CVE-2026-64193

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-20. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR.

Net::DNS::RR::OPT::EXTENDED_ERROR::_decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some escaping done for $ and @, but not for backticks. This can be exploited for command execution if $pkt->edns->option('EXTENDED-ERROR') is called in array context, for example with a payload of {0:""} in EXTRA-TEXT.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

July 20, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-64193: Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR

http://www.openwall.com/lists/oss-security/2026/07/20/12
generic

Net::DNS

https://www.net-dns.org/blog/#release-candidate-for-netdns-1.56
generic

Changes - metacpan.org

https://metacpan.org/release/NLNETLABS/Net-DNS-1.55_01/changes

Vendor Advisories for CVE-2026-64193(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libnet-dns-perl1.50-1, 1.53-1, 1.54-1, 1.55-11.56-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libnet-dns-perl1.50-1, 1.53-1, 1.54-1, 1.55-11.56-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 143× 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 536 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64193?
CVE-2026-64193 is a critical vulnerability published on July 20, 2026. Net::DNS versions through 1.55 for Perl allow remote execution injection via EDNS EXTENDED ERROR. Net::DNS::RR::OPT::EXTENDEDERROR::decompose parses the EXTRA-TEXT field of an EDNS EXTENDED-ERROR option (RFC 8914) by tokenising the raw bytes and passing the result to Perl's eval. There is some…
When was CVE-2026-64193 disclosed?
CVE-2026-64193 was first published in the National Vulnerability Database on July 20, 2026, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64193 actively exploited?
CVE-2026-64193 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 46.0% of all scored CVEs.
What is the CVSS score of CVE-2026-64193?
CVE-2026-64193 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-64193?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64193, 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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