Home→Vulnerabilities→CVE-2026-5950
Disclosed

CVE-2026-5950

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.

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Exploitation Probability (EPSS)

Low Priority
0.07%

The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.

0% (Theoretical)100% (Certainty)

7-Day Exploitation Trend

Vulnerability Timeline

2 events
May 20, 2026
Vulnerability Disclosed
Published to component-level vulnerability database.
May 21, 2026
Last Updated
Record updated with new analysis or tags.

Threat Actor Attribution

PREMIUM INTEL
Associated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes

Remediation & Mitigation

SOLUTION

Official patches and mitigation steps are available for this vulnerability.

# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name

Affected Products

1 Total
isc/bindAll Versions

References

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

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Check your domain or package.json for CVE-2026-5950 exposure.

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Vulnerability Details

CVSS Base Score
5.3/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published Date
May 20, 2026
Last Modified
May 21, 2026
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