# CVE-2026-75818: Heap Buffer Overflow in GNU Aspell's prezip utility

CVE-2026-75818 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-75818, released November 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-75818
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0015
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 6, 2026
- Weakness: Heap-based Buffer Overflow
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-75818

## Description

GNU Aspell prezip-bin contains a heap-based buffer overflow vulnerability in the decompressor in prog/prezip.c. The decompressor does not properly check buffer space, so a crafted compressed file can cause out-of-bounds read and write operations on the heap. An attacker who convinces a user to process a malicious compressed file with prezip-bin can trigger memory corruption, leading to a processs crash.    This issue was fixed in commit 15b188437f9e0192d4ac4472ad66a4e2f62a782f which will be released in version 0.60.8.3.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | aspell Debian 14 | 0.60.8.2-4 | [DEBIAN-CVE-2026-75818](https://patchblox.com/security/data/fix/linux/debian-cve-2026-75818.md) | Nov 1, 2026 |
| Linux | aspell amzn 2023 | 12:0.60.8-7.amzn2023.0.3 | [ALAS2023-2026-3275](https://patchblox.com/security/data/fix/linux/alas2023-2026-3275.md) | Nov 7, 2026 |
| Linux | aspell-debuginfo amzn 2023 | 12:0.60.8-7.amzn2023.0.3 | [ALAS2023-2026-3275](https://patchblox.com/security/data/fix/linux/alas2023-2026-3275.md) | Nov 7, 2026 |
| Linux | aspell-debugsource amzn 2023 | 12:0.60.8-7.amzn2023.0.3 | [ALAS2023-2026-3275](https://patchblox.com/security/data/fix/linux/alas2023-2026-3275.md) | Nov 7, 2026 |
| Linux | aspell-devel amzn 2023 | 12:0.60.8-7.amzn2023.0.3 | [ALAS2023-2026-3275](https://patchblox.com/security/data/fix/linux/alas2023-2026-3275.md) | Nov 7, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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