126 lines
5.3 KiB
JSON
126 lines
5.3 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-2026-41319",
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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": "2026-04-20T14:01:46.671Z",
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"datePublished": "2026-04-24T03:07:24.335Z",
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"dateUpdated": "2026-04-25T01:46:35.002Z"
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},
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"containers": {
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"cna": {
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"title": "MailKit has STARTTLS Response Injection via unflushed stream buffer that enables SASL mechanism downgrade",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-74",
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"lang": "en",
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"description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
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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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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "NETWORK",
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"availabilityImpact": "NONE",
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"baseScore": 6.5,
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"baseSeverity": "MEDIUM",
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"confidentialityImpact": "NONE",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "REQUIRED",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
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"version": "3.1"
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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/jstedfast/MailKit/security/advisories/GHSA-9j88-vvj5-vhgr",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/jstedfast/MailKit/security/advisories/GHSA-9j88-vvj5-vhgr"
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}
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],
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"affected": [
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{
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"vendor": "jstedfast",
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"product": "MailKit",
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"versions": [
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{
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"version": "< 4.16.0",
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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": "2026-04-24T03:07:24.335Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "MailKit is a cross-platform mail client library built on top of MimeKit. A STARTTLS Response Injection vulnerability in versions prior to 4.16.0 allows a Man-in-the-Middle attacker to inject arbitrary protocol responses across the plaintext-to-TLS trust boundary, enabling SASL authentication mechanism downgrade (e.g., forcing PLAIN instead of SCRAM-SHA-256). The internal read buffer in `SmtpStream`, `ImapStream`, and `Pop3Stream` is not flushed when the underlying stream is replaced with `SslStream` during STARTTLS upgrade, causing pre-TLS attacker-injected data to be processed as trusted post-TLS responses. Version 4.16.0 patches the issue."
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}
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],
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"source": {
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"advisory": "GHSA-9j88-vvj5-vhgr",
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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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"references": [
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{
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"url": "https://github.com/jstedfast/MailKit/security/advisories/GHSA-9j88-vvj5-vhgr",
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"tags": [
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"exploit"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-04-25T01:46:14.462850Z",
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"id": "CVE-2026-41319",
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"options": [
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{
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"Exploitation": "poc"
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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": "2026-04-25T01:46:35.002Z"
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}
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}
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]
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}
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} |