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OpenAdvisories
High ALAS2023-2026-1755 4 CVEs

Important: bind security update (Amazon Linux 2023)

Published May 25, 2026 · Updated May 26, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-5950: Avoid unbounded recursion loop CVE-2026-5946: An unauthenticated remote attacker can crash any affected named instance with a single crafted DNS message, causing denial of service. Both authoritative servers and resolvers are affected. CVE-2026-3592: Limit resolver server list size CVE-2026-3039: Fix GSS-API resource leak

Fixed packages 13

ReleasePackageFixed in
Amazon Linux · 2023 bind 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-chroot 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-debuginfo 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-debugsource 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-devel 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-dnssec-utils 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-dnssec-utils-debuginfo 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-doc 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-libs 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-libs-debuginfo 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-license 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-utils 32:9.18.49-1.amzn2023.0.1
Amazon Linux · 2023 bind-utils-debuginfo 32:9.18.49-1.amzn2023.0.1

Vulnerabilities 4

  • High 7.5
    CVE-2026-3039

    BIND 9 server memory exhaustion during GSS-API TKEY negotiation

    BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integr…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine
  • High 7.5
    CVE-2026-5946

    Invalid handling of CLASS != IN

    Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafte…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine
  • Medium 5.3
    CVE-2026-3592

    Amplification vulnerabilities via self-pointed glue records

    BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 through 9.16.…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine
  • Medium 5.3
    CVE-2026-5950 Public exploit

    Unbounded resend loop in BIND 9 resolver

    An unbounded resend loop vulnerability exists in the BIND 9 resolver state machine during bad-server handling, enabling a remote unauthenticated attacker to cause severe resource exhaustion by sending queries that trigger specific retry conditions. This issue…

    ISC BIND 9 bind9 bind9 Debian Ubuntu Azure Linux Alpine

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-3039.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-3592.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-5946.html
  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-5950.html