libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap).
Metrics
Affected Vendors & Products
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References
History
Wed, 31 Dec 2025 18:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | libcoap versions up to and including 4.3.5, prior to commit 30db3ea, contain a stack-based buffer overflow in address resolution when attacker-controlled hostname data is copied into a fixed 256-byte stack buffer without proper bounds checking. A remote attacker can trigger a crash and potentially achieve remote code execution depending on compiler options and runtime memory protections. Exploitation requires the proxy logic to be enabled (i.e., the proxy request handling code path in an application using libcoap). | |
| Title | libcoap Stack-Based Buffer Overflow in Address Resolution DoS or Potential RCE | |
| Weaknesses | CWE-121 | |
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cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2025-12-31T18:39:07.530Z
Reserved: 2025-04-15T19:15:22.607Z
Link: CVE-2025-34468
Vulnrichment
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NVD
Status : Awaiting Analysis
Published: 2025-12-31T19:15:43.923
Modified: 2025-12-31T20:42:15.637
Link: CVE-2025-34468
Redhat
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OpenCVE Enrichment
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