CVE catalog
CVE-2026-101338
When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data
- Severity
- High · CVSS 8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.34% · Oct 25, 2026
When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).
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 | nsd | sid | 4.15.4-1 | fixed |
| Debian | nsd | forky | 4.15.4-1 | fixed |
| Debian | nsd | trixie | 4.12.0-1 | vulnerable |
| Debian | nsd | bookworm | 4.6.1-1 | vulnerable |
| Alpine | nsd | 3.24 | 4.14.3-r1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | nsd | source | sid | 4.15.3-1 | not yet assigned | Not reported | [1150930] |
| Debian | nsd | source | forky | 4.15.3-1 | not yet assigned | Not reported | [1150930] |
| Debian | nsd | source | trixie | (unfixed) | not yet assigned | Not reported | [1150930] |
| Debian | nsd | source | bookworm | (unfixed) | not yet assigned | Not reported | [1150930] |
| Alpine | nsd | apk | 3.24 | 4.14.3-r1 | Not reported | ALPINE-CVE-2026-101338 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [nsd]Affected
Details (2)
4.6.1-1· amd64 · bookwormAffected
nvd · nsd · debian · bookworm; nvd · nsd · debian · 12
4.6.1-1· arm64 · bookwormAffected
nvd · nsd · debian · bookworm; nvd · nsd · debian · 12
[Debian 13 (Trixie)]
- [nsd]Affected
Details (2)
4.12.0-1· amd64 · trixieAffected
nvd · nsd · debian · 13
4.12.0-1· arm64 · trixieAffected
nvd · nsd · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-101338]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-101338]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-101338]
- [https://security-tracker.debian.org/tracker/CVE-2026-101338]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101338.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]