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CVE-2026-6681— PKCS#7 decode ignores caller output buffer size, writing past buffer bounds

AI Predicted 8.1 Difficulty: Moderate EPSS 0.20% · P10

Possible ATT&CK Techniques 1AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-6681

Vulnerability Information
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Vulnerability Title
PKCS#7 decode ignores caller output buffer size, writing past buffer bounds
Source: NVD (National Vulnerability Database)
Vulnerability Description
The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
wolfSSLwolfSSL 3.10.0 ~ 5.9.0 -

II. Public POCs for CVE-2026-6681

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III. Intelligence Information for CVE-2026-6681

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Patches & Fixes for CVE-2026-6681 (1)

Vendor Pages for CVE-2026-6681 (1)

Same Patch Batch · wolfSSL · 2026-06-25 · 32 CVEs total

CVE-2026-6329PKCS#12 MAC verification uses attacker-controlled comparison length
CVE-2026-55958Renesas TSIP TLS 1.3 transcript buffer out-of-bounds write in tsip_StoreMessage
CVE-2026-55960Un-negotiated Raw Public Key (RFC 7250) accepted in place of X.509, bypassing chain valida
CVE-2026-55967AES-GCM streaming APIs do not reject >64 GiB cumulative single messages, enabling counter
CVE-2026-55961wolfSSL_PKCS7_verify() reports success for degenerate (certs-only) PKCS#7 with no signer
CVE-2026-55962TLS 1.3 post-handshake authentication: server accepts Finished without client Certificate/
CVE-2026-55964Chain intermediate CA:TRUE without keyCertSign accepted as a signing CA (temporary CA exem
CVE-2026-8720HMAC-BLAKE2 final discards message when key length exceeds block size
CVE-2026-12340Out-of-bounds heap read in SM2/SM3 certificate Subject Key Identifier computation
CVE-2026-10512X25519 x86_64 assembly final reduction leaves non-canonical field element
CVE-2026-10097ML-KEM-1024 x64 AVX2 incomplete cipher text comparison enables IND-CCA2 break and static p
CVE-2026-10098OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status
CVE-2026-10592Wildcard DNS SAN bypasses CA name-constraint checks
CVE-2026-11310X.509 trust-chain bypass in wolfSSL_X509_verify_cert() via untrusted intermediate anchorin
CVE-2026-11703Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption
CVE-2026-11999X.509 trust-chain bypass via path-depth exhaustion in wolfSSL_X509_verify_cert()
CVE-2026-7532iPAddress name constraints not enforced when WOLFSSL_IP_ALT_NAME is undefined
CVE-2026-6679DTLS 1.3 ACK serialization heap buffer overflow via integer truncation
CVE-2026-6094Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData
CVE-2026-6731X.509 name constraint bypass via Subject CN treated as a DNS name

Showing top 20 of 32 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: wolfSSL
Same vendor: wolfSSL
Same weakness: CWE-787

V. Comments for CVE-2026-6681

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