CVE-2026-5950
Unbounded resend loop in BIND 9 resolver
MEDIUM 5.3
En bref
- Source
- NVD
- EPSS
- EPSS 0.66 % · centile 51 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- isc
- Statut NVD
- Analyzed
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.
Faiblesses (CWE)
- CWE-606 — Unchecked Input for Loop Condition
Références
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | isc |
| CVSS 3.1 | MEDIUM 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | NVD · security-officer@isc.org (Secondary) |
Références européennes
- ENISA EUVD · EUVD-2026-31109
- GCVE · GCVE-0-2026-5950
Avis du CERT-FR
- CERTFR-2026-AVI-0626 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*≥ 9.18.36 < 9.18.49cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*≥ 9.20.8 < 9.20.23cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*≥ 9.21.7 < 9.21.21
Produits affectés
| Produit | Versions |
|---|---|
| ISC · BIND 9 | affected 9.18.36 ≤ 9.18.48 ; affected 9.20.8 ≤ 9.20.22 ; affected 9.21.7 ≤ 9.21.21 ; affected 9.18.36-S1 ≤ 9.18.48-S1 ; affected 9.20.9-S1 ≤ 9.20.22-S1 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |