CVE-2026-27854

An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27854.json",
    "cna_assigner": "OX"
}

References

Affected packages

Git / github.com/powerdns/pdns

Affected ranges

Type

GIT

Repo

https://github.com/powerdns/pdns

Events

Introduced

298a9d67fb760a12eabe89164f92fb814572aea8

Fixed

0189ba2d45e4089e96ac7cf20107b53c3d950c18

Introduced

89747e81bc60d7950276d5fda3ca669fa81b7cf9

Fixed

4108ae9f5f169166dba3e7f386be570304dfa224

Database specific

{
    "cpe": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.9.0"
        },
        {
            "fixed": "1.9.12"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.0.3"
        }
    ],
    "source": "CPE_RANGE"
}

Affected versions

dnsdist-1.*

dnsdist-1.9.0

dnsdist-1.9.1

dnsdist-1.9.10

dnsdist-1.9.11

dnsdist-1.9.2

dnsdist-1.9.3

dnsdist-1.9.4

dnsdist-1.9.5

dnsdist-1.9.6

dnsdist-1.9.7

dnsdist-1.9.8

dnsdist-1.9.9

dnsdist-2.*

dnsdist-2.0.0

dnsdist-2.0.1

dnsdist-2.0.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27854.json"