CVE-2026-0819

Memory corruption via incorrect signed-attribute capacity

Published Mar 19, 2026 · Updated Mar 19, 2026

Stack buffer overflow in wolfSSL 5.5.0 through 5.8.4 allows attackers to corrupt memory through custom PKCS7 signed attributes. wc_PKCS7_BuildSignedAttributes passes the current attribute count, rather than remaining signedAttribs[7] capacity, to EncodeAttributes. The condition requires an application to let untrusted input control more than seven attributes; WOLFSSL_SMALL_STACK builds corrupt heap memory.

CVSS severity7.1
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in wolfSSL 5.5.0 through 5.8.4 allows attackers to corrupt memory through custom PKCS7 signed attributes. wc_PKCS7_BuildSignedAttributes passes the current attribute count, rather than remaining signedAttribs[7] capacity, to EncodeAttributes. The condition requires an application to let untrusted input control more than seven attributes; WOLFSSL_SMALL_STACK builds corrupt heap memory.

The record

CVE
CVE-2026-0819
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
wolfSSL
Product
wolfSSL
Classifications
CWE-787, CWE-121
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5.0 <5.9.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

wolfSSL · wolfSSLversion=5.5.0 <5.9.0

Published CVSS scores

2.2wolfSSL Inc.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
7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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