How severe is CVE-2026-11331?

CVE-2026-11331 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-11331 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-11331?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-11331 published?

CVE-2026-11331 was published on 2026-07-22.

CVE-2026-11331

CVE-2026-11331 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-790.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-790
Published: 2026-07-22
Last modified: 2026-07-22

Description

An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

Frequently asked questions

What is CVE-2026-11331?: An attacker who knows (or guesses) that a resolver uses RPZ with wildcard CNAME policies can craft query names long enough to trigger a NAMETOOLONG error condition during RPZ processing. This is not handled correctly and may lead to defeating the RPZ rule. It also may lead to an unexpected exit of the BIND 9 software. This issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.16.8-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
How severe is CVE-2026-11331?: CVE-2026-11331 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-11331 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-11331?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-11331 published?: CVE-2026-11331 was published on 2026-07-22.

References

Other CWE-790 vulnerabilities

CVE-2023-22578 — Critical (CVSS 10.0): Due to improper artibute filtering in the sequalize js library, can a attacker peform SQL injections.
CVE-2023-45239 — Critical (CVSS 9.8): A lack of input validation exists in tac_plus prior to commit 4fdf178 which, when pre or post auth commands are…
CVE-2024-31616 — High (CVSS 8.8): An issue discovered in RG-RSR10-01G-T(W)-S and RG-RSR10-01G-T(WA)-S routers with firmware version…
CVE-2026-2328 — High (CVSS 7.5): An unauthenticated remote attacker can exploit insufficient input validation to access backend components beyond their…
CVE-2025-27260 — High (CVSS 7.5): Ericsson Indoor Connect 8855 versions prior to 2025.Q3 contains an Improper Filtering of…
CVE-2025-0431 — Medium (CVSS 5.8): Enterprise Protection contains a vulnerability in URL rewriting that allows an unauthenticated remote attacker to send…

Browse all CWE-790 vulnerabilities →