CVE-2026-123587

Hickory-DNS 0.26.0 before 0.26.2 DNSSEC Nonexistence Forgery via Wraparound NSEC

CVSS 4.0 8.9 HIGHCVSS 3.1 6.8 MEDIUMEUVD CVSS 4.0 8.9 CVSS 4.0 · [email protected] · Secondary 8.9 HIGHCVSS 3.1 · [email protected] · Primary 6.8 MEDIUMosv · severity unknownFixed by hickory-net 0.26.2KEV status unknown

Original advisory

cve-program · CVE-2026-123587

Published

The DNSSEC validation in the Hickory DNS hickory-net crate 0.26.0 before 0.26.2 identifies wraparound NSEC records by comparing the next domain name to an SOA record in the response, accepting that SOA even if it fails validation. Attackers who can supply DNS responses can combine a genuine NSEC record and its RRSIG with a crafted SOA record to forge nonexistence of any RRset.

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euvd · EUVD-2026-119346

Published

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nvd · CVE-2026-123587

Published

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osv · RUSTSEC-2026-0508

Published

The last NSEC record in a zone points back to the zone apex. To recognise it, DNSSEC validation treated an NSEC record as covering every name after its owner when its next domain name equalled the owner name of an SOA record in the response. That SOA record did not have to pass validation. An attacker who can answer or modify DNS responses can replay a genuine NSEC record and its RRSIG, add a forged SOA record whose name equals that NSEC record's next domain name, and so make the validator accept that any name sorting after the NSEC owner does not exist. This affects DNSSEC validation through `DnssecDnsHandle` when built with `dnssec-ring` or `dnssec-aws-lc-rs`. The fix recognises a wraparound NSEC record from the chain itself (its next domain name sorts at or before its owner and is the zone of the queried name) and only uses validated SOA records. It is in 0.26.2.

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Affected versions, risk and source history

cve-program · CVE-2026-123587

Published

hickory-dns

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "hickory-dns",
                    "product": "hickory-dns",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:cargo/hickory-net",
                    "versions": [
                        {
                            "version": "0.26.0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.26.2"
                        },
                        {
                            "version": "0.26.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-119346

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Nov 8, 2026, 1:38:19 AM

dateUpdated: Nov 8, 2026, 1:38:19 AM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

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nvd · CVE-2026-123587

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-290

Original publisher date fields

published: 2026-11-08T02:16:52.637

lastModified: 2026-11-10T22:15:59.797

Original source record · Cite this exact observation · Complete original publisher JSON

osv · RUSTSEC-2026-0508

Published

hickory-net

crates.io

SEMVER · introduced 0.26.0 → fixed 0.26.2

Original source record · Cite this exact observation · Complete original publisher JSON