CVE-2025-62408
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-08

Last updated on: 2025-12-08

Assigner: GitHub, Inc.

Description
c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.
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Meta Information
Published
2025-12-08
Last Modified
2025-12-08
Generated
2026-06-16
AI Q&A
2025-12-09
EPSS Evaluated
2026-06-15
NVD
CVE-2025-62408
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
c-ares c-ares 1.32.4
c-ares c-ares 1.34.5
c-ares c-ares 1.34.6
c-ares c-ares 1.32.3
c-ares c-ares 1.32.5
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

This vulnerability exists in the c-ares asynchronous resolver library versions 1.32.3 through 1.34.5. The issue occurs because the library terminates a query after maximum attempts when using the functions read_answer() and process_answer(), which can lead to a Denial of Service (DoS) condition. The problem is fixed in version 1.34.6.

Impact Analysis

The vulnerability can cause a Denial of Service (DoS) by terminating queries prematurely in the c-ares library, potentially disrupting applications or services that rely on asynchronous DNS resolution, leading to service unavailability or degraded performance.

Mitigation Strategies

Upgrade the c-ares library to version 1.34.6 or later, as this version contains the fix for the Denial of Service vulnerability.

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