CVE-2019-11840: Debian Linux

Medium severity, CVSS 5.9. EPSS: 3.5% chance of exploitation in the next 30 days.

An issue was discovered in the supplementary Go cryptography library, golang.org/x/crypto, before v0.0.0-20190320223903-b7391e95e576. A flaw was found in the amd64 implementation of the golang.org/x/crypto/salsa20 and golang.org/x/crypto/salsa20/salsa packages. If more than 256 GiB of keystream is generated, or if the counter otherwise grows greater than 32 bits, the amd64 implementation will first generate incorrect output, and then cycle back to previously generated keystream. Repeated keystream bytes can lead to loss of confidentiality in encryption applications, or to predictability in CSPRNG applications.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Golang Crypto: affected versions not specified

Published 2019-05-09. Last modified 2026-06-17.