CVE-2026-39856

The record

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.13, an out-of-bounds read vulnerability exists in osslsigncode version 2.12 and earlier in the PE page-hash computation code (pe_page_hash_calc()). When processing PE sections for page hashing, the function uses PointerToRawData and SizeOfRawData values from section headers without validating that the referenced region lies within the mapped file. An attacker can craft a PE file with section headers that point beyond the end of the file. When osslsigncode computes page hashes for such a file, it may attempt to hash data from an invalid memory region, causing an out-of-bounds read and potentially crashing the process. The vulnerability can be triggered while signing a malicious PE file with page hashing enabled (-ph), or while verifying a malicious signed PE file that already contains page hashes. Verification of an already signed file does not require the verifier to pass -ph. This vulnerability is fixed in 2.13.

Affected packages

Related vulnerabilities

• CVE-2026-92824 A flaw was found in libmodulemd. CWE-125
• CVE-2026-114038 A flaw was found in device-mapper-multipath. CWE-125
• CVE-2026-112896 Pillow is a Python imaging library. CWE-125
• CVE-2026-112278 rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in… CWE-125
• CVE-2026-112273 libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name… CWE-125
• CVE-2026-112073 A vulnerability was identified in Tencent ncnn up to 44b02dabdcf97499281a4692ebd65bad73dc… CWE-125
• CVE-2026-112020 LodePNG through 20261006 contains a heap out-of-bounds read vulnerability in… CWE-125
• CVE-2026-88842 A flaw was found in BusyBox dpkg. CWE-125