CVE-2026-123574 json
Hickory DNS 0.24.0 before 0.26.2 Denial of Service via Zone File Parser
published 2mo ago modified 1h ago also EUVD-2026-119333 , GHSA-4rph-pmrw-mwpw , RUSTSEC-2026-0490
- 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
The zone file parser in the hickory-proto crate of Hickory DNS 0.24.0 before 0.26.2 panics when a single token in a zone file is 4096 bytes or longer. Attackers who can supply untrusted zone files to an application using the parser can trigger the panic to cause a denial of service.
Patch / fix
- crates.io hickory-proto 0.26.2
- hickory-dns hickory-dns 0.26.2
- rust-hickory-proto Debian 14 0.26.3-1
debian advisories DEBIAN-CVE-2026-123574
Is CVE-2026-123574 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 FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2d ago
Exploit 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | hickory-proto | >=0.24.0, <0.26.2 |
0.26.2 |
Affected products
- hickory-dns hickory-dns
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
github.com
/hickory-dns/hickory-dns/commit/0494e15c88fba612f9ecb4f013eb3b221822c867
web
-
github.com
/hickory-dns/hickory-dns/security/advisories/GHSA-4rph-pmrw-mwpw
vendor-advisory, advisory
-
vulncheck.com
/advisories/hickory-dns-0.24.0-before-0.26.2-denial-of-service-via-zone-file-parser
third-party-advisory
-
crates.io
/crates/hickory-proto
package
-
rustsec.org
/advisories/RUSTSEC-2026-0490.html
advisory
Sources
- CVE List CVE-2026-123574
- NVD CVE-2026-123574
- OSV RUSTSEC-2026-0490
- Maintainer advisory GHSA-4rph-pmrw-mwpw
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.
The maintainers of hickory-dns/hickory-dns published their own advisory on GitHub. Reviewed sources take precedence over it.