# CVE-2026-41445: KissFFT Integer Overflow Heap Buffer Overflow via kiss_fftndr_alloc()

CVE-2026-41445 is fixed in 3 products on 1 platform, first by kissfft-tools 131.1.0-2ubuntu0.1~esm1, released April 20, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-41445
- Priority: High
- CVSS: 8.8 (Important)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 20, 2026
- Weakness: Integer Overflow or Wraparound
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41445

## Description

KissFFT before commit 8a8e66e contains an integer overflow vulnerability in the kiss_fftndr_alloc() function in kiss_fftndr.c where the allocation size calculation dimOther*(dimReal+2)*sizeof(kiss_fft_scalar) overflows signed 32-bit integer arithmetic before being widened to size_t, causing malloc() to allocate an undersized buffer. Attackers can trigger heap buffer overflow by providing crafted dimensions that cause the multiplication to exceed INT_MAX, allowing writes beyond the allocated buffer region when kiss_fftndr() processes the data.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kissfft Debian 12.15 (bookworm) | 131.1.0-4.1~deb12u1 | [DEBIAN-CVE-2026-41445](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41445.md) | May 15, 2026 |
| Linux | kissfft Debian 13.5 (trixie) | 131.1.0-4.1~deb13u1 | [DEBIAN-CVE-2026-41445](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41445.md) | May 15, 2026 |
| Linux | kissfft Debian 14 | 131.1.0-4.1 | [DEBIAN-CVE-2026-41445](https://patchblox.com/security/data/fix/linux/debian-cve-2026-41445.md) | May 15, 2026 |
| 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 |

---

Data as of 2026-11-08T06:59:42Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.