CVE-2026-123607 json
Hickory DNS NSEC3 Closest-Encloser Proof Unbounded Loop Denial of Service
published 6mo ago modified yesterday also EUVD-2026-119366 , GHSA-3v94-mw7p-v465 , RUSTSEC-2026-0118 , RUSTSEC-2026-0120
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
Hickory DNS hickory-proto 0.25.0-alpha.3 through 0.25.2 and hickory-net before 0.26.1 contain an unbounded loop vulnerability in DnssecDnsHandle NSEC3 closest-encloser proof validation when the SOA owner is not an ancestor of the QNAME. Upstream attackers can return NoData or NXDomain responses with a cross-zone SOA record to panic debug builds or exhaust memory in release builds.
Patch / fix
- crates.io hickory-proto 0.26.0-beta.1
- crates.io hickory-net 0.26.1
- hickory-dns hickory-dns 0.26.1
- github.com/hickory-dns/hickory-dns#3597 pull request
Is CVE-2026-123607 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerExploit prediction
0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 8.7 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | hickory-proto | >=0.25.0-alpha.3, <=0.25.2 >=0.25.0-alpha.3, <0.26.0-beta.1 |
0.26.0-beta.1 |
| crates.io | hickory-net | >=0.26.0-alpha.1, <0.26.1 >=0.0.0-0, <0.26.1 |
0.26.1 |
Affected products
- hickory-dns hickory-dns
Classification
- Weakness
-
- CWE-835 Loop with Unreachable Exit Condition
References
-
github.com
/hickory-dns/hickory-dns/pull/3597
web
-
github.com
/hickory-dns/hickory-dns/security/advisories/GHSA-3v94-mw7p-v465
vendor-advisory, web
-
vulncheck.com
/advisories/hickory-dns-nsec3-closest-encloser-proof-unbounded-loop-denial-of-service
third-party-advisory
-
github.com
/hickory-dns/hickory-dns
package
-
rustsec.org
/advisories/RUSTSEC-2026-0118.html
web, advisory
-
rustsec.org
/advisories/RUSTSEC-2026-0120.html
web, advisory
-
crates.io
/crates/hickory-proto
package
-
crates.io
/crates/hickory-net
package
Sources
- CVE List CVE-2026-123607
- GitHub Advisory GHSA-3v94-mw7p-v465
- NVD CVE-2026-123607
- OSV RUSTSEC-2026-0118
- OSV RUSTSEC-2026-0120
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.