CVE-2026-123573 json
hickory-dns from 0.20.1 before 0.26.2 Panic in SVCB/HTTPS Zone File Parser
published 2mo ago modified 54m ago also EUVD-2026-119332 , GHSA-wgfr-mphw-j5g4 , RUSTSEC-2026-0489
- 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 from 0.20.1 before 0.26.2 contains a denial of service vulnerability in the hickory-proto SVCB and HTTPS record presentation format parser. Attackers can supply untrusted zone files where only a single or double quote replaces a service parameter value, triggering a panic that crashes the parsing process.
Patch / fix
- crates.io hickory-proto 0.26.2
- hickory-dns hickory-dns 0.26.2
- rust-hickory-dns Debian 14 0.26.3-1
debian advisories DEBIAN-CVE-2026-123573
Is CVE-2026-123573 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
- yesterday
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 | >=0.20.1, <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/c663b60a4b4b98deb45d16ccbf10ce2f76cd88a9
web
-
github.com
/hickory-dns/hickory-dns/security/advisories/GHSA-wgfr-mphw-j5g4
vendor-advisory, advisory
-
vulncheck.com
/advisories/hickory-dns-from-0.20.1-before-0.26.2-panic-in-svcb-https-zone-file-parser
third-party-advisory
-
crates.io
/crates/hickory-proto
package
-
rustsec.org
/advisories/RUSTSEC-2026-0489.html
advisory
Sources
- CVE List CVE-2026-123573
- NVD CVE-2026-123573
- OSV RUSTSEC-2026-0489
- Maintainer advisory GHSA-wgfr-mphw-j5g4
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.