5.8

CVE-2026-78301: isc bind 9

CVSS: 5.8v3.1MediumAwaiting analysis
AliasesALPINE-CVE-2026-78301UBUNTU-CVE-2026-78301DEBIAN-CVE-2026-78301
Published 16-09-2026Last modified 17-09-2026
Open JSON

Vulnerability summary

CVE-2026-78301 is a medium (CVSS 5.8) vulnerability in isc bind 9. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Overall risk
23/100
0100
Low · default modelHow is this calculated?
CVSS score
5.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · +0.03 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

A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 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

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.03 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.21%

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)
  • bind-libs< 9.20.29-r1
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)
  • bind-libs< 9.20.29-r1
Ubuntu3 products
  • bind9All versions (No fix recorded) | < 1:9.9.5.dfsg-3ubuntu0.19+esm15 | < 1:9.10.3.dfsg.P4-8ubuntu1.19+esm11 | < 1:9.11.3+dfsg-1ubuntu1.19+esm6 | < 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 | ≥ 9.21.0, ≤ 9.21.25 | ≥ 9.11.3-S1, ≤ 9.18.50-S1 | ≥ 9.20.9-S1, ≤ 9.20.27-S1

6 vendors · 20 products

References

8 links