7.5

CVE-2026-11605: isc bind 9

CVSS: 7.5v3.1HighUndergoing analysis
AliasesALPINE-CVE-2026-11605RHSA-2026:42853UBUNTU-CVE-2026-11605
Published 22-07-2026Last modified 22-07-2026
Open JSON

Vulnerability summary

CVE-2026-11605 is a high (CVSS 7.5) vulnerability in isc bind 9. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.54%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 4
MGASA-2026-0331OPENSUSE-SU-2026:11375-1OPENSUSE-SU-2026:21489-1SUSE-SU-2026:3426-1USN-8648-1

Timeline

  1. 22-07-2026
    PublishedVulnerability first disclosed.
  2. 22-07-2026
    Last modifiedVulnerability information updated.

Description

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

0.00 pp

From 0.54% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.54%

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

Redhat7 products
  • bind< 0:9.18.50-22.hum1
  • bind-chroot< 0:9.18.50-22.hum1
  • bind-devel< 0:9.18.50-22.hum1
  • bind-dnssec-utils< 0:9.18.50-22.hum1
  • bind-doc< 0:9.18.50-22.hum1
Alpine1 product
  • bind< 9.20.26-r0
Debian1 product
  • bind9< 1:9.18.49-1~deb12u2 | < 1:9.20.26-1~deb13u1 | < 1:9.20.26-1
Isc1 product
  • bind 9≥ 9.20.0, ≤ 9.20.24 | ≥ 9.21.0, ≤ 9.21.23 | ≥ 9.20.9-S1, ≤ 9.20.24-S1
Ubuntu1 product
  • bind9< 1:9.20.24-1ubuntu0.2

5 vendors · 11 products

References

15 links
Show all 15 references