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CVE Vulnerability Details :

CVE-2026-3849

PUBLISHED

More Info Official Page

Assigner-wolfSSL

Assigner Org ID-50d2cd11-d01a-48ed-9441-5bfce9d63b27

Published At-19 Mar, 2026 | 20:29

Updated At-25 Mar, 2026 | 14:21

▼CVE Numbering Authority (CNA)

Buffer Overflow in HPKE via Oversized ECH Config

Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH (Encrypted Client Hello) support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client program crash. This could be exploited by a malicious TLS server supporting ECH. Note that ECH is off by default, and is only enabled with enable-ech.

Affected Products

Vendor

wolfSSL Inc.

Product

wolfSSL

Default Status

unaffected

Versions

Affected

From v5.6.0-stable through v5.8.4-stable (git)

Problem Types

Type	CWE ID	Description
CWE	CWE-787	CWE-787: Out-of-bounds Write

Type: CWE

CWE ID: CWE-787

Description: CWE-787: Out-of-bounds Write

Metrics

Version	Base score	Base severity	Vector
4.0	6.9	MEDIUM	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/V:D/RE:M/U:Amber

Version: 4.0

Base score: 6.9

Base severity: MEDIUM

Vector:

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/V:D/RE:M/U:Amber

Credits

finder

Haruto Kimura (Stella)

References

Hyperlink	Resource
https://github.com/wolfSSL/wolfssl/pull/9737	N/A

Hyperlink: https://github.com/wolfSSL/wolfssl/pull/9737

Resource: N/A

▼Authorized Data Publishers (ADP)

CISA ADP Vulnrichment

Affected Products

Affected

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Exploits

Credits

Timeline

Replaced By

Rejected Reason

References

Affected Products

Metrics

Metrics Other Info

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Credits

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Rejected Reason

References