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libcoap

A memory disclosure vulnerability exists in libcoap's OSCORE configuration parser in libcoap before release-4.3.5-patches. An out-of-bounds read may occur when parsing certain configuration values, allowing an attacker to infer or read memory beyond string boundaries in the .rodata section. This could potentially lead to information disclosure or denial of service.

CVE-2025-59391 identifies a memory disclosure vulnerability in the libcoap library, specifically within the OSCORE configuration parser component. libcoap is a widely used open-source implementation of the Constrained Application Protocol (CoAP), which is designed for resource-constrained devices and IoT environments. The vulnerability arises due to an out-of-bounds read condition triggered when the parser processes certain malformed or crafted configuration values. This out-of-bounds read occurs in the .rodata section of memory, which typically contains read-only data such as string literals and configuration constants. By exploiting this flaw, an attacker can infer or directly read memory contents beyond the intended boundaries, potentially leaking sensitive information such as cryptographic keys, configuration secrets, or other critical data stored in memory. Additionally, the flaw can cause the application to crash, resulting in a denial of service. The vulnerability does not require prior authentication, as it can be triggered by supplying malicious configuration data to the parser. However, exploitation requires the attacker to have the ability to influence or provide configuration inputs to the vulnerable libcoap instance. Currently, no public exploits or active exploitation campaigns have been reported. The issue affects libcoap versions before release-4.3.5-patches, and users are advised to upgrade to patched versions once available. Given libcoap's role in IoT and constrained device communications, this vulnerability poses a risk to systems relying on secure CoAP messaging via OSCORE, especially in environments where confidentiality and availability are critical.

Detailed information about CVE-2025-59391: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2025-59391: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-59391: n/a

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