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Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records

CVSS 4.0 6.9 MEDIUMCVSS 3.1 5.3 MEDIUMEUVD CVSS 4.0 6.9 CVSS 4.0 · [email protected] · Secondary 6.9 MEDIUMCVSS 3.1 · [email protected] · Secondary 5.3 MEDIUMCVSS_V4 Publisher rating MODERATEFixed by hickory-resolver 0.26.2KEV status unknown

cve-program · CVE-2026-123585

Published

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses can include CNAME records in the authority or additional sections, or outside the original query name's CNAME chain, causing excess resolver queries and increased query amplification.

Read the publisher's advisory

euvd · EUVD-2026-119344

Published

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses can include CNAME records in the authority or additional sections, or outside the original query name's CNAME chain, causing excess resolver queries and increased query amplification.

Read the publisher's advisory

nvd · CVE-2026-123585

Published

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses can include CNAME records in the authority or additional sections, or outside the original query name's CNAME chain, causing excess resolver queries and increased query amplification.

Read the publisher's advisory

osv · GHSA-6f2x-v7q7-m7m5

Published

When the Hickory DNS resolver follows CNAME records, it sends queries that are not necessary to answer the original recursive query. If there are any CNAME records in the authority section or additional section of the response, queries will be sent for those names. If there are any CNAME records that are not part of a CNAME chain starting from the original recursive query name, queries will be sent for those names. This increases query amplification beyond what is necessary to answer the recursive query.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

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Risk history

Compare earlier KEV listings and daily EPSS scores. Advisory wording and affected versions have a separate history.

When does an EPSS score appear as a change?

A prediction change is reported when EPSS rises from below 10% to 10% or higher. Other daily score changes remain in this history.

Advisory history

10 saved versions

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14 Nov 2026 11:58:37 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

euvd · EUVD-2026-119344 · Published

12 Nov 2026 12:55:43 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

nvd · CVE-2026-123585 · Published

12 Nov 2026 11:56:07 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

euvd · EUVD-2026-119344 · Published

10 Nov 2026 19:21:22 UTC

Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records

cve-program · CVE-2026-123585 · Published

10 Nov 2026 11:25:48 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

euvd · EUVD-2026-119344 · Published

8 Nov 2026 11:07:51 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

euvd · EUVD-2026-119344 · Published

8 Nov 2026 11:07:14 UTC

The hickory-resolver component of Hickory DNS 0.25.0 before 0.26.2 follows irrelevant CNAME records when resolving recursive queries, sending queries that are unnecessary to answer the original request. Attackers controlling DNS responses c…

nvd · CVE-2026-123585 · Published

8 Nov 2026 03:06:35 UTC

Hickory DNS 0.25.0 before 0.26.2 Query Amplification via Irrelevant CNAME Records

cve-program · CVE-2026-123585 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 21:13 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current