Bug 2568534 (CVE-2026-104267)

Summary: CVE-2026-104267 botan: Botan: Denial of Service via heap buffer overflow in Scrypt
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Botan. On 32-bit systems, the library's Scrypt algorithm calculates required memory using unchecked arithmetic, which can result in an undersized memory buffer. By providing crafted cryptographic parameters, such as through a malicious encrypted private key, an attacker can trigger an out-of-bounds memory write. This issue typically causes an immediate application crash, leading to a Denial of Service (DoS), and could potentially result in memory corruption.
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Description OSIDB Bzimport 2026-11-06 21:31:37 UTC 
Botan is a C++ cryptography library. From 2.7.0 until 3.13.0, Botan's Scrypt implementation on 32-bit platforms computes required memory with unchecked multiplication, allowing attacker-controlled Scrypt parameters to wrap the allocation size and create a buffer smaller than the algorithm subsequently writes. The issue affects systems that enable Scrypt and accept arbitrary parameters from a hostile source, including applications that decrypt attacker-supplied encrypted private keys. A triggering parameter set can cause approximately four gigabytes of Scrypt output to be written past the allocated heap buffer, immediately crashing the process and causing denial of service. Arbitrary code execution is not demonstrated and appears difficult, but cannot be excluded from the overwrite primitive. This issue is fixed in version 3.13.0.