openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: berdecodeINTEGER, berdecodeSEQUENCE, berdecodeOCTETSTRING, berdecodeBITSTRING, and berdecodeCHOICE. Additionally, berdecodeINTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as CCreateObject or CUnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.
{
"cwe_ids": [
"CWE-125"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40253.json",
"cna_assigner": "GitHub_M"
}{
"cpe": "cpe:2.3:a:opencryptoki_project:opencryptoki:*:*:*:*:*:*:*:*",
"source": [
"CPE_RANGE",
"REFERENCES"
],
"extracted_events": [
{
"introduced": "0"
},
{
"last_affected": "3.26.0"
}
]
}"2026-07-15T21:57:32Z"
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"id": "CVE-2026-40253-81c2ffe7",
"signature_version": "v1",
"digest": {
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"length": 5349.0
}
},
{
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"target": {
"file": "usr/lib/common/asn1.c",
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},
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"source": "https://github.com/opencryptoki/opencryptoki/commit/ed378f463ef73364c89feb0fc923f4dc867332a3",
"id": "CVE-2026-40253-826a7fa8",
"signature_version": "v1",
"digest": {
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"length": 2789.0
}
},
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