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TI-2026-82696 Aliases CVE-2026-118765

Predictable RNG seeding in Botan AutoSeeded_RNG after clear()

Priority LOW 33CWE-335Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Botan from 3.7.0 before 3.13.0 contains an incorrect seeding flaw (CWE-335) in AutoSeeded_RNG. After the generator's state is cleared and then randomized with an empty buffer while unseeded, it marks itself seeded without consulting the entropy source, and on builds without the system RNG its fallback uses only a clock value and process ID. A local attacker with low privileges can then predict output from the generator in affected applications.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00145 3rd percentileScored 2026-11-07
Fix Fixed botan (randombit): 3.13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
randombitbotan3.7.0 to before 3.13.03.13.0Patch availableCNA
  • botan Vendorrandombit Affected 3.7.0 to before 3.13.0 Fixed in 3.13.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*——randombit
  • cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:* Versions — — ·randombit

Remediation

Upgrade Botan to version 3.13.0, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-07

  • Fix · CNA botan (randombit) Fixed in 3.13.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 4 products
  • Red Hat Ansible Automation Platform 2
  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 9
  • Red Hat Hardened Images

Timeline

  1. 2026-10-29 Threatist record created from CVE-2026-118765
  2. 2026-10-29 CISA SSVC decision points changed
  3. 2026-10-29 Priority changed: MEDIUM → LOW
  4. 2026-10-30 Affected versions changed · Red Hat
  5. 2026-10-30 CVSS score added · Red Hat
  6. 2026-11-07 Affected versions changed · Red Hat

References

Other 3

  • TI-2024-33818 Botan before 3.6.0, when certain GCC versions are used, has a compiler-induced… CVSS 3.1MEDIUM 5.9
  • TI-2024-33817 Botan before 3.6.0, when certain LLVM versions are used, has compiler-induced… CVSS 3.1MEDIUM 5.9
  • TI-2016-02004 Integer overflow in the PointGFp constructor in Botan before 1.10.11 and 1.11.x before… CVSS 3.0CRITICAL 9.8
  • TI-2016-02005 Heap-based buffer overflow in the P-521 reduction function in Botan 1.11.x before 1.11.27… CVSS 3.0CRITICAL 9.8
  • TI-2026-26828 Botan has a certificate authentication bypass due to trust anchor confusion CVSS 4.0CRITICAL 9.3
  • TI-2016-07479 In Botan 1.8.0 through 1.11.33, when decoding BER data an integer overflow could occur… CVSS 3.0CRITICAL 9.8
See all 43 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences