What’s Vulnerable › Vulnerabilities

CVE-2025-34297: KissFFT Integer Overflow Heap Buffer Overflow via kiss_fft_alloc

• Severity: high (CVSS 8.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-01 · updated 2026-10-18
• Weakness: CWE-190

Description

KissFFT versions prior to the fix commit 1b083165 contain an integer overflow in kiss_fft_alloc() in kiss_fft.c on platforms where size_t is 32-bit. The nfft parameter is not validated before being used in a size calculation (sizeof(kiss_fft_cpx) * (nfft - 1)), which can wrap to a small value when nfft is large. As a result, malloc() allocates an undersized buffer and the subsequent twiddle-factor initialization loop writes nfft elements, causing a heap buffer overflow. This vulnerability only affects 32-bit architectures.

References

• https://github.com/mborgerding/kissfft/commit/1b08316582049c3716154caefc0deab8758506e3
• https://github.com/mborgerding/kissfft/issues/120
• https://www.vulncheck.com/advisories/kissfft-integer-overflow-heap-buffer-overflow

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