CVE-2026-5778
Integer underflow leads to out-of-bounds access in sniffer ChaCha decrypt path.
Summary
Integer underflow leads to out-of-bounds access in sniffer ChaCha decrypt path.
Original description
The description as published by the source.
Integer underflow in wolfSSL packet sniffer <= 5.9.0 allows an attacker to cause a program crash in the AEAD decryption path by injecting a TLS record shorter than the explicit IV plus authentication tag into traffic inspected by ssl_DecodePacket. The underflow wraps a 16-bit length to a large value that is passed to AEAD decryption routines, causing a large out-of-bounds read and crash. An unauthenticated attacker can trigger this remotely via malformed TLS Application Data records.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-5778 wolfssl
- Ubuntu UBUNTU-CVE-2026-5778 wolfssl
References
- advisory github.com
- advisory nvd.nist.gov
- patch github.com