184 lines
7.3 KiB
JSON
184 lines
7.3 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-2026-55717",
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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": "2026-06-22T12:27:22.813Z",
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"datePublished": "2026-07-22T13:09:40.927Z",
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"dateUpdated": "2026-07-22T14:07:31.075Z"
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},
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"containers": {
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"cna": {
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"title": "'serve-expired-client-timeout' and 'response-ip' CNAME redirect could lead to a crash",
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"datePublic": "2026-07-22T00:00:00.000Z",
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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": "1.10.0",
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"status": "affected",
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"lessThan": "1.25.2",
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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": "In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when 'serve-expired: yes' is set together with a 'response-ip: <net> redirect' /'response-ip-data: <net> CNAME <target>' rule (or the RPZ 'rpz-cname-override' equivalent), a remote client who controls any delegated domain can crash the daemon. The serve-expired-client-timeout callback runs a two-pass loop to chase the respip-generated CNAME alias; on the second pass it resets 'alias_rrset' but not 'partial_rep'. Later, this inconsistency leads to a NULL pointer dereference and an eventual crash. A malicious actor can exploit the vulnerability by controlling any zone that replies with an A/AAAA record that falls inside the configured response-ip/rpz subnet. By delaying the answer when the previous record has expired, the vulnerable path of 'serve-expired-client-timeout' is taken leading to denial of service via the server crash."
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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": "GENERAL"
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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": 5.9,
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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:N/I:N/A:H"
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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-476",
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"description": "CWE-476: NULL Pointer Dereference",
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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 1.25.2"
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}
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],
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"timeline": [
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{
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"time": "2026-05-05T00:00:00.000Z",
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"lang": "en",
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"value": "Issue reported by Qifan Zhang"
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},
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{
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"time": "2026-05-27T00:00:00.000Z",
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"lang": "en",
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"value": "Issue reported by Xin Wang"
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},
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{
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"time": "2026-05-27T00:00:00.000Z",
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"lang": "en",
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"value": "NLnet Labs shares patch with Xin Wang"
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},
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{
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"time": "2026-05-27T00:00:00.000Z",
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"lang": "en",
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"value": "Xin Wang verifies patch"
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},
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{
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"time": "2026-05-29T00:00:00.000Z",
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"lang": "en",
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"value": "NLnet Labs shares patch with Qifan Zhang"
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},
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{
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"time": "2026-06-03T00:00:00.000Z",
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"lang": "en",
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"value": "Qifan Zhang verifies patch"
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},
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{
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"time": "2026-07-22T00:00:00.000Z",
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"lang": "en",
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"value": "Fixes released with version 1.25.2"
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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": "Qifan Zhang (Palo Alto Networks)",
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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": "Xin Wang (Northwestern Polytechnical University)",
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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": "Jiapeng Li (Northwestern Polytechnical University)",
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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": "Jiajia Liu (Northwestern Polytechnical University)",
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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-2026-55717.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": "2026-07-22T13:09:40.927Z"
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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": "2026-07-22T14:07:12.831423Z",
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"id": "CVE-2026-55717",
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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": "2026-07-22T14:07:31.075Z"
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}
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}
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]
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}
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} |