CVE-2026-6094

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData

6.3 MediumFix available

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.52%Up 0.3 points since Jun 26, 2026

What each source reports

CVE List Score used 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: CVE-2026-6094
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-125
Updated: 2026-11-02

EUVDEUVD-2026-39480 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: EUVD-2026-39480
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-h6gc-rmv2-74g6 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData....

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: GHSA-h6gc-rmv2-74g6
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

NVD 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: CVE-2026-6094
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness: CWE-125
Updated: 2026-11-02

OSVALPINE-CVE-2026-6094 9.1

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: ALPINE-CVE-2026-6094
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated: 2026-11-03

OSV 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: CVE-2026-6094
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-125
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-6094 9.1

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: DEBIAN-CVE-2026-6094
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated: 2026-11-02

OSVJLSEC-2026-744 6.3

Heap buffer overread in `wc_PKCS7_DecodeEnvelopedData` when parsing crafted PKCS7 EnvelopedData

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: JLSEC-2026-744
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-6094 6.3

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

Record: UBUNTU-CVE-2026-6094
CVSS 4.0: 6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated: 2026-11-02

Affected products

wolfssl

Affected packages

Affected packages
Package	Affected	Fixed
`wolfssl` Alpine:v3.24	5.8.0 up to 5.9.2-r0	5.9.2-r0
`wolfssl` Debian:12	before 5.5.4-2+deb12u3, plus listed versions 5.5.4-25.5.4-2+deb12u15.5.4-2+deb12u2	5.5.4-2+deb12u3
`wolfssl` Debian:13	before 5.7.2-0.1+deb13u2, plus listed versions 5.7.2-0.15.7.2-0.1+deb13u1	5.7.2-0.1+deb13u2
`wolfSSL_jll` Julia	5.8.4+0 up to 5.9.2+0	5.9.2+0
`wolfssl` Ubuntu:16.04:LTS	All versions, plus listed versions 3.4.8+dfsg-1	None known
`wolfssl` Ubuntu:18.04:LTS	All versions, plus listed versions 3.10.2+dfsg-23.12.0+dfsg-13.12.2+dfsg-13.13.0+dfsg-1	None known
`wolfssl` Ubuntu:20.04:LTS	All versions, plus listed versions 4.1.0+dfsg-24.2.0+dfsg-14.2.0+dfsg-24.2.0+dfsg-34.3.0+dfsg-2	None known
`wolfssl` Ubuntu:22.04:LTS	All versions, plus listed versions 4.6.0-35.0.0-15.1.1-15.2.0-15.2.0-2	None known
`wolfssl` Ubuntu:24.04:LTS	All versions, plus listed versions 5.5.4-25.5.4-2.15.6.4-25.6.6-1.25.6.6-1.35.6.6-1.3build1	None known
`wolfssl` Ubuntu:25.10	All versions, plus listed versions 5.7.2-0.1	None known
`wolfssl` Ubuntu:26.10	All versions, plus listed versions 5.9.1-0.15.9.2-1	None known
`wolfssl` Ubuntu:26.04:LTS	All versions, plus listed versions 5.7.2-0.15.8.2-1.25.8.4-15.9.1-0.1	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	affected, aliases, references	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-6094 is a medium vulnerability (CVSS 6.3) in Wolfssl, published June 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.52%, the 44th percentile. Fixed in wolfssl 5.9.2-r0.

References

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