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

CVE-2025-34297 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2025-34297, released December 1, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-34297
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 1, 2025
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-34297

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kiss-fft Fedora 43 | 131.2.0-1.fc43 | [FEDORA-2026-291357ABAB](https://patchblox.com/security/data/fix/linux/fedora-2026-291357abab.md) | Mar 9, 2026 |
| Linux | kiss-fft-debuginfo Fedora 43 | 131.2.0-1.fc43 | [FEDORA-2026-291357ABAB](https://patchblox.com/security/data/fix/linux/fedora-2026-291357abab.md) | Mar 9, 2026 |
| Linux | kiss-fft-debugsource Fedora 43 | 131.2.0-1.fc43 | [FEDORA-2026-291357ABAB](https://patchblox.com/security/data/fix/linux/fedora-2026-291357abab.md) | Mar 9, 2026 |
| Linux | kiss-fft-devel Fedora 43 | 131.2.0-1.fc43 | [FEDORA-2026-291357ABAB](https://patchblox.com/security/data/fix/linux/fedora-2026-291357abab.md) | Mar 9, 2026 |
| Linux | kiss-fft-static Fedora 43 | 131.2.0-1.fc43 | [FEDORA-2026-291357ABAB](https://patchblox.com/security/data/fix/linux/fedora-2026-291357abab.md) | Mar 9, 2026 |
| Linux | kissfft Debian 12.15 (bookworm) | 131.1.0-4.1~deb12u1 | [DEBIAN-CVE-2025-34297](https://patchblox.com/security/data/fix/linux/debian-cve-2025-34297.md) | Dec 1, 2025 |
| Linux | kissfft Debian 13.5 (trixie) | 131.1.0-4.1~deb13u1 | [DEBIAN-CVE-2025-34297](https://patchblox.com/security/data/fix/linux/debian-cve-2025-34297.md) | Dec 1, 2025 |
| Linux | kissfft Debian 14 | 131.1.0-4.1 | [DEBIAN-CVE-2025-34297](https://patchblox.com/security/data/fix/linux/debian-cve-2025-34297.md) | Dec 1, 2025 |
| Linux | kissfft-tools Ubuntu 22.04.1 LTS (jammy) | 131.1.0-2ubuntu0.1~esm1 | [kissfft-tools 131.1.0-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-kissfft-tools-131.1.0-2ubuntu0.1-esm1.md) | Apr 20, 2026 |
| Linux | kissfft-tools Ubuntu 24.04.5 LTS (noble) | 131.1.0-3ubuntu0.1~esm1 | [kissfft-tools 131.1.0-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-kissfft-tools-131.1.0-3ubuntu0.1-esm1.md) | Apr 20, 2026 |
| Linux | kissfft-tools Ubuntu 26.04.1 LTS (resolute) | 131.1.0-4ubuntu0.1~esm1 | [kissfft-tools 131.1.0-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-kissfft-tools-131.1.0-4ubuntu0.1-esm1.md) | Apr 20, 2026 |
| Linux | libkissfft-float131 Ubuntu 22.04.1 LTS (jammy) | 131.1.0-2ubuntu0.1~esm1 | [libkissfft-float131 131.1.0-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libkissfft-float131-131.1.0-2ubuntu0.1-esm1.md) | Apr 20, 2026 |
| Linux | libkissfft-float131 Ubuntu 24.04.5 LTS (noble) | 131.1.0-3ubuntu0.1~esm1 | [libkissfft-float131 131.1.0-3ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libkissfft-float131-131.1.0-3ubuntu0.1-esm1.md) | Apr 20, 2026 |
| Linux | libkissfft-float131 Ubuntu 26.04.1 LTS (resolute) | 131.1.0-4ubuntu0.1~esm1 | [libkissfft-float131 131.1.0-4ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libkissfft-float131-131.1.0-4ubuntu0.1-esm1.md) | Apr 20, 2026 |

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Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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