Generated remediation guidance and an executive summary. No account required.
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.
Use CWE-193, Botan Project vendor hub and Botan product page to widen CVE-2018-9860 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2021-24115, CVE-2026-34580 and CVE-2022-43705 for nearby disclosures in the same product family.