154 lines
6.2 KiB
JSON
154 lines
6.2 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-2026-42955",
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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": "2026-06-22T10:11:10.510Z",
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"datePublished": "2026-07-22T13:05:53.695Z",
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"dateUpdated": "2026-07-22T14:26:48.806Z"
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},
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"containers": {
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"cna": {
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"title": "Extra fix for CVE-2026-40622 to also clamp the TTL of A/AAAA records disallowing a one-time 'ghost domain' delegation renewal via glue records",
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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": "1.16.2",
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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 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client A/AAAA query can cause Unbound to overwrite the cached expired parent-side glue rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client query is required since Unbound implicitly performs that query. This is a variant of CVE-2026-40622 which only addressed the NS query."
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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": 3.7,
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"baseSeverity": "LOW",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"
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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-672",
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"description": "CWE-672: Operation on a Resource after Expiration or Release",
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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": "2026-05-22T00:00:00.000Z",
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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": "2026-06-10T00:00:00.000Z",
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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": "2026-06-13T00:00:00.000Z",
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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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"references": [
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{
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"url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42955.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": "2026-07-22T13:05:53.695Z"
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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": "2026-07-22T14:26:22.407643Z",
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"id": "CVE-2026-42955",
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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": "2026-07-22T14:26:48.806Z"
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}
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}
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]
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}
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} |