CVE-2026-19662

qpcache NOQNAME proof use-after-free crashes recursive resolver

MEDIUM 5.9

At a glance

Source: NVD
EPSS: EPSS 0.46 % · percentile 40 (2026-10-28)
State: PUBLISHED
Published: 2026-09-16 13:50 UTC
Updated: 2026-09-17 18:45 UTC
Assigner: isc
NVD status: Awaiting Analysis

Description

An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Weaknesses (CWE)

CWE-416 — Use After Free

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	isc
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · security-officer@isc.org (Secondary)

European references

ENISA EUVD · EUVD-2026-80743
GCVE · GCVE-0-2026-19662

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-1376 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr

Affected products

Product	Versions
ISC · BIND 9	affected 9.11.0 ≤ 9.18.50 ; affected 9.20.0 ≤ 9.20.27 ; affected 9.11.3-S1 ≤ 9.18.50-S1 ; affected 9.20.9-S1 ≤ 9.20.27-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