CVE-2026-45673

ADVISORY - github

Summary

Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack).

Details

Two factors contribute to this vulnerability in io.netty.resolver.dns:

Predictable Query IDs: DnsQueryIdSpace manages 16-bit transaction IDs in buckets of 16,384 IDs. It initializes only the first bucket. When an ID is returned, it is pushed back into the bucket at a random index generated by java.util.concurrent.ThreadLocalRandom:

Random random = ThreadLocalRandom.current();
int insertionPosition = random.nextInt(count + 1);

Because ThreadLocalRandom is a predictable LCG and the resolver operates within a single bucket, the sequence of IDs is predictable once the PRNG state is mathematically recovered.

Default Static Source Port: DnsNameResolverBuilder defaults to a channelStrategy of ChannelPerResolver. This binds the DatagramChannel once, resulting in a static source port for all subsequent queries.

Combined, a static source port and predictable transaction IDs reduces the entropy required to secure DNS resolution against spoofing.

Impact

DNS Cache Poisoning. Downstream applications using the default Netty DNS resolver may connect to malicious IPs, leading to traffic interception or MitM attacks.

EPSS Score⁠: 0.00403 (0.327)

Common Weakness Enumeration (CWE)

ADVISORY - nist

NIST

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY IDCVE-2026-45673⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-330⁠CWE-340⁠

CVSS SCORE

6.8medium

GitHub

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY IDGHSA-xmv7-r254-6q78⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-330⁠CWE-340⁠

CVSS SCORE

6.8medium

Debian

CREATED

4 months ago

UPDATED

24 days ago

ADVISORY IDCVE-2026-45673⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Ubuntu

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY IDCVE-2026-45673⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

CVSS SCORE

N/Amedium

Red Hat

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY IDCVE-2026-45673⁠

EXPLOITABILITY SCORE

2.2

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-1241⁠

CVSS SCORE

6.8medium

Chainguard

CREATED

22 days ago

UPDATED

22 days ago

ADVISORY ID

CGA-6hjh-xg8v-9qf5

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-2pm2-mrc5-qcr5

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-2rc2-vpcx-qc24

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-3cjc-42cc-34wh

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-3prg-w6wr-3h4f

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

15 days ago

UPDATED

15 days ago

ADVISORY ID

MINI-47m2-xv6r-7c3q

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-49cq-vfrr-m3rr

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-4wx5-vfh2-87wg

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-56cg-3p47-3x7q

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-5xv6-x9qr-5r4v

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-65cp-993p-hj38

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-6cv6-5wcw-3mgw

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-6w6r-qg29-jh5w

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-6x5r-xcfg-7w4x

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-6x66-m7c7-w784

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-7hh5-9vhm-3q9m

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

15 days ago

UPDATED

15 days ago

ADVISORY ID

MINI-7r8g-5j5h-6m6x

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-82p8-c54r-gvqv

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-8463-j95g-cgg2

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-8484-m2gq-pv9m

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-87m3-m693-mx89

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-8843-4jhm-c523

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-8h2w-868j-4976

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-8vfx-5rw6-jw5g

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-8wv9-6v69-p7mv

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-998h-6974-69gj

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-9j83-vhw6-vpgq

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

10 days ago

UPDATED

10 days ago

ADVISORY ID

MINI-c26r-mw7j-q57q

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-crhg-jmwj-mmwc

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-f39m-cqxj-3mc8

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-fg83-2gm3-mwq4

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-fhw5-pg3j-jrv8

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-g2ph-9h5w-f7jv

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-g4c5-p968-hmvf

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-g4vr-4p8p-6fhm

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-g6pc-wj8x-j3xw

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-gcpj-xfx3-cmm3

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-h33c-wmmm-q9xg

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-h8ff-gf6v-fg3q

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-hhrc-8h27-x948

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-hhv2-gprv-48mg

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-hmc3-6c77-5vx5

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-hp7r-3fp3-3592

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

10 days ago

UPDATED

10 days ago

ADVISORY ID

MINI-hr3j-mf72-3fh9

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-j7hf-g8qf-35r6

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-j9h3-q692-rjp8

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-jhmh-8rm2-6jp7

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-jv36-5v6j-xv7h

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-jxgh-6wcp-mvfj

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-m8h9-gxgg-2952

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-p2xq-wq7x-4wg5

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-p7gh-f239-5jmg

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-pgr8-489c-qwwx

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-r4ph-w8mm-mw35

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

2 months ago

UPDATED

2 months ago

ADVISORY ID

MINI-rgq4-h7w7-c4j6

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-v5c2-xv87-2vpj

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-vw9h-w284-gq7c

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-w24g-v968-w8p7

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-w85g-fjqg-cmhq

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-wvgp-g668-3g5g

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-xh5p-c88x-wgpp

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

3 months ago

UPDATED

3 months ago

ADVISORY ID

MINI-xhjg-65pf-m5jj

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

minimos

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-xq43-hchm-5xr2

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

CVE-2026-45673

Summary

Summary

Details

Impact

Common Weakness Enumeration (CWE)

CWE-330⁠

CWE-340⁠

CWE-330⁠

CWE-340⁠

CWE-1241⁠

Advisories

NIST

CVSS SCORE

GitHub

CVSS SCORE

Debian

Ubuntu

CVSS SCORE

Red Hat

CVSS SCORE

Chainguard

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

minimos

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