7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user.
Metrics
Affected Vendors & Products
References
History
Mon, 19 Oct 2026 20:30:00 +0000
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ssvc
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Sat, 17 Oct 2026 04:30:00 +0000
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7-zip
7-zip 7-zip |
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7-zip
7-zip 7-zip |
Wed, 14 Oct 2026 14:15:00 +0000
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| Description | 7-Zip before 26.03 contains an uninitialized memory disclosure vulnerability in the SquashFS v4 archive handler (SquashfsHandler.cpp) that allows attackers to leak heap memory by crafting a malicious archive where the superblock’s no_ids field is set so that the final metadata block’s expected size is miscomputed and bypasses the size validation check. By listing or extracting the crafted archive, attackers can cause the application to return uninitialized heap memory as the kpidUserId and kpidGroupId properties, exposing potentially sensitive process memory contents to the user. | |
| Title | 7-Zip < 26.03 SquashFS Uninitialized Memory Disclosure via UID/GID Table | |
| Weaknesses | CWE-908 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-10-14T14:06:14.543Z
Updated: 2026-10-19T19:06:48.652Z
Reserved: 2026-10-01T18:02:50.085Z
Link: CVE-2026-104086
Updated: 2026-10-19T19:06:44.339Z
Status : Awaiting Analysis
Published: 2026-10-14T14:17:30.670
Modified: 2026-10-19T20:17:43.990
Link: CVE-2026-104086
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