When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function…
Priority LOW 31CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.
Summary
When ldns version 1.7.1 verifies a zone file, the ldns_rr_new_frm_str_internal function has a heap out of bounds read vulnerability. An attacker can leak information on the heap by constructing a zone file payload.
Why it matters now
EPSS 0.01215 68th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
Not affected: 1 product
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2020-19860
- 2026-10-03 Alias added: GHSA-x6hf-28q4-37gq
References
More NLNETLABS Ldns vulnerabilities
- TI-2017-14547 A double-free vulnerability in parse.c in ldns 1.7.0 have unspecified impact and attack vectors. CVSS 3.0CRITICAL 9.8
- TI-2017-14548 A double-free vulnerability in str2host.c in ldns 1.7.0 have unspecified impact and attack vectors. CVSS 3.0CRITICAL 9.8
- TI-2011-03157 Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns before… CVSS 2.0MEDIUM 6.8
- TI-2020-13719 When a zone file in ldns 1.7.1 is parsed, the function ldns_nsec3_salt_data is too… CVSS 3.1HIGH 7.5
- TI-2026-09311 Insufficient verification that responses belong to a query CVSS 4.0HIGH 8.2
- TI-2009-01040 Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x… CVSS 2.0MEDIUM 6.4
Sources
- CVE-2020-19860 · CVE Program
- CVE-2020-19860 · NVD
- FIRST EPSS
- GHSA-x6hf-28q4-37gq · GitHub Advisory Database · CC BY 4.0
- CVE-2020-19860 · Red Hat security data · CC BY 4.0
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