5.9

CVE-2026-19662: isc bind 9 Use After Free

CVSS: 5.9v3.1MediumAwaiting analysis
AliasesALPINE-CVE-2026-19662UBUNTU-CVE-2026-19662DEBIAN-CVE-2026-19662
Published 16-09-2026Last modified 17-09-2026
Open JSON

Vulnerability summary

CVE-2026-19662 is a medium (CVSS 5.9) Use After Free vulnerability in isc bind 9. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.8% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 8
MGASA-2026-0422OPENSUSE-SU-2026:11916-1OPENSUSE-SU-2026:22049-1RHSA-2026:68279SUSE-SU-2026:24157-1SUSE-SU-2026:4285-1

Timeline

  1. 16-09-2026
    PublishedVulnerability first disclosed.
  2. 17-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

39%

Versus all other CVEs

30-day change

+0.05 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.46%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard7 products
  • bindAll versions (No fix recorded)
  • bind-devAll versions (No fix recorded)
  • bind-dnssec-rootAll versions (No fix recorded)
  • bind-dnssec-toolsAll versions (No fix recorded) | < 9.20.29-r1
  • bind-libsAll versions (No fix recorded)
Wolfi7 products
  • bindAll versions (No fix recorded)
  • bind-devAll versions (No fix recorded)
  • bind-dnssec-rootAll versions (No fix recorded)
  • bind-dnssec-toolsAll versions (No fix recorded) | < 9.20.29-r1
  • bind-libsAll versions (No fix recorded)
Ubuntu3 products
  • bind9All versions (No fix recorded) | < 1:9.18.30-0ubuntu0.20.04.2+esm3 | < 1:9.18.39-0ubuntu0.22.04.7 | < 1:9.18.39-0ubuntu0.24.04.8 | < 1:9.20.24-1ubuntu0.4
  • bind9-libsAll versions (No fix recorded)
  • isc-dhcpAll versions (No fix recorded)
Alpine1 product
  • bind< 9.20.29-r0
Debian1 product
  • bind9All versions (No fix recorded) | < 1:9.20.29-1~deb13u1 | < 1:9.20.29-1
Isc1 product
  • bind 9≥ 9.11.0, ≤ 9.18.50 | ≥ 9.20.0, ≤ 9.20.27 | ≥ 9.11.3-S1, ≤ 9.18.50-S1 | ≥ 9.20.9-S1, ≤ 9.20.27-S1

6 vendors · 20 products

References

7 links