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An issue was discovered in Botan 1.11.32 through 2.x before 2.6.0. An off-by-one error when processing malformed TLS-CBC ciphertext could cause the receiving side to include in the HMAC computation exactly 64K bytes of data following the record buffer, aka an over-read. The MAC comparison will subsequently fail and the connection will be closed. This could be used for denial of service. No information leak occurs.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade botan | Aug 22, 2024 | Apr 12, 2018 |
| Debian | — | Upgrade botan | Jul 30, 2024 | Apr 12, 2018 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Apr 12, 2018 |
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