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Vulnerabilities / CVE-2026-3549

critical

CVE-2026-3549

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ...

Published Modified CWE 122
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
Julia8.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L

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

Description

Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.

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.