CVE-2026-0819

LOW EPSS 1.1%

Published Mar 19, 20263mo ago · Modified Jun 17, 20261w ago

2.2 CVSS 4.0

Low

Published Mar 19, 2026 3mo ago

Last Modified Jun 17, 2026 1w ago

Description

A stack buffer overflow vulnerability exists in wolfSSL's PKCS7 SignedData encoding functionality. In wc_PKCS7_BuildSignedAttributes(), when adding custom signed attributes, the code passes an incorrect capacity value (esd->signedAttribsCount) to EncodeAttributes() instead of the remaining available space in the fixed-size signedAttribs[7] array. When an application sets pkcs7->signedAttribsSz to a value greater than MAX_SIGNED_ATTRIBS_SZ (default 7) minus the number of default attributes already added, EncodeAttributes() writes beyond the array bounds, causing stack memory corruption. In WOLFSSL_SMALL_STACK builds, this becomes heap corruption. Exploitation requires an application that allows untrusted input to control the signedAttribs array size when calling wc_PKCS7_EncodeSignedData() or related signing functions.

CVSS Details

Base Score

2.2

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/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

Attack Vector Local

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

1.1% percentile

Exploit & Patch Status

No Known Exploit

Patch Available

Weaknesses 2

CWE-121

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 1

Vendor	Product	Version	Range
wolfssl	wolfssl	*	≥5.5.0 – <5.9.0

References 1

github.com https://github.com/wolfSSL/wolfssl/pull/9630

Issue TrackingPatch

Remediation

github.com https://github.com/wolfSSL/wolfssl/pull/9630

Issue TrackingPatch