Bug 2544476 (CVE-2026-103678)

Summary: CVE-2026-103678 tnef: Heap out-of-bounds read in get_rtf_data_from_buf() via uncompressed RTF MAPI value
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in tnef. An attacker can exploit this vulnerability by providing a specially crafted file containing uncompressed Rich Text Format (RTF) data. Because the application fails to properly validate input buffer boundaries before copying data in get_rtf_data_from_buf(), reading beyond the allocated memory occurs. This flaw can cause the application to crash, leading to a Denial of Service (DoS), or leak sensitive memory contents into extracted output files.
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Bug Depends On: 2544594    
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Description OSIDB Bzimport 2026-10-01 09:13:12 UTC 
A flaw was found in tnef. The TNEF uncompressed-RTF value handler in get_rtf_data_from_buf() copies an attacker-controlled uncompr_size number of bytes from the input buffer without validating that the buffer actually contains that much data beyond the 16-byte value header, resulting in a heap out-of-bounds read. The issue was confirmed under AddressSanitizer and can crash the process; when body extraction (--save-body) is enabled, the over-read memory is written into the extracted RTF output file.