CVE-2026-73508

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed to release retained or newly allocated ByteBuf objects when IDN.toASCII() or encodeDomainName() rejected a malformed domain name, allowing unauthenticated remote DNS packets to leak direct memory incrementally until denial of service. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 24, 2026

Last Modified

September 23, 2026

Advisory Details (5)

Auto-updated Aug 13, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Memory Leak in DNS Record Decoder via Malformed Domain Names · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-mfg7-5gfp-c4w3
github_release Patch Available

netty-4.2.16.Final

Patch available: netty/netty netty-4.2.16.Final

https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
github_release Patch Available

netty-4.1.136.Final

Patch available: netty/netty netty-4.1.136.Final

https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
github_commit Patch Available

commit bb2ff68a1fb7 (netty/netty)

Patch available: netty/netty netty-4.1.136.Final (contains commit bb2ff68a1fb7)

https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
github_commit Patch Available

commit 5b68c61f37aa (netty/netty)

Patch available: netty/netty netty-4.2.16.Final (contains commit 5b68c61f37aa)

https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b

Vendor Advisories for CVE-2026-73508(7)

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

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el10eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el8eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el9eap2026-09-22redhat
redhatnetty-codec-dns2026-09-21redhat
redhatdevspaces/pluginregistry-rhel9:17888831792026-09-17redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (12 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-16 (7 versions)
  • every version on: no fix on record
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
io.netty:netty-codec-dns4.1.0.Beta1 ... 4.1.99.Final (151 versions)
  • 4.2.0.Final up to 4.2.16.Final: fixed in 4.2.16.Final
  • every version up to 4.1.136.Final: fixed in 4.1.136.Final
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 47× 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.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:13 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
  4. 2026-10-06 15:18 UTCEPSS rescore
  5. 2026-10-05 17:43 UTCEPSS rescore
  6. 2026-10-04 23:22 UTCEPSS rescore
  7. 2026-10-04 07:42 UTCEG score recompute
  8. 2026-10-04 07:42 UTCVendor advisory
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-03 03:18 UTCEG score recompute
  11. 2026-10-03 03:18 UTCVendor advisory
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 05:59 UTCEG score recompute
  14. 2026-10-01 05:59 UTCVendor advisory
  15. 2026-09-29 15:24 UTCEPSS rescore
  16. 2026-09-28 13:52 UTCEPSS rescore
  17. 2026-09-28 04:27 UTCEG score recompute
  18. 2026-09-28 04:27 UTCVendor advisory
  19. 2026-09-27 13:48 UTCEPSS rescore
  20. 2026-09-26 15:59 UTCEPSS rescore
  21. 2026-09-25 10:04 UTCEG score recompute
  22. 2026-09-25 10:04 UTCVendor advisory
  23. 2026-09-24 03:03 UTCEG score recompute
  24. 2026-09-24 03:03 UTCVendor advisory
  25. 2026-09-23 17:54 UTCEPSS rescore
Show 70 more
  1. 2026-09-23 16:00 UTCEG score recompute▲ 2.20
  2. 2026-09-23 16:00 UTCVendor advisory
  3. 2026-09-23 15:56 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  4. 2026-09-22 22:11 UTCEG score recompute
  5. 2026-09-22 22:11 UTCVendor advisory
  6. 2026-09-21 21:09 UTCEPSS rescore
  7. 2026-09-20 20:16 UTCEPSS rescore
  8. 2026-09-20 01:39 UTCEG score recompute
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 10:55 UTCEG score recompute
  11. 2026-09-17 09:14 UTCEG score recompute
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 06:39 UTCEG score recompute
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 08:40 UTCEG score recompute
  17. 2026-09-13 06:59 UTCEG score recompute
  18. 2026-09-12 15:02 UTCEPSS rescore
  19. 2026-09-12 05:05 UTCEG score recompute
  20. 2026-09-11 14:53 UTCEPSS rescore
  21. 2026-09-11 02:32 UTCEG score recompute
  22. 2026-09-10 09:35 UTCEPSS rescore
  23. 2026-09-09 08:44 UTCEG score recompute
  24. 2026-09-08 22:01 UTCEPSS rescore
  25. 2026-09-07 21:23 UTCEG score recompute
  26. 2026-09-06 13:48 UTCEPSS rescore
  27. 2026-09-05 19:23 UTCEG score recompute
  28. 2026-09-04 12:49 UTCEG score recompute
  29. 2026-09-04 05:07 UTCEPSS rescore
  30. 2026-09-02 14:12 UTCEPSS rescore
  31. 2026-09-01 23:15 UTCEG score recompute
  32. 2026-09-01 13:54 UTCEPSS rescore
  33. 2026-09-01 04:40 UTCEPSS rescore
  34. 2026-09-01 04:40 UTCEPSS rescore
  35. 2026-08-31 01:58 UTCEG score recompute
  36. 2026-08-30 19:18 UTCEPSS rescore
  37. 2026-08-30 19:17 UTCEPSS rescore
  38. 2026-08-30 01:22 UTCEPSS rescore
  39. 2026-08-30 00:16 UTCEG score recompute
  40. 2026-08-28 21:42 UTCEPSS rescore
  41. 2026-08-27 21:33 UTCEG score recompute
  42. 2026-08-27 14:25 UTCEPSS rescore
  43. 2026-08-26 19:52 UTCEG score recompute
  44. 2026-08-26 14:47 UTCEPSS rescore
  45. 2026-08-25 13:51 UTCEG score recompute
  46. 2026-08-25 13:49 UTCEPSS rescore
  47. 2026-08-24 12:10 UTCEG score recompute
  48. 2026-08-23 10:24 UTCEG score recompute
  49. 2026-08-23 00:19 UTCEPSS rescore
  50. 2026-08-22 08:39 UTCEG score recompute
  51. 2026-08-21 23:49 UTCEPSS rescore
  52. 2026-08-21 06:58 UTCEG score recompute
  53. 2026-08-20 22:56 UTCEPSS rescore
  54. 2026-08-20 05:17 UTCEG score recompute
  55. 2026-08-19 17:04 UTCEPSS rescore
  56. 2026-08-19 03:35 UTCEG score recompute
  57. 2026-08-18 13:49 UTCEPSS rescore
  58. 2026-08-18 13:49 UTCEPSS rescore
  59. 2026-08-18 01:26 UTCEG score recompute
  60. 2026-08-17 13:47 UTCEPSS rescore
  61. 2026-08-16 23:23 UTCEG score recompute
  62. 2026-08-16 14:56 UTCEPSS rescore
  63. 2026-08-16 14:56 UTCEPSS rescore
  64. 2026-08-16 02:15 UTCEPSS rescore
  65. 2026-08-15 21:42 UTCEG score recompute
  66. 2026-08-15 01:31 UTCEPSS rescore
  67. 2026-08-13 18:19 UTCEG score recompute
  68. 2026-08-13 18:12 UTCEG score recompute
  69. 2026-08-13 15:28 UTCEG score recompute
  70. 2026-08-13 14:52 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-73508?
CVE-2026-73508 is a high vulnerability published on July 24, 2026. Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.dns.AbstractDnsRecord, io.netty.handler.codec.dns.DefaultDnsRecordDecoder.decodeRecord(), and io.netty.handler.codec.dns.DnsCodecUtil.decompressDomainName() failed…
When was CVE-2026-73508 disclosed?
CVE-2026-73508 was first published on July 24, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73508 actively exploited?
CVE-2026-73508 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73508?
CVE-2026-73508 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73508?
A fix for CVE-2026-73508 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73508 are linked in the Vendor Advisories panel on this page.

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