CVE-2026-5778 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-08 | Published 2026-04-09 | Updated 2026-04-10 | Assigner wolfSSL

LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-191 Integer underflow (wrap or wraparound)

Product status

Default status

unaffected

Any version

affected

Credits

Zou Dikai finder

References

github.com/wolfSSL/wolfssl/pull/10125

cve.org (CVE-2026-5778)

nvd.nist.gov (CVE-2026-5778)

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