CVE-2026-22211
CVE-2026-22211 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.1. 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-787.
Key facts
- Severity: Medium (CVSS 4.0 base score 5.1)
- EPSS exploit prediction: 0% (5th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-2457
- Weakness: CWE-787
- Published:
- Last modified:
Description
TinyOS versions up to and including 2.1.2 contain a global buffer overflow vulnerability in the printfUART formatted output implementation used within the ZigBee / IEEE 802.15.4 networking stack. The implementation formats output into a fixed-size global buffer and concatenates strings for %s format specifiers using strcat() without verifying remaining buffer capacity. When printfUART is invoked with a caller-controlled string longer than the available space, the unbounded sprintf/strcat sequence writes past the end of debugbuf, resulting in global memory corruption. This can cause denial of service, unintended behavior, or information disclosure via corrupted adjacent global state or UART output.
Frequently asked questions
- What is CVE-2026-22211?
- TinyOS versions up to and including 2.1.2 contain a global buffer overflow vulnerability in the printfUART formatted output implementation used within the ZigBee / IEEE 802.15.4 networking stack. The implementation formats output into a fixed-size global buffer and concatenates strings for %s format specifiers using strcat() without verifying remaining buffer capacity. When printfUART is invoked with a caller-controlled string longer than the available space, the unbounded sprintf/strcat sequence writes past the end of debugbuf, resulting in global memory corruption. This can cause denial of service, unintended behavior, or information disclosure via corrupted adjacent global state or UART output.
- How severe is CVE-2026-22211?
- CVE-2026-22211 has a CVSS 4.0 base score of 5.1, rated medium severity.
- Is CVE-2026-22211 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-22211?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-22211 have an EU (EUVD) identifier?
- Yes. CVE-2026-22211 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2457.
- When was CVE-2026-22211 published?
- CVE-2026-22211 was published on 2026-01-14 and last updated on 2026-06-17.
References
- https://github.com/tinyos/tinyos-main
- https://seclists.org/fulldisclosure/2026/Jan/14
- https://www.vulncheck.com/advisories/tinyos-global-buffer-overflow-in-printfuart
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