CVE-2026-0819
- Source
- https://cve.org/CVERecord?id=CVE-2026-0819
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-0819.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-0819
- Downstream
- Published
- 2026-03-19T16:54:33Z
- Modified
- 2026-08-12T03:51:28Z
- Severity
-
- 2.2 (Low) CVSS_V4 - 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 CVSS Calculator
- Summary
- Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes
- Details
-
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.
- Database specific
{ "cna_assigner": "wolfSSL", "cwe_ids": [ "CWE-121", "CWE-787" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/0xxx/CVE-2026-0819.json" }- References