CVE-2026-13321

HIGHPre-NVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

Score 8.6 from GitHub Security Advisory (severity: HIGH) published 2026-07-22. a secondary CVSS source baseline 8.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — Patch released this week
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.6Exploit: None knownExposed: 0

A fix is available — apply it.

The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.

CVSS v3
8.6
EG Score
8.6(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity86% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 22, 2026

Advisory Details (3)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic

CVE-2026-13321: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

https://kb.isc.org/docs/cve-2026-13321
generic

Index of /isc/bind9/9.21.24

https://downloads.isc.org/isc/bind9/9.21.24
generic

Index of /isc/bind9/9.20.26

https://downloads.isc.org/isc/bind9/9.20.26

Vendor Advisories for CVE-2026-13321(13)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntubind9-utils (1:9.20.24-1ubuntu0.2) @ resolute2026-09-14ubuntu
redhatrhcos-416.94.202609011112-02026-09-10redhat
redhatbind-32:9.11.4-26.P2.el7_9.212026-08-26redhat
redhatrhcos-4.22.9.8.202608191915-02026-08-25redhat
redhatbind-32:9.16.23-18.el9_4.122026-08-19redhat
redhatbind-32:9.18.33-15.el10_2.102026-08-17redhat
redhatbind9.18-32:9.18.29-14.el9_8.82026-08-17redhat
redhatbind-32:9.16.23-31.el9_6.42026-08-17redhat
redhatbind-32:9.16.23-40.el9_8.82026-08-13redhat
redhatbind-32:9.11.36-16.el8_10.142026-08-13redhat
redhatbind9.16-32:9.16.23-0.22.el8_10.122026-08-13redhat
redhatbind-main-9.20.26-0.1.hum12026-08-12redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.26-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.26-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
bind—9.20.26-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
bind91:9.16.15-1 ... 1:9.16.50-1~deb11u5 (17 versions)1:9.16.50-1~deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
bind91:9.18.12-1 ... 1:9.18.49-1~deb12u1 (16 versions)1:9.18.49-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
bind91:9.20.11-4 ... 1:9.20.26-1~deb13u1~bpo12+1 (21 versions)1:9.20.26-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
bind91:9.20.11-4 ... 1:9.20.26-1~deb13u1~bpo12+1 (22 versions)1:9.20.26-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 27× in last 7d / 128× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 233 total refreshes for this CVE.

  1. 2026-09-14 10:45 UTCVendor advisory
  2. 2026-09-14 10:45 UTCGHSA enrichment
  3. 2026-09-13 22:26 UTCEG score recompute
  4. 2026-09-13 22:26 UTCVendor advisory
  5. 2026-09-13 22:26 UTCGHSA enrichment
  6. 2026-09-13 16:46 UTCEPSS rescore
  7. 2026-09-13 07:14 UTCVendor advisory
  8. 2026-09-13 07:14 UTCGHSA enrichment
  9. 2026-09-12 18:57 UTCEG score recompute
  10. 2026-09-12 18:57 UTCVendor advisory
  11. 2026-09-12 18:57 UTCGHSA enrichment
  12. 2026-09-12 15:00 UTCEPSS rescore
  13. 2026-09-12 06:39 UTCVendor advisory
  14. 2026-09-12 06:39 UTCGHSA enrichment
  15. 2026-09-11 17:52 UTCEG score recompute
  16. 2026-09-11 17:52 UTCVendor advisory
  17. 2026-09-11 17:52 UTCGHSA enrichment
  18. 2026-09-11 14:52 UTCEPSS rescore
  19. 2026-09-11 09:36 UTCEPSS rescore
  20. 2026-09-10 21:33 UTCEG score recompute
  21. 2026-09-10 21:33 UTCVendor advisory
  22. 2026-09-10 21:33 UTCGHSA enrichment
  23. 2026-09-10 09:34 UTCEPSS rescore
  24. 2026-09-09 09:15 UTCEG score recompute
  25. 2026-09-09 09:15 UTCVendor advisory
Show 75 more
  1. 2026-09-09 09:15 UTCGHSA enrichment
  2. 2026-09-08 22:00 UTCEPSS rescore
  3. 2026-09-07 21:41 UTCEG score recompute
  4. 2026-09-07 21:41 UTCVendor advisory
  5. 2026-09-07 21:41 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-06 08:42 UTCVendor advisory
  9. 2026-09-06 08:42 UTCGHSA enrichment
  10. 2026-09-05 19:34 UTCEG score recompute
  11. 2026-09-05 19:34 UTCVendor advisory
  12. 2026-09-05 19:34 UTCGHSA enrichment
  13. 2026-09-05 07:14 UTCEG score recompute
  14. 2026-09-05 07:14 UTCVendor advisory
  15. 2026-09-05 07:14 UTCGHSA enrichment
  16. 2026-09-04 13:54 UTCEG score recompute
  17. 2026-09-04 13:54 UTCVendor advisory
  18. 2026-09-04 13:54 UTCGHSA enrichment
  19. 2026-09-04 05:06 UTCEPSS rescore
  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-01 23:40 UTCEG score recompute
  22. 2026-09-01 23:40 UTCVendor advisory
  23. 2026-09-01 23:40 UTCGHSA enrichment
  24. 2026-09-01 13:53 UTCEPSS rescore
  25. 2026-09-01 04:39 UTCEPSS rescore
  26. 2026-08-31 01:28 UTCEG score recompute
  27. 2026-08-31 01:28 UTCVendor advisory
  28. 2026-08-31 01:28 UTCGHSA enrichment
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 13:11 UTCEG score recompute
  31. 2026-08-30 13:11 UTCVendor advisory
  32. 2026-08-30 13:11 UTCGHSA enrichment
  33. 2026-08-30 01:21 UTCEPSS rescore
  34. 2026-08-30 00:53 UTCEG score recompute
  35. 2026-08-30 00:53 UTCVendor advisory
  36. 2026-08-30 00:53 UTCGHSA enrichment
  37. 2026-08-28 21:40 UTCEPSS rescore
  38. 2026-08-27 22:36 UTCEG score recompute
  39. 2026-08-27 22:36 UTCVendor advisory
  40. 2026-08-27 22:36 UTCGHSA enrichment
  41. 2026-08-27 14:24 UTCEPSS rescore
  42. 2026-08-27 10:19 UTCVendor advisory
  43. 2026-08-27 10:19 UTCGHSA enrichment
  44. 2026-08-26 19:58 UTCEG score recompute
  45. 2026-08-26 19:58 UTCVendor advisory
  46. 2026-08-26 19:58 UTCGHSA enrichment
  47. 2026-08-26 06:54 UTCVendor advisory
  48. 2026-08-26 06:54 UTCGHSA enrichment
  49. 2026-08-25 17:48 UTCEG score recompute
  50. 2026-08-25 17:48 UTCVendor advisory
  51. 2026-08-25 17:48 UTCGHSA enrichment
  52. 2026-08-25 13:48 UTCEPSS rescore
  53. 2026-08-25 04:05 UTCVendor advisory
  54. 2026-08-25 04:05 UTCGHSA enrichment
  55. 2026-08-24 15:49 UTCEG score recompute
  56. 2026-08-24 15:49 UTCVendor advisory
  57. 2026-08-24 15:49 UTCGHSA enrichment
  58. 2026-08-24 03:30 UTCVendor advisory
  59. 2026-08-24 03:30 UTCGHSA enrichment
  60. 2026-08-23 14:09 UTCVendor advisory
  61. 2026-08-23 14:09 UTCGHSA enrichment
  62. 2026-08-23 01:49 UTCEG score recompute
  63. 2026-08-23 01:49 UTCVendor advisory
  64. 2026-08-23 01:49 UTCGHSA enrichment
  65. 2026-08-23 00:19 UTCEPSS rescore
  66. 2026-08-22 13:32 UTCVendor advisory
  67. 2026-08-22 13:32 UTCGHSA enrichment
  68. 2026-08-22 01:12 UTCEG score recompute
  69. 2026-08-22 01:12 UTCVendor advisory
  70. 2026-08-22 01:12 UTCGHSA enrichment
  71. 2026-08-21 23:48 UTCEPSS rescore
  72. 2026-08-21 12:55 UTCVendor advisory
  73. 2026-08-21 12:55 UTCGHSA enrichment
  74. 2026-08-21 00:38 UTCEG score recompute
  75. 2026-08-21 00:38 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-13321?
CVE-2026-13321 is a high vulnerability published on July 22, 2026. The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
When was CVE-2026-13321 disclosed?
CVE-2026-13321 was first published in the National Vulnerability Database on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13321 actively exploited?
CVE-2026-13321 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.0% of all scored CVEs.
What is the CVSS score of CVE-2026-13321?
CVE-2026-13321 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2026-13321?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13321, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-13321

Explore →

Is Your Infrastructure Affected by CVE-2026-13321?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs