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CVE-2026-118765— Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state

Quick assessment

Affected
randombit botan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Botan 是一个 C++ 密码学库。在版本 3.7.0 至 3.13.0 期间，若应用程序在生成器未播种（unseeded）的状态下先调用 ，随后再调用 且传入一个空的输出缓冲区，则可能导致 在未咨询配置的熵源的情况下，错误地将自身标记为已播种。在编译时未启用 的情况下，其回退机制仅依赖时钟值和进程 ID，因此后续的非空请求可能基于可预测的状态生成输出。该问题已在版本 3.13.0 中修复。

CVSS 7.3 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
randombit botan >= 3.7.0, < 3.13.0 affected
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I. Basic Information for CVE-2026-118765

Vulnerability Information
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Vulnerability Title
Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state
Source: CVE Program / CVE List V5
Vulnerability Description
Botan is a C++ cryptography library. From 3.7.0 until 3.13.0, an application that calls AutoSeeded_RNG::clear() and then calls randomize with an empty output buffer while the generator is unseeded can cause AutoSeeded_RNG to mark itself seeded without consulting the configured entropy source. On builds without BOTAN_HAS_SYSTEM_RNG, the fallback uses only a clock value and process ID, so a later non-empty request can produce output from predictable state. This issue is fixed in version 3.13.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
PRNG种子错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
randombit botan >= 3.7.0, < 3.13.0 -

II. Public POCs for CVE-2026-118765

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III. Intelligence Information for CVE-2026-118765

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Other References for CVE-2026-118765 (3)

Same Patch Batch · randombit · 2026-10-29 · 5 CVEs total

CVE-2026-118769 9.2 CRITICAL Botan: Integer overflow when reporting block size in FFI can cause memory corruption
CVE-2026-118766 6.1 MEDIUM Botan: Online OCSP redirects enable blind requests to internal HTTP services
CVE-2026-118768 5.9 MEDIUM Botan: CLI utility `ocsp_check` accepts unauthenticated responses
CVE-2026-118767 4.8 MEDIUM Botan: Python binding bcrypt APIs truncate passwords containing embedded NULs

IV. Related Vulnerabilities

Same product: botan
Same vendor: randombit
Same weakness: CWE-335