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CVE-2026-19941

checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof

Medium5.9EPSS 0.23%
Published
Updated
Reserved
Assigned by
isc

Description

An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. 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.

Scores

CVSS scores of CVE-2026-19941, by who scored it
Scored byCVSSScoreVector
iscCNA (assigner)3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
NVDNVD · Awaiting Analysis3.1Medium5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.23% · top 87% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

Affected products

  • ISC · BIND 9

    • affected 9.11.0 – ≤ 9.18.50
    • affected 9.20.0 – ≤ 9.20.27
    • affected 9.21.0 – ≤ 9.21.25
    • affected 9.11.3-S1 – ≤ 9.18.50-S1
    • affected 9.20.9-S1 – ≤ 9.20.27-S1

What to do

Solution: Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29, 9.21.26, or 9.20.29-S1.

Workaround: No workarounds known.

Exploitation: This flaw was discovered in internal testing. We are not aware of any active exploits.

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .