CVE-2026-0819 - Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes

CVE-2026-0819 - Stack buffer overflow in PKCS7 SignedData encoding with custom signed attributes

https://cvefeed.io/rssfeed/latest.atom / Thu, 03/19/2026 - 20:07
CVE ID :CVE-2026-0819
Published : March 19, 2026, 5:16 p.m. | 1 hour, 45 minutes 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.
Severity: 2.2 | LOW
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