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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.3
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS probability
- 0.66%
- CWE
- CWE-606
- Published
- 2026-05-20
- Last modified
- 2026-05-20
Affected products
- ISC BIND 9
- ISC BIND 9
- ISC BIND 9
- ISC BIND 9
- ISC BIND 9
Weakness type
Related vulnerabilities
- CVE-2026-85730 — smol-toml: Denial of Service via malformed TOML documents
- CVE-2026-13761 — Pega Platform versions 7.1.0 through 25.1.2 are affected by an improper validation of inputs that are used for loop conditions, potentially leading to a denial of service or other consequences because of excessive looping.
- CVE-2026-16599 — Denial of Service in GNU wget
- CVE-2026-62901 — .NET Denial of Service Vulnerability
- CVE-2026-71439 — Mermaid radar diagrams are vulnerable to DoS
- CVE-2026-20301 — Cisco IOS Software and IOS XE Software Extensible Messaging Client Protocol Denial of Service Vulnerability
- CVE-2026-67554 — Apache Qpid Proton Dotnet: Unbounded disposition range handling can lead to denial of service
- CVE-2026-68077 — Apache Qpid Broker-J: Unbounded disposition range handling can lead to denial of service