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CVE-2026-118765

Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state

7.3 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.14%Unchanged since Oct 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.3

Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state

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.

Record
CVE-2026-118765
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-335
Updated
2026-11-02
EUVDEUVD-2026-113274 7.3

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.

Record
EUVD-2026-113274
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 7.3

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.

Record
CVE-2026-118765
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/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
Weakness
CWE-335
Updated
2026-11-02
OSV 7.3

Botan: AutoSeeded_RNG can become reinitialized from predictable data after clearing state

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.

Record
CVE-2026-118765
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-335
Updated
2026-11-02
OSVDEBIAN-CVE-2026-118765 7.3

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.

Record
DEBIAN-CVE-2026-118765
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-118765 7.3

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.

Record
UBUNTU-CVE-2026-118765
CVSS 4.0
7.3 HighCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
botan
Debian:12
All versions, plus listed versions
2.19.3+dfsg-12.19.3+dfsg-1+deb12u12.19.4+dfsg-12.19.5+dfsg-12.19.5+dfsg-22.19.5+dfsg-32.19.5+dfsg-4
None known
botan
Debian:13
All versions, plus listed versions
2.19.5+dfsg-4
None known
botan3
Debian:13
All versions, plus listed versions
3.10.0+dfsg-13.10.0+dfsg-23.11.0+dfsg-13.11.1+dfsg-13.11.1+dfsg-2
Show 10 moreShow less
3.12.0+dfsg-13.12.0+dfsg-23.12.0+dfsg-2~deb13u13.13.0+dfsg-13.13.0+dfsg-23.7.1+dfsg-23.8.1+dfsg-13.9.0+dfsg-13.9.0+dfsg-23.9.0+dfsg-2.1
None known
botan3
Debian:14
before 3.13.0+dfsg-2, plus listed versions
3.10.0+dfsg-13.10.0+dfsg-23.11.0+dfsg-13.11.1+dfsg-13.11.1+dfsg-2
Show 9 moreShow less
3.12.0+dfsg-13.12.0+dfsg-23.12.0+dfsg-2~deb13u13.13.0+dfsg-13.7.1+dfsg-23.8.1+dfsg-13.9.0+dfsg-13.9.0+dfsg-23.9.0+dfsg-2.1
3.13.0+dfsg-2
botan
Ubuntu:18.04:LTS
All versions, plus listed versions
2.4.0-32.4.0-42.4.0-5ubuntu1
None known
botan
Ubuntu:20.04:LTS
All versions, plus listed versions
2.9.0-22.9.0-2build12.12.1-22.12.1-2build1
None known
botan
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
2.17.3+dfsg-32.19.1+dfsg-2ubuntu12.19.1+dfsg-2ubuntu1+esm1
None known
botan
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
2.19.3+dfsg-1ubuntu12.19.3+dfsg-1ubuntu22.19.3+dfsg-1ubuntu2+esm1
None known

History

History
RecordedChangedSources
factsOSV
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-118765 is a high vulnerability (CVSS 7.3) in Randombit Botan, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in botan3 3.13.0+dfsg-2.

References

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