CVE catalog
CVE-2026-82717
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 and compilation options could lead to remote code ex
- Severity
- Critical · CVSS 9.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Red - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.78% · Oct 25, 2026
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 and compilation options could lead to remote code execution. The vulnerability starts when CNAME synthesis during an upstream response needs to enforce(rewrite) a max TTL value in the packet buffer. Coupled with a compression pointer that points to the overwritten value and invalidates the domain name, it leads to an error path that does not properly move the buffer position and allows for the heap buffer overflow. Since this is heavily reliant on heap memory layout, results are memory corruption that eventually leads to a crash and under specific systems and compilation options remote code execution.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | unbound | sid | 1.26.2-1 | fixed |
| Debian | unbound | forky | 1.26.2-1 | fixed |
| Debian | unbound | trixie | 1.22.0-2+deb13u3 | vulnerable |
| Debian | unbound | trixie-security | 1.26.2-0+deb13u1 | fixed |
| Debian | unbound | bookworm | 1.17.1-2+deb12u4 | vulnerable |
| Debian | unbound | bookworm-security | 1.17.1-2+deb12u3 | vulnerable |
| Cpe | unbound | Not reported | 1.26.1 | fixed |
| Ubuntu | unbound | noble | 1.19.2-1ubuntu3.10 | fixed |
| Ubuntu | libunbound-dev | noble | 1.19.2-1ubuntu3.10 | fixed |
| Ubuntu | libunbound8 | noble | 1.19.2-1ubuntu3.10 | fixed |
| Ubuntu | python3-unbound | noble | 1.19.2-1ubuntu3.10 | fixed |
| Ubuntu | unbound-anchor | noble | 1.19.2-1ubuntu3.10 | fixed |
| Ubuntu | unbound-host | noble | 1.19.2-1ubuntu3.10 | fixed |
| Suse | unbound | linux enterprise micro 5.5 | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise high performance computing 15 sp4-espos | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise high performance computing 15 sp4-ltss | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise high performance computing 15 sp5-espos | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise high performance computing 15 sp5-ltss | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise server 15 sp4-ltss | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise server 15 sp5-ltss | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise server for sap applications 15 sp4 | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise server for sap applications 15 sp5 | 1.26.1-150100.10.31.1 | fixed |
| Suse | unbound | linux enterprise module for basesystem 15 sp7 | 1.26.1-150600.23.24.1 | fixed |
| Suse | unbound | linux enterprise module for package hub 15 sp7 | 1.26.1-150600.23.24.1 | fixed |
| Suse | unbound | linux enterprise server 15 sp6-ltss | 1.26.1-150600.23.24.1 | fixed |
| Suse | unbound | linux enterprise server for sap applications 15 sp6 | 1.26.1-150600.23.24.1 | fixed |
| Alpine | unbound | 3.22 | 1.25.2-r0 | fixed |
| Alpine | unbound | 3.23 | 1.25.2-r0 | fixed |
| Alpine | unbound | 3.24 | 1.25.2-r2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | unbound | source | sid | 1.26.1-1 | not yet assigned | Not reported | Not reported |
| Debian | unbound | source | forky | 1.26.1-1 | not yet assigned | Not reported | Not reported |
| Debian | unbound | source | trixie | 1.26.1-0+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | unbound | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Cpe | unbound | cpe | Not reported | 1.26.1 | Not reported | NVD-CVE-2026-82717 | Not reported |
| Ubuntu | unbound | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Ubuntu | libunbound-dev | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Ubuntu | libunbound8 | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Ubuntu | python3-unbound | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Ubuntu | unbound-anchor | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Ubuntu | unbound-host | deb | noble | 1.19.2-1ubuntu3.10 | Not reported | Not reported | Not reported |
| Suse | unbound | rpm | linux enterprise micro 5.5 | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise high performance computing 15 sp4-espos | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise high performance computing 15 sp4-ltss | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise high performance computing 15 sp5-espos | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise high performance computing 15 sp5-ltss | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server 15 sp4-ltss | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server 15 sp5-ltss | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server for sap applications 15 sp4 | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server for sap applications 15 sp5 | 1.26.1-150100.10.31.1 | Not reported | SUSE-SU-2026:4624-1 | Not reported |
| Suse | unbound | rpm | linux enterprise module for basesystem 15 sp7 | 1.26.1-150600.23.24.1 | Not reported | SUSE-SU-2026:4620-1 | Not reported |
| Suse | unbound | rpm | linux enterprise module for package hub 15 sp7 | 1.26.1-150600.23.24.1 | Not reported | SUSE-SU-2026:4620-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server 15 sp6-ltss | 1.26.1-150600.23.24.1 | Not reported | SUSE-SU-2026:4620-1 | Not reported |
| Suse | unbound | rpm | linux enterprise server for sap applications 15 sp6 | 1.26.1-150600.23.24.1 | Not reported | SUSE-SU-2026:4620-1 | Not reported |
| Alpine | unbound | apk | 3.22 | 1.25.2-r0 | Not reported | ALPINE-CVE-2026-82717 | Not reported |
| Alpine | unbound | apk | 3.23 | 1.25.2-r0 | Not reported | ALPINE-CVE-2026-82717 | Not reported |
| Alpine | unbound | apk | 3.24 | 1.25.2-r2 | Not reported | ALPINE-CVE-2026-82717 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libunbound8]Affected
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [libunbound-dev]Affected
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [python3-unbound]Affected
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound]Affected
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound-anchor]Affected
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
- [unbound-host]Affected
Source package: [unbound]
Details (4)
1.17.1-2+deb12u4· amd64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u4· arm64 · bookwormAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· amd64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
1.17.1-2+deb12u3· arm64 · bookworm-securityAffected
nvd · unbound · debian · bookworm; nvd · unbound · debian · 12
[Debian 13 (Trixie)]
- [libunbound8]Affected
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
- [libunbound-dev]Affected
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
- [python3-unbound]Affected
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
- [unbound]Affected
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
- [unbound-anchor]Affected
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
- [unbound-host]Affected
Source package: [unbound]
Details (6)
1.22.0-2+deb13u3· amd64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixieAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· amd64 · trixie-security · Historical versionAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.22.0-2+deb13u3· arm64 · trixie-securityAffected · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.1-0+deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
1.26.2-0+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.26.1-0+deb13u1nvd · unbound · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_70754.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-82717]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-82717]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-82717]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4620-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4624-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-82717]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-82717.json]
- [https://ubuntu.com/security/notices/USN-8873-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-3392.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]