CVE-2026-10657
- Source
- https://cve.org/CVERecord?id=CVE-2026-10657
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-10657.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-10657
- Aliases
-
- GHSA-76jh-3j5f-9vq4
- Published
- 2026-07-05T22:23:37Z
- Modified
- 2026-10-28T02:59:18Z
- Severity
-
- 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- Out-of-bounds read in Zephyr DNS resolver mDNS suffix check (memcmp past string NUL)
- Details
-
Zephyr's DNS resolver detects mDNS (.local) queries in dns_resolve_name_internal() (subsys/net/lib/dns/resolve.c) with memcmp(strrchr(query, '.'), ".local", 7), which always reads a fixed 7 bytes from the suffix pointer. When the resolved hostname's final label is shorter than 7 bytes (e.g. names ending in .org, .com, .net, .io, or a trailing dot), the comparison reads 1-2 bytes past the string's NUL terminator.
The hostname (query) is the caller-supplied name passed through the standard getaddrinfo()/dns_get_addr_info()/dns_resolve_name() path and is influenceable by operators or remote inputs (server names from configuration, parsed URLs, or app-facing interfaces).
On a tightly-sized buffer with no slack (for example a userspace getaddrinfo call where the hostname is copied with k_usermode_string_alloc_copy to exactly strlen+1 bytes), the over-read crosses the allocation boundary; if that boundary is unmapped (guard page, memory-domain boundary under MPU, or an address sanitizer) the over-read faults, causing a denial of service. The over-read bytes are never returned, so there is no information disclosure.
The flaw is compiled only when CONFIG_MDNS_RESOLVER is enabled, exists since v1.10.0, and is fixed by replacing the fixed-length memcmp with a NUL-safe strcmp(ptr, ".local").
- Database specific
{ "cna_assigner": "zephyr", "cwe_ids": [ "CWE-125" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10657.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10657.json
- https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-76jh-3j5f-9vq4
- https://nvd.nist.gov/vuln/detail/CVE-2026-10657
- https://github.com/zephyrproject-rtos/zephyr/commit/448a21da12c9ea28f7fd12c6894e03a987b17a27
- https://github.com/zephyrproject-rtos/zephyr
Affected packages
Git / github.com/zephyrproject-rtos/zephyr
Affected ranges
- Type
- GIT
- Repo
- https://github.com/zephyrproject-rtos/zephyr
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "1.10.0" }, { "fixed": "4.3.1" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "range": [ { "introduced": "4.4.0" }, { "fixed": "4.4.2" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "range": [ { "fixed": "448a21da12c9ea28f7fd12c6894e03a987b17a27" } ], "source": "REFERENCES_COMMIT" } ] }