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CVE-2026-118769critical9.2

Botan: Integer overflow when reporting block size in FFI can cause memory corruption

Impact

Botan, a C++ cryptography library, has an integer overflow vulnerability in its C API function botan_block_cipher_block_size, affecting versions 2.1.0 to 3.13.0. An attacker with access to the FFI raw ECB mode can cause memory corruption. The C++ API and certain C API modes are unaffected.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

randombit · GitHub_M

botan

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

>= 2.1.0, < 3.13.0

unaffected

unknown

Other versions: unknown

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-118769

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-125 ↗

CWE-125: Out-of-bounds Read

GitHub_M

Related →
CWE-681 ↗

CWE-681: Incorrect Conversion between Numeric Types

GitHub_M

Related →
CWE-787 ↗

CWE-787: Out-of-bounds Write

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-10-29
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
  1. CVE · CVE-2026-118769

    Observed 2026-10-29T21:08:07.870Z · upstream updated 2026-10-29T20:21:04.235Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-10-29T20:20:31.067238Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "total"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

3 sources
github.com/randombit/botan/security/advisories/GHSA-c68p-822g-jfvr
Security advisoryGitHub_M
github.com/randombit/botan/pull/5805
PatchGitHub_M
github.com/randombit/botan/commit/c6089ab7fab616517d56c447c93e13a5c57a0af3
PatchGitHub_M