234 lines
9.2 KiB
JSON
234 lines
9.2 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-2026-32665",
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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": "2026-05-07T10:07:51.860Z",
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"datePublished": "2026-07-22T13:04:18.594Z",
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"dateUpdated": "2026-09-16T14:24:37.708Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"defaultStatus": "unaffected",
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"product": "Unbound",
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"vendor": "NLnet Labs",
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"versions": [
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{
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"lessThan": "1.25.2",
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"status": "affected",
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"version": "1.22.0",
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"versionType": "semver"
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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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"type": "finder",
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"value": "N0zoM1z0 (GitHub user)"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "Kunta Chu (Tsinghua University)"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "Kaihua Wang (Tsinghua University)"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "Jianjun Chen (Tsinghua University)"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "Qifan Zhang (Palo Alto Networks)"
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},
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{
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"lang": "en",
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"value": "Xuanchao Xie (University of Science and Technology of China)",
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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": "Lutong Chen (University of Science and Technology of China)",
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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": "Kaiping Xue (University of Science and Technology of China)",
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"type": "finder"
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}
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],
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"datePublic": "2026-07-22T00:00:00.000Z",
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"descriptions": [
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{
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"lang": "en",
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"value": "In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, when downstream DNS-over-QUIC (DoQ) is enabled, the first two bidirectional streams on a new QUIC connection (stream_id 0 and 4) bypass the per-stream 'quic-size' gate entirely, and large input buffers are allocated later, after only the 2-byte length prefix has been received from the initial streams. As a result, a remote client can make Unbound exceed the configured 'quic-size' limit with low-cost input. Using only one connection and two streams, each sending a declared 65535-byte length prefix and then holding the streams open, a client can already trivially make Unbound roughly allocate double that amount. This is a remote availability issue / memory-accounting bypass in the downstream DoQ implementation that leads to denial of service for new DoQ clients. This vulnerability needs Unbound to be compiled with DoQ support ('--with-libngtcp2') and the 'quic-port' to be configured for the listening interfaces."
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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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"baseScore": 7.5,
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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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"version": "3.1"
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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": "Unbound compiled with DoQ support ('--with-libngtcp2')"
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}
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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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"cweId": "CWE-1284",
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"description": "CWE-1284: Improper Validation of Specified Quantity in Input",
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"lang": "en",
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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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"providerMetadata": {
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"orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6",
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"shortName": "NLnet Labs",
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"dateUpdated": "2026-09-16T14:24:37.708Z"
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},
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"references": [
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{
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"tags": [
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"vendor-advisory"
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],
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"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-32665.txt"
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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 1.25.2"
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}
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],
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"timeline": [
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{
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"lang": "en",
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"time": "2026-04-01T00:00:00.000Z",
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"value": "Issue reported by N0zoM1z0"
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},
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{
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"lang": "en",
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"time": "2026-04-03T00:00:00.000Z",
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"value": "NLnet Labs shares patch with N0zoM1z0"
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},
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{
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"lang": "en",
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"time": "2026-04-03T00:00:00.000Z",
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"value": "N0zoM1z0 verifies patch"
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},
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{
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"lang": "en",
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"time": "2026-04-03T00:00:00.000Z",
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"value": "Issue reported by Kunta Chu"
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},
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{
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"lang": "en",
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"time": "2026-04-09T00:00:00.000Z",
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"value": "NLnet Labs shares patch with Kunta Chu"
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},
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{
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"lang": "en",
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"time": "2026-04-03T00:00:00.000Z",
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"value": "Kunta Chu verifies patch"
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},
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{
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"lang": "en",
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"time": "2026-05-30T00:00:00.000Z",
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"value": "Issue reported by Qifan Zhang"
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},
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{
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"lang": "en",
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"time": "2026-06-15T00:00:00.000Z",
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"value": "NLnet Labs shares patch with Qifan Zhang"
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},
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{
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"lang": "en",
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"time": "2026-06-17T00:00:00.000Z",
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"value": "Qifan Zhang verifies patch"
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},
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{
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"lang": "en",
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"time": "2026-07-10T00:00:00.000Z",
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"value": "Issue reported by Xuanchao Xie"
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},
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{
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"lang": "en",
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"time": "2026-07-10T00:00:00.000Z",
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"value": "NLnet Labs shares patch with Xuanchao Xie"
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},
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{
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"lang": "en",
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"time": "2026-07-11T00:00:00.000Z",
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"value": "Xuanchao Xie verifies patch"
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},
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{
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"lang": "en",
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"time": "2026-07-22T00:00:00.000Z",
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"value": "Fixes released with version 1.25.2"
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}
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],
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"title": "Remote DNS-over-QUIC denial of service due to `quic-size` budget bypass",
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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": "2026-07-22T14:31:54.691586Z",
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"id": "CVE-2026-32665",
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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": "yes"
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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": "2026-07-22T14:32:02.752Z"
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}
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}
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]
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}
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} |