In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems… (CVE-2026-82717)
NLnet Labs Unbound up to and including version 1.26.0 contains a vulnerability that can progressively corrupt heap memory. Under certain systems and compilation options, this memory corruption may lead to remote code execution. The issue arises during CNAME synthesis when enforcing a max TTL value, combined with a compression pointer that invalidates the domain name and causes improper buffer position handling. This leads to a heap buffer overflow and potential crash or remote code execution.
AI Analysis
Technical Summary
CVE-2026-82717 affects NLnet Labs Unbound versions up to and including 1.26.0. The vulnerability is triggered during CNAME synthesis in an upstream DNS response when a max TTL value is rewritten in the packet buffer. A compression pointer referencing the overwritten value invalidates the domain name, causing an error path that fails to properly advance the buffer position. This results in a heap buffer overflow that progressively corrupts heap memory. Depending on system architecture and compilation options, this memory corruption can lead to a crash or remote code execution.
Potential Impact
The vulnerability can cause progressive heap memory corruption, leading to application crashes. On certain systems with specific compilation options, it may allow remote code execution, posing a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor vendor communications for updates. No vendor advisory or patch links are provided in the current data.
In NLnet Labs Unbound up to and including 1.26.0, a vulnerability was found in that can progressively corrupt heap memory and under certain systems… (CVE-2026-82717)
Description
NLnet Labs Unbound up to and including version 1.26.0 contains a vulnerability that can progressively corrupt heap memory. Under certain systems and compilation options, this memory corruption may lead to remote code execution. The issue arises during CNAME synthesis when enforcing a max TTL value, combined with a compression pointer that invalidates the domain name and causes improper buffer position handling. This leads to a heap buffer overflow and potential crash or remote code execution.
CVSS v4.0
Affected software
pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/unbound?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/unbound?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/unbound?arch=source&distro=jammypkg:deb/ubuntu/unbound?arch=source&distro=noblepkg:deb/ubuntu/unbound?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-82717 affects NLnet Labs Unbound versions up to and including 1.26.0. The vulnerability is triggered during CNAME synthesis in an upstream DNS response when a max TTL value is rewritten in the packet buffer. A compression pointer referencing the overwritten value invalidates the domain name, causing an error path that fails to properly advance the buffer position. This results in a heap buffer overflow that progressively corrupts heap memory. Depending on system architecture and compilation options, this memory corruption can lead to a crash or remote code execution.
Potential Impact
The vulnerability can cause progressive heap memory corruption, leading to application crashes. On certain systems with specific compilation options, it may allow remote code execution, posing a significant security risk.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor vendor communications for updates. No vendor advisory or patch links are provided in the current data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-82717
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab4be4af7a7c54106f0480d
Added to database: 09/24/2026, 06:08:10 UTC
Last enriched: 09/24/2026, 06:42:58 UTC
Last updated: 09/25/2026, 03:47:33 UTC
Views: 5
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