Integer Underflow Vulnerability in Espressif IoT Development Framework's WPS Implementation
CVE-2026-25532

6.3MEDIUM

Key Information:

Vendor

Espressif

Status
Esp-idf
Vendor
CVE Published:
4 February 2026

What is CVE-2026-25532?

An integer underflow vulnerability exists in the WPS (Wi-Fi Protected Setup) Enrollee implementation of the Espressif IoT Development Framework. This issue arises when malformed EAP-WSC packets, with truncated payloads, are processed. The vulnerability allows an attacker to manipulate the fragment length calculation, potentially leading to unexpected behavior. Specifically, by sending packets where the EAP Length field only includes the header and flags, the fragment length becomes negative. This negative value is subsequently cast to a size_t type, allowing an attacker to exploit the system. This issue has been addressed in versions 5.5.3, 5.4.4, 5.3.5, 5.2.7, and 5.1.7.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

esp-idf = 5.5.2 = 5.5.2

esp-idf = 5.4.3 = 5.4.3

esp-idf = 5.3.4 = 5.3.4

References

https://github.com/espressif/esp-idf/security/advisories/...
x_refsource_CONFIRM
https://github.com/espressif/esp-idf/commit/60f992a26de17...
x_refsource_MISC
https://github.com/espressif/esp-idf/commit/6f6766f917bc9...
x_refsource_MISC

CVSS V3.1

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.