159 lines
8.4 KiB
JSON
159 lines
8.4 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-2026-56386",
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"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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"state": "PUBLISHED",
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"assignerShortName": "apache",
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"dateReserved": "2026-06-21T04:43:24.873Z",
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"datePublished": "2026-10-21T11:37:47.458Z",
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"dateUpdated": "2026-10-21T13:07:53.942Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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"shortName": "apache",
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"dateUpdated": "2026-10-21T11:37:47.458Z"
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},
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"title": "Apache bRPC: Integer Underflow and Out-of-Bounds Read in HTTP/2 DATA Frame Parser",
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"problemTypes": [
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{
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"descriptions": [
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{
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"description": "CWE-191 Integer Underflow",
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"lang": "en",
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"cweId": "CWE-191",
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"type": "CWE"
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},
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{
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"description": "CWE-125 Out-of-bounds Read",
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"lang": "en",
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"cweId": "CWE-125",
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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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"source": {
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"discovery": "EXTERNAL"
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},
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"affected": [
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{
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"vendor": "Apache Software Foundation",
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"product": "Apache bRPC",
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"packageURL": "pkg:github/apache/brpc",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "1.18.0",
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected",
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"collectionURL": "https://github.com",
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"packageName": "apache/brpc"
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}
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],
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"descriptions": [
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{
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"value": "Integer underflow and out-of-bounds read in the HTTP/2 server DATA frame parser in Apache bRPC allows an unauthenticated remote attacker to cause denial of service by sending a malformed DATA frame with the PADDED flag set and a zero-length payload.\n\nRoot Cause:\nThe HTTP/2 DATA frame handler computed the fragment size from the attacker-controlled payload length and, when the PADDED flag was present, decremented the fragment size before ensuring that the frame contained the mandatory pad length byte. A zero-length padded DATA frame could therefore underflow the unsigned fragment size and read the pad length byte past the end of the frame buffer.\n\nAffected Scenarios:\nApache bRPC servers that accept HTTP/2 traffic are affected when a remote client can send crafted HTTP/2 frames to the server. HTTP/2 may be reached through cleartext h2c detection on an HTTP port or through TLS ALPN negotiation.\n\nHow to Fix:\n(Choose one of the following options)\n1. Upgrade Apache bRPC to version 1.18.0, which fixes this issue.\n2. Apply this patch: https://github.com/apache/brpc/pull/3325 \n\nNote:\nThe fix validates that a padded DATA frame has enough payload bytes for the pad length field before decrementing the fragment size or reading the pad length byte. Malformed zero-length padded DATA frames are rejected with HTTP/2 FRAME_SIZE_ERROR.",
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"lang": "en",
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"supportingMedia": [
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{
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"type": "text/html",
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"base64": false,
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"value": "Integer underflow and out-of-bounds read in the HTTP/2 server DATA frame parser in Apache bRPC allows an unauthenticated remote attacker to cause denial of service by sending a malformed DATA frame with the PADDED flag set and a zero-length payload.<br><br>Root Cause:<br>The HTTP/2 DATA frame handler computed the fragment size from the attacker-controlled payload length and, when the PADDED flag was present, decremented the fragment size before ensuring that the frame contained the mandatory pad length byte. A zero-length padded DATA frame could therefore underflow the unsigned fragment size and read the pad length byte past the end of the frame buffer.<br><br>Affected Scenarios:<br>Apache bRPC servers that accept HTTP/2 traffic are affected when a remote client can send crafted HTTP/2 frames to the server. HTTP/2 may be reached through cleartext h2c detection on an HTTP port or through TLS ALPN negotiation.<br><br>How to Fix:<br>(Choose one of the following options)<br>1. Upgrade Apache bRPC to version 1.18.0, which fixes this issue.<br>2. Apply this patch: <a target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/apache/brpc/pull/3325\">https://github.com/apache/brpc/pull/3325</a><br><br>Note:<br>The fix validates that a padded DATA frame has enough payload bytes for the pad length field before decrementing the fragment size or reading the pad length byte. Malformed zero-length padded DATA frames are rejected with HTTP/2 FRAME_SIZE_ERROR."
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}
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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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"url": "https://lists.apache.org/thread/2pf15ojj0vr7rtx95677kgtl1mx3gdgb",
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"tags": [
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"vendor-advisory"
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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": "Textual description of severity",
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"content": {
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"text": "high"
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}
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Nikko Enggaliano Pratama",
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"type": "finder"
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}
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],
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"x_generator": {
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"engine": "Vulnogram 0.2.0"
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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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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.5,
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"attackVector": "NETWORK",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"confidentialityImpact": "NONE"
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}
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},
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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": "2026-10-21T13:07:50.344384Z",
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"id": "CVE-2026-56386",
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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": "2026-10-21T13:07:53.942Z"
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}
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}
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]
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}
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} |