145 lines
6.7 KiB
JSON
145 lines
6.7 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-69247",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-08-03T19:54:19.852Z",
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"datePublished": "2026-08-03T21:16:32.047Z",
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"dateUpdated": "2026-08-04T14:09:24.615Z"
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},
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"containers": {
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"cna": {
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"title": "cryptography: PKCS#7 EnvelopedData decryption exposes a Bleichenbacher oracle through distinguishable errors and timing",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-208",
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"lang": "en",
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"description": "CWE-208: Observable Timing Discrepancy",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-209",
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"lang": "en",
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"description": "CWE-209: Generation of Error Message Containing Sensitive Information",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"attackVector": "NETWORK",
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"attackComplexity": "HIGH",
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"attackRequirements": "PRESENT",
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"privilegesRequired": "NONE",
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"userInteraction": "NONE",
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"vulnConfidentialityImpact": "HIGH",
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"vulnIntegrityImpact": "NONE",
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"vulnAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
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"baseScore": 8.2,
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
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"version": "4.0"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/pyca/cryptography/security/advisories/GHSA-g6cj-pr64-35w5",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/pyca/cryptography/security/advisories/GHSA-g6cj-pr64-35w5"
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},
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{
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"name": "https://github.com/pyca/cryptography/pull/15369",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/pyca/cryptography/pull/15369"
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},
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{
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"name": "https://github.com/pyca/cryptography/commit/53fccd93413a8d7f07d6d8999681f27b75cffa3f",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/pyca/cryptography/commit/53fccd93413a8d7f07d6d8999681f27b75cffa3f"
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}
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],
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"affected": [
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{
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"vendor": "pyca",
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"product": "cryptography",
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"versions": [
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{
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"version": ">= 44.0.0, < 50.0.0",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-08-03T21:16:32.047Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 44.0.0 until 50.0.0, pkcs7_decrypt_der, pkcs7_decrypt_pem, and pkcs7_decrypt_smime reported the outcome of decrypting a RecipientInfo's encryptedKey in several distinguishable ways, one of which disclosed the exact length recovered from the RSA operation. The same distinction was also observable by timing. An application that decrypts attacker-supplied EnvelopedData and reflects the outcome gives the attacker a Bleichenbacher oracle against the content-encryption key. Decryption ran as RSA PKCS#1 v1.5 decrypt of encryptedKey, build an AES cipher from the result, then AES-CBC decrypt and PKCS#7 unpad. Invalid RSA padding, a valid padding with a bad key length, a correct length with a wrong key, and the real key each failed or succeeded differently. Case 1 is reachable only where the linked library lacks implicit rejection: OpenSSL 3.0 and 3.1, LibreSSL, and BoringSSL. Exploitation requires a service that auto-decrypts untrusted EnvelopedData matching the victim certificate and answers adaptively at high volume, such as an S/MIME gateway or mail filter. This issue is fixed in 50.0.0."
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}
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],
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"source": {
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"advisory": "GHSA-g6cj-pr64-35w5",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-08-04T14:09:18.204828Z",
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"id": "CVE-2026-69247",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-08-04T14:09:24.615Z"
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}
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}
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]
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}
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} |