CVSS 3.1
7.4 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:HCVE-2026-113783
High (7.4).
ESP-IDF is the Espressif Internet of Things (IOT) Development Framework. From 5.2.3 until 5.3.7, 5.4.5, 5.5.6, and 6.0.3, the lwIP DNS resolver's cached-lookup path in dns_lookup() in dns.c copies every cached address into a caller-provided single ip_addr_t output buffer without a length parameter or bounds check. When CONFIG_LWIP_DNS_MAX_HOST_IP is greater than 1 and a cached hostname has multiple A or AAAA records, a subsequent lookup through dns_gethostbyname() or dns_gethostbyname_addrtype() writes beyond the single-element buffer into adjacent stack memory. A network-positioned attacker who influences DNS responses can cause a reboot through stack-canary corruption or, without stack protection, overwrite stack variables with attacker-controlled address bytes and potentially redirect control flow. This issue is fixed in versions 5.5.6 and 6.0.3 and is scheduled to be fixed in versions 5.3.7 and 5.4.5. No fixed release is available for the end-of-life 5.2 line.
Severity
- CWE
- CWE-121 Stack-based Buffer Overflow
- Published
- Record from
- the NVD, synced
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-113783 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-113783?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-113783?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-113783 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| espressif esp-idf | >= 5.2.3, <= 5.2.8 |
| espressif esp-idf | >= 5.3.2, < 5.3.7 |
| espressif esp-idf | >= 5.4.0, < 5.4.5 |
| espressif esp-idf | >= 5.5.0, < 5.5.6 |
| espressif esp-idf | >= 6.0.0, < 6.0.3 |
References
- https://github.com/espressif/esp-idf/commit/75f2ff7e0c2d19e113293ec122b701c83d2f6665
- https://github.com/espressif/esp-idf/commit/7ab85eb4dc7d7695960d940badcd62592c365056
- https://github.com/espressif/esp-idf/commit/882843dbf838b0c02e09d46bb6283bda73496b8c
- https://github.com/espressif/esp-idf/commit/98e6e7a08fca391563651a1e751cc45a3b27d18b
- https://github.com/espressif/esp-idf/commit/af7543d00a4d7b489e010a70b59fd3d8022a40f4
- https://github.com/espressif/esp-idf/commit/defaa2f559470acfee5e2e5ea80a79b73424d483
- https://github.com/espressif/esp-idf/security/advisories/GHSA-ch63-jxm5-vmvf