CVE-2026-1005

NameCVE-2026-1005
DescriptionInteger underflow in wolfSSL packet sniffer <= 5.8.4 allows an attacker to cause a buffer overflow 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 heap buffer overflow and a crash. An unauthenticated attacker can trigger this remotely via malformed TLS Application Data records.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
wolfssl (PTS)bullseye4.6.0+p1-0+deb11u2vulnerable
bookworm5.5.4-2+deb12u2vulnerable
trixie5.7.2-0.1+deb13u1vulnerable
forky5.8.4-1vulnerable
sid5.9.0-0.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
wolfsslsource(unstable)5.9.0-0.1

Notes

https://github.com/wolfSSL/wolfssl/pull/9571
Fixed by: https://github.com/wolfSSL/wolfssl/commit/ca7899429844e8bd3824fe92a709978b51f750c4 (v5.9.0-stable)

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