CVE-2026-75818: Heap Buffer Overflow in GNU Aspell's prezip utility
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.
Other sources
Heap Buffer Overflow in GNU Aspell's prezip utility
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
GNU Aspell prezip-binto a version that resolves this vulnerability.Fixed in 0.60.8.3Patch 15b188437f9e0192d4ac4472ad66a4e2f62a782f
Event History
Frequently Asked Questions
Who is exposed to this issue?
Users or systems that run GNU Aspell's prezip-bin decompressor on compressed files supplied by an untrusted source are exposed. Exploitation requires convincing a user to process a crafted compressed file.
What impact is documented for successful exploitation?
Processing a malicious compressed file can cause heap out-of-bounds reads and writes, resulting in memory corruption and a process crash. The provided information does not document code execution or privilege escalation.
Which release contains the fix?
The issue was fixed in commit 15b188437f9e0192d4ac4472ad66a4e2f62a782f and is stated to be released in GNU Aspell version 0.60.8.3.