.3:a:oracle:graalvm:20.3.2:*:*:*:enterprise:*:*:* | 20.3.2 | Vulnerable | Oracle |
| cpe:2.3:a:oracle:graalvm:21.1.0:*:*:*:enterprise:*:*:* | 21.1.0 | Vulnerable | Oracle |
- cpe:2.3:a:musl-libc:musl:*:*:*:*:*:*:*:* Versions up to 1.2.1 Vulnerable ·musl-libc
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
- cpe:2.3:a:oracle:graalvm:20.3.2:*:*:*:enterprise:*:*:* Versions 20.3.2 Vulnerable ·Oracle
- cpe:2.3:a:oracle:graalvm:21.1.0:*:*:*:enterprise:*:*:* Versions 21.1.0 Vulnerable ·Oracle
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-28928
- 2026-10-03 Alias added: GHSA-7gwx-j9qc-6c6w
- 2026-10-14 EPSS moved to the 50th–90th percentile
References
Patch 2
Advisory 5
Other 3
- [apisix-notifications] 20210428 [GitHub] [apisix-docker] tao12345666333 opened a new pull request #166: fix: upgrade alpine version due to CVE-2020-28928
- [apisix-notifications] 20210428 [apisix-docker] branch master updated: fix: upgrade alpine version due to CVE-2020-28928 (#166)
- [apisix-notifications] 20210428 [GitHub] [apisix-docker] starsz merged pull request #166: fix: upgrade alpine version due to CVE-2020-28928
Sources
- CVE-2020-28928 · CVE Program
- CVE-2020-28928 · NVD
- FIRST EPSS
- GHSA-7gwx-j9qc-6c6w · GitHub Advisory Database · CC BY 4.0
- CVE-2020-28928 · Red Hat security data · CC BY 4.0
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