HOMEVULNERABILITIESCVE-2026-5950
MEDIUM

CVE-2026-5950

CWE-606Published: May 20, 2026· Updated: May 21, 2026

5.3
CVSS v3.1
EPSS:0.11%probability of exploitation in 30 daysPercentile:28.9th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-5950 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Vendors & Products

isc1 product
bind
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://downloads.isc.org/isc/bind9/9.18.49
PATCHhttps://downloads.isc.org/isc/bind9/9.20.23
PATCHhttps://downloads.isc.org/isc/bind9/9.21.22
ADVISORYhttps://kb.isc.org/docs/cve-2026-5950

All References (4)

→
https://downloads.isc.org/isc/bind9/9.18.49Patch
→
https://downloads.isc.org/isc/bind9/9.20.23Patch
→
https://downloads.isc.org/isc/bind9/9.21.22Patch
→
https://kb.isc.org/docs/cve-2026-5950Vendor Advisory

Quick Facts

CVE IDCVE-2026-5950
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-606
CISA KEVNo
EPSS (30d)0.11%
Affected1 vendor
PublishedMay 20, 2026

Related CVEs (CWE-606)

CVE-2026-27689
7.7
CVE-2026-1519
7.5
CVE-2019-25624
5.5
CVE-2026-0243
4.9
CVE-2026-41986
2.4

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5950 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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