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(13)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsutils (1:9.18.39-0ubuntu0.22.04.5) @ jammy2026-09-18ubuntu
redhatrhcos-418.94.202609031320-02026-09-17redhat
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
redhatbind9.18-32:9.18.29-14.el9_8.82026-08-17redhat
redhatbind-32:9.16.23-31.el9_6.42026-08-17redhat
redhatbind-32:9.18.33-15.el10_2.102026-08-17redhat
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

(2)

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 26× in last 7d / 118× 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 247 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 86.8% 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

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