ubuntu-cve-2026-5950
Vulnerability from osv_ubuntu
Published
2026-05-20 00:00
Modified
2026-05-27 19:09
Summary
Details
An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.
Severity
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
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"binary_version": "1:9.9.5.dfsg-3ubuntu0.19+esm13"
},
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},
{
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},
{
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{
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},
{
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},
{
"binary_name": "libdns100",
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},
{
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},
{
"binary_name": "libisccc90",
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},
{
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},
{
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},
{
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}
]
},
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},
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"1:9.9.5.dfsg-3ubuntu0.2",
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"1:9.9.5.dfsg-3ubuntu0.8",
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"1:9.9.5.dfsg-3ubuntu0.10",
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"1:9.9.5.dfsg-3ubuntu0.16",
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"1:9.9.5.dfsg-3ubuntu0.19",
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"1:9.9.5.dfsg-3ubuntu0.19+esm2",
"1:9.9.5.dfsg-3ubuntu0.19+esm3",
"1:9.9.5.dfsg-3ubuntu0.19+esm4",
"1:9.9.5.dfsg-3ubuntu0.19+esm5",
"1:9.9.5.dfsg-3ubuntu0.19+esm6",
"1:9.9.5.dfsg-3ubuntu0.19+esm7",
"1:9.9.5.dfsg-3ubuntu0.19+esm9",
"1:9.9.5.dfsg-3ubuntu0.19+esm10",
"1:9.9.5.dfsg-3ubuntu0.19+esm11",
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"1:9.9.5.dfsg-3ubuntu0.19+esm13"
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},
{
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{
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{
"binary_name": "bind9utils",
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{
"binary_name": "dnsutils",
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},
{
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},
{
"binary_name": "libbind9-140",
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},
{
"binary_name": "libdns-export162",
"binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm9"
},
{
"binary_name": "libdns162",
"binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm9"
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{
"binary_name": "libirs-export141",
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{
"binary_name": "libirs141",
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},
{
"binary_name": "libisc-export160",
"binary_version": "1:9.10.3.dfsg.P4-8ubuntu1.19+esm9"
},
{
"binary_name": "libisc160",
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{
"binary_name": "libisccc-export140",
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},
{
"binary_name": "libisccc140",
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},
{
"binary_name": "libisccfg-export140",
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},
{
"binary_name": "libisccfg140",
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},
{
"binary_name": "liblwres141",
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},
{
"binary_name": "lwresd",
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}
]
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{
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{
"binary_name": "libbind9-160",
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},
{
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{
"binary_name": "libisc-export169",
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{
"binary_name": "libisc169",
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{
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{
"binary_name": "libisccfg160",
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{
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{
"ecosystem_specific": {
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{
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{
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},
{
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{
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},
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"4.3.5-3ubuntu7.1",
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},
{
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{
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{
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{
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},
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},
{
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},
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},
{
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{
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{
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{
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{
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{
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{
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},
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},
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"package": {
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"versions": [
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],
"aliases": [],
"details": "An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue affects BIND 9 versions 9.18.36 through 9.18.48, 9.20.8 through 9.20.22, 9.21.7 through 9.21.21, 9.18.36-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.",
"id": "UBUNTU-CVE-2026-5950",
"modified": "2026-05-27T19:09:37Z",
"published": "2026-05-20T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-5950"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5950"
},
{
"type": "REPORT",
"url": "https://kb.isc.org/docs/cve-2026-5950"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8293-1"
}
],
"related": [
"USN-8293-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-5950"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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