PeaZip up to 11.2.x PEA Archive Extraction Routine pea.pas unpea_procedure out-of-bounds write

Summaryinfo

A vulnerability, which was classified as critical, has been found in PeaZip up to 11.2.x. This affects the function unpea_procedure of the file pea.pas of the component PEA Archive Extraction Routine. The manipulation leads to out-of-bounds write. This vulnerability is referenced as CVE-2026-102514. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in PeaZip up to 11.2.x. This issue affects the function unpea_procedure of the file pea.pas of the component PEA Archive Extraction Routine. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Out-of-bounds Write (CWE-787) in the PEA archive extraction routine (pea.pas, unpea_procedure) of the first-party pea component in PeaZip 11.2.0 and earlier allows an attacker who convinces a victim to open or extract a crafted .pea archive to execute arbitrary code as the user running PeaZip. While decompressing a PCOMPRESS1 stream, the 32-bit compressed-block-size field of the first block (compsize) is read directly from the archive and used without validation as the length of a blockread into the fixed-size global buffers wbuf1/wbuf2 (1,114,112 bytes) and as the bound of the subsequent copy loop. The existing check "compsize > WBUFSIZE" is applied only to the size of each following block, so the first block escapes it; the same unvalidated value is also used to index wbuf1[compsize], an out-of-bounds read at an attacker-chosen offset. The copy loop additionally copies the requested length instead of the number of bytes actually read, and terminates on equality rather than on an upper bound. Because the project is built without range checking and no archive password, integrity tag or non-default configuration is required, the overflow overwrites adjacent global data; code execution was demonstrated by two independent researchers against the official Linux x86-64 and Windows x64 builds, and the denial-of-service and memory-corruption primitive is cross-platform (Windows, macOS, Linux, BSD).

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-102514 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 11.3.0 eliminates this vulnerability.

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Productinfo

Name

• PeaZip

Version

• 11.0
• 11.1
• 11.2

Website

• Product: https://github.com/peazip/PeaZip/

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