Out-of-bounds Read Affecting libcoap package, versions [,cci.20200424)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CONAN-LIBCOAP-16125196
- published22 Apr 2026
- disclosed17 Apr 2026
- creditKazuma Matsumoto
Introduced: 17 Apr 2026
CVE-2026-29013 (opens in a new tab)How to fix?
Upgrade libcoap to version cci.20200424 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Read in the get_byte_inc() function during CBOR parsing in OSCORE negotiation. An attacker can access sensitive memory contents or cause a heap buffer overflow by sending specially crafted CoAP requests with malformed OSCORE options or responses.
Note:
This is only exploitable if the library is compiled with NDEBUG, which disables assert-based bounds checking.