CVE-2026-48101
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
7-Zip, a file archiver, contains an uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in versions 9.21 through 26.00. The OpenCapsule function allocates a heap buffer without zero-initialization, which may lead to unauthorized data exposure.
Risk Assessment
Organizations may be exposed to the disclosure of sensitive information, potentially leading to privacy breaches and data security issues. Users may inadvertently access unauthorized data from memory.
Recommendation
It is recommended to update to version 26.0.1 or later to mitigate this vulnerability. Additionally, organizations should monitor and assess potential risks associated with using older software versions.
Other vulnerabilities in 7-Zip
See all- CVE-2026-48112Medium
7-Zip versions 9.18 through 26.00 contain a heap out-of-bounds read vulnerability in the BSD SYMDEF parser. The ParseLibSymbols function reads data beyond the allocated memory area, potentially leading to leakage of uninitialized data.
- CVE-2026-48104Medium
7-Zip versions 9.18 through 26.00 contain a vulnerability in the SquashFS archive handler, involving an uninitialized heap read. This issue occurs when processing images with few inodes, potentially leading to memory information disclosure.
- CVE-2026-48095High
7-Zip versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer. Attackers may exploit this vulnerability to execute arbitrary code or cause application crashes.
- CVE-2026-48092Medium
7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain a heap memory disclosure due to an integer overflow in the SquashFS ReadBlock function on 32-bit builds.
- CVE-2025-53816High
7-Zip is a file archiver with a high compression ratio. Versions of 7-Zip prior to 25.0.0 have an issue with writing zeroes outside the heap buffer in the RAR5 handler, which may lead to memory corruption and denial of service.
- CVE-2026-14266High
In 7-Zip, a heap-based buffer overflow vulnerability exists in XZ decompression that allows remote code execution. User interaction is required – the victim must visit a malicious page or open a malicious file. Crafted XZ-compressed data can trigger a heap-based buffer overflow.
- CVE-2026-58052Low
7-Zip for Windows up to version 26.01 fails to preserve the Mark-of-the-Web when extracting a crafted RAR5 archive. Its guard that suppresses an archive-supplied Zone.Identifier stream matches the exact name 'Zone.Identifier' while a RAR5 STM record named ':Zone.Identifier:$DATA' is not matched and NTFS canonicalizes it to the same stream, overwriting the propagated Internet-zone marker with ZoneId=0. A second STM record named '::$DATA' overwrites the extracted file's default data stream, letting an attacker defeat SmartScreen/MotW warnings and spoof file content.
Original NVD description (English source)
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.