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Vulnerabilities / CVE-2026-3849

critical

CVE-2026-3849

Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Confi ...

Published Modified CWE 787
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Julia6.9CVSS: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

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Julia (medium).

Description

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 packages and fixed versions

SourcePackageFixed in
alpine 3.23wolfssl5.9.1-r0
alpine 3.24wolfssl5.9.0-r0
alpine edgewolfssl5.9.0-r0
debian 11wolfsslno fix listed
debian 12wolfsslno fix listed
debian 13wolfsslno fix listed
echowolfsslno fix listed
julia::Julia Ecosystem Security AdvisorieswolfSSL_jll5.9.2+0
rapidfort alpine 3.20wolfssl5.9.0-r0
rapidfort alpine 3.21wolfssl5.9.0-r0
rapidfort alpine 3.22wolfssl5.9.0-r0
rapidfort debian 12wolfssl0:5.9.0-0.1
Show all 13 entries from 13 sources
SourcePackageFixed in
alpine 3.23wolfssl5.9.1-r0
alpine 3.24wolfssl5.9.0-r0
alpine edgewolfssl5.9.0-r0
debian 11wolfsslno fix listed
debian 12wolfsslno fix listed
debian 13wolfsslno fix listed
echowolfsslno fix listed
julia::Julia Ecosystem Security AdvisorieswolfSSL_jll5.9.2+0
rapidfort alpine 3.20wolfssl5.9.0-r0
rapidfort alpine 3.21wolfssl5.9.0-r0
rapidfort alpine 3.22wolfssl5.9.0-r0
rapidfort debian 12wolfssl0:5.9.0-0.1
rapidfort debian 13wolfssl0:5.9.0-0.1

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.