Bug 2485485 (CVE-2026-48102) - CVE-2026-48102 7-Zip: 7-Zip: Information disclosure and denial of service via crafted UDF image
Summary: CVE-2026-48102 7-Zip: 7-Zip: Information disclosure and denial of service via...
Keywords:
Status: NEW
Alias: CVE-2026-48102
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2485489 2485491
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-05 16:01 UTC by OSIDB Bzimport
Modified: 2026-06-05 16:15 UTC (History)
0 users

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Description OSIDB Bzimport 2026-06-05 16:01:27 UTC
7-Zip is a file archiver with a high compression ratio. Versions 9.11 through 26.00 contain a heap out-of-bounds read of up to 3 bytes in the UDF disc image handler's File Identifier Descriptor parser. In CFileId::Parse (CPP/7zip/Archive/Udf/UdfIn.cpp), after validating size < 38 + idLen + impLen and advancing processed to 38 + impLen + idLen, the alignment-padding loop reads p[processed] while incrementing up to 3 times to reach a 4-byte boundary, and the processed <= size bounds check only runs after the loop. When (38 + impLen + idLen) % 4 != 0 and 38 + impLen + idLen == size, the loop reads 1 to 3 bytes past the end of the exact-size heap buffer allocated via buf.Alloc((size_t)item.Size). The UDF handler is registered for .iso and .udf files and auto-detected by signature, and the OOB read triggers during Open() when listing or extracting a crafted UDF image. Impact is limited to information disclosure (a 1-bit oracle per OOB byte via open/fail behavior) and denial of service (crash under hardened allocators); there is no write primitive. Version 26.01 fixes the issue.


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