CVE-2026-1519

⚠️ high

Summary

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3

Description

If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries).
This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.

CVSS Score

7.5

High

EPSS Score

0.1

Exploit Probability

Published Date

2026-03-25

First Seen: 2026-03-26

📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 68.9% of all 329,778 vulnerabilities in our database.

#102,523

Above average severity

Severity Percentile

🎯 CISA SSVC Assessment Updated: Mar 25, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Partial

Limited system impact

🏆 Discovered By

ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention.

SSVC data provided by CISA

Last Modified 2026-05-21

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE IDs (Weakness Types)

CWE-606

Vendor	Product	Status	Affected Versions
isc	bind	Affected	> 9.11.0 < 9.16.50
isc	bind	Affected	> 9.18.0 < 9.18.47
isc	bind	Affected	> 9.20.0 < 9.20.21
isc	bind	Affected	> 9.21.0 < 9.21.20

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-3039	⚠️ high	7.5	0.1	BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory ...	2026-05-20
CVE-2026-3592	🔶 medium	5.3	0.0	BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a quer...	2026-05-20
CVE-2026-3593	⚠️ high	7.4	0.0	A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20....	2026-05-20
CVE-2026-5946	⚠️ high	7.5	0.1	Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`...	2026-05-20
CVE-2026-5947	⚠️ high	7.5	0.0	Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incomi...	2026-05-20
CVE-2026-5950	🔶 medium	5.3	0.1	An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling ...	2026-05-20

CVE-2026-1519

Summary

Description

📊 Relative Risk Intelligence

🎯 CISA SSVC Assessment Updated: Mar 25, 2026

📦 Affected Products 4

🔗 References 5

🔗 Related CVEs 6