CVE-2026-118769 - Botan：在 FFI 報告區塊大小時的整數溢位可能造成記憶體損毀
CVE-2026-118769 - Botan: Integer overflow when reporting block size in FFI can cause memory corruption
Botan 是一個 C++ 加密庫，存在於 2.1.0 至 3.13.0 版本的 botan_block_cipher_block_size 函式中，將 size_t 轉為 int 時未做邊界檢查，易導致記憶體破壞。
此漏洞可能導致記憶體破壞，升級 Botan 至 3.13.0 可修補；避免使用 FFI 原始 ECB 模式以減低風險。
Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that accepts external algorithm parameter strings and uses the FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher so that the reported size is truncated, the caller allocates insufficient memory, and later block processing causes memory corruption. The C++ API and normally used C API modes such as CBC and CTR are unaffected. This issue is fixed in version 3.13.0.
Impact
Affected Products
The following products are affected by CVE-2026-118769
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
| ID | Vendor | Product | Action |
|---|---|---|---|
| 1 | Botan_project | botan |
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | [email protected] |
Update Botan to version 3.13.0 to fix memory corruption due to unchecked size conversion.
- Update Botan to version 3.13.0 or later.
- Avoid using FFI raw ECB mode with variable block ciphers.
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Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by [email protected]
十月. 29, 2026
Action Type Old Value New Value Added Description Botan is a C++ cryptography library. From 2.1.0 until 3.13.0, the Botan C API function botan_block_cipher_block_size converted a size_t block size to int without a bounds check. In an application that accepts external algorithm parameter strings and uses the FFI raw ECB mode, an attacker can select the variable-block-size Lion cipher so that the reported size is truncated, the caller allocates insufficient memory, and later block processing causes memory corruption. The C++ API and normally used C API modes such as CBC and CTR are unaffected. This issue is fixed in version 3.13.0. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-125 Added CWE CWE-787 Added CWE CWE-681 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/118xxx/CVE-2026-118769.json">CVE-2026-118769</a> Added Reference https://github.com/randombit/botan/commit/c6089ab7fab616517d56c447c93e13a5c57a0af3 Added Reference https://github.com/randombit/botan/pull/5805 Added Reference https://github.com/randombit/botan/security/advisories/GHSA-c68p-822g-jfvr
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.