CVE-2026-123572 json
Hickory-dns 0.20.1 before 0.26.2 Panic DoS via SVCB/HTTPS Zone Parser
published 2mo ago modified 1h ago also EUVD-2026-119331 , GHSA-hx8c-fjhc-hmf5 , RUSTSEC-2026-0487
- 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, which panics on malformed alpn values. Attackers can supply untrusted zone files with unbalanced quotes, consecutive commas, or invalid escapes in alpn parameters to crash parsing processes.
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-2026-123572
Is CVE-2026-123572 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 | >=0.20.1, <0.26.2 |
0.26.2 |
Affected products
- hickory-dns hickory-dns
Classification
- Weakness
-
- CWE-1286 Improper Validation of Syntactic Correctness of Input
References
-
github.com
/hickory-dns/hickory-dns/commit/80eaf9e79f7561e2bc1cf5b89eaba7fd25de3284
web
-
github.com
/hickory-dns/hickory-dns/security/advisories/GHSA-hx8c-fjhc-hmf5
vendor-advisory, advisory
-
vulncheck.com
/advisories/hickory-dns-0.20.1-before-0.26.2-panic-dos-via-svcb-https-zone-parser
third-party-advisory
-
crates.io
/crates/hickory-proto
package
-
rustsec.org
/advisories/RUSTSEC-2026-0487.html
advisory
Sources
- CVE List CVE-2026-123572
- NVD CVE-2026-123572
- OSV RUSTSEC-2026-0487
- Maintainer advisory GHSA-hx8c-fjhc-hmf5
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.