Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-81642: In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA can overflow the digest buffer. Remote code execution is possible through attacker controlled data. An adversary can exploit the vulnerability by controlling a malicious zone and querying a vulnerable Unbound.
Fixed packages 12
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | python3-unbound | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | python3-unbound-debuginfo | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-anchor | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-anchor-debuginfo | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-debuginfo | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-debugsource | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-devel | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-libs | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-libs-debuginfo | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-utils | 0:1.17.1-1.amzn2023.0.14 |
| Amazon Linux · 2023 | unbound-utils-debuginfo | 0:1.17.1-1.amzn2023.0.14 |
Vulnerabilities 1
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Critical 9.1CVE-2026-81642 Public exploit
Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in the DNSSEC validator that enables denial of service and possible remote code execution as a result of digesting DNSKEYs. A DNSKEY with an owner compression pointer to its own RDATA…
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-81642.html