GNU Aspell decompressor prog/prezip.c buffer overflow

Summaryinfo

A vulnerability was found in GNU Aspell. It has been declared as critical. This issue affects some unknown processing of the file prog/prezip.c of the component decompressor. Executing a manipulation can lead to buffer overflow. The identification of this vulnerability is CVE-2026-75818. The attack may be launched remotely. There is no exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability classified as critical was found in GNU Aspell (version now known). This vulnerability affects some unknown processing of the file prog/prezip.c of the component decompressor. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at cert.pl. This vulnerability was named CVE-2026-75818 since 08/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Applying the patch 15b188437f9e0192d4ac4472ad66a4e2f62a782f is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-93364). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• GNU

Name

• Aspell

License

• open-source

Website

• Vendor: https://www.gnu.org/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion