159 lines
6.3 KiB
JSON
159 lines
6.3 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-2026-78227",
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"assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
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"state": "PUBLISHED",
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"assignerShortName": "NLnet Labs",
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"dateReserved": "2026-09-07T14:06:21.963Z",
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"datePublished": "2026-09-16T08:29:52.342Z",
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"dateUpdated": "2026-09-16T15:33:54.267Z"
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},
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"containers": {
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"cna": {
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"title": "Use-after-free in DoQ stream output buffer on reset re-transmission",
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"datePublic": "2026-09-16T00:00:00.000Z",
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"affected": [
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{
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"vendor": "NLnet Labs",
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"product": "Unbound",
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"versions": [
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{
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"version": "1.22.0",
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"status": "affected",
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"lessThan": "1.26.1",
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"versionType": "semver"
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}
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],
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"defaultStatus": "unaffected"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "NLnet Labs Unbound 1.22.0 up to and including 1.26.1, has a use-after-free vulnerability when compiled for DNS-over-QUIC support with '--with-libngtcp2'. Each DoQ stream owns an output buffer that holds the DNS response. ngtcp2's retransmission buffer keeps a shallow pointer into the output buffer for as long as a STREAM frame may be resent. On a client RESET_STREAM, the output buffer is freed but ngtcp2 still holds the matching retransmission entries. The next PTO timeout makes ngtcp2 re-encode the STREAM frame and copy from the freed buffer. A malicious actor that can query Unbound over DoQ and that withholds ACKs, sends RESET_STREAM, and waits for PTO, reaches this use-after-free with no privilege. This leads to retransmissions against freed memory and eventually an abnormal server exit under a 20-query spray."
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}
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],
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"metrics": [
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{
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "compiled with DNS-over-QUIC support"
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}
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],
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"cvssV3_1": {
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"version": "3.1",
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"baseScore": 6.5,
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"cweId": "CWE-416",
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"description": "CWE-416: Use After Free",
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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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"solutions": [
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{
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"lang": "en",
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"value": "This issue is fixed starting with version 1.26.1"
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}
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],
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"timeline": [
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{
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"time": "2026-08-11T00:00:00.000Z",
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"lang": "en",
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"value": "Issue reported by Yuqi Qiu"
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},
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{
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"time": "2026-08-13T00:00:00.000Z",
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"lang": "en",
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"value": "NLnet Labs shares patch"
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},
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{
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"time": "2026-08-14T00:00:00.000Z",
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"lang": "en",
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"value": "Yuqi Qiu verifies patch"
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},
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{
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"time": "2026-09-16T00:00:00.000Z",
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"lang": "en",
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"value": "Fixes released with version 1.26.1"
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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": "Yuqi Qiu (Nankai University, AOSP Lab)",
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"type": "finder"
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},
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{
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"lang": "en",
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"value": "Xiang Li (Nankai University, AOSP Lab)",
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"type": "finder"
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}
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],
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"references": [
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{
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"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-78227.txt",
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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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"providerMetadata": {
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"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
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"shortName": "NLnet Labs",
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"dateUpdated": "2026-09-16T08:29:52.342Z"
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},
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"x_generator": {
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"engine": "cvelib 1.8.0"
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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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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-09-16T15:33:40.171223Z",
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"id": "CVE-2026-78227",
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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": "2026-09-16T15:33:54.267Z"
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}
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}
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]
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}
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} |