DEBIAN-CVE-2026-82720
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-82720
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-82720.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-82720
- Upstream
- Published
- 2026-09-16T09:17:06Z
- Modified
- 2026-09-19T17:00:10Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
NLnet Labs Unbound 1.12.0 up to and including 1.26.0 has a use-after-free vulnerability when compiled for DNS-over-HTTPs support with '--with-libnghttp2'. During failure code paths (i.e., RPZ drop query, jostle due to heavy traffic), a dropped DoH stream brings down the whole DoH session and does not account properly for other DoH streams in the same session. This leads to use-after-free in those code paths. If the prerequisites are satisfied (possible RPZ drop or heavy client traffic), a malicious actor can trigger the vulnerability with a single DoH connection and the appropriate traffic. Impact is limited as the reads are not user controlled and the use-after-free leads to early returns. However, a hardened allocator can catch the use-after-free and controllably terminate the process resulting to denial of service.
- References
Affected packages
Debian:12 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:13 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed1.26.1-0+deb13u1
Debian:14 / unbound
Package
- Name
- unbound
- Purl
- pkg:deb/debian/unbound?arch=source&distro=forky
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed1.26.1-1