CVE-2026-56745

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.6% (49th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-46452 (ENISA EUVD) · GHSA-jppx-w49h-x2qq (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec allocates a pooled ByteBuf when processing a client-initiated SYN_STREAM frame with FLAG_FIN=0 and stores the partially constructed FullHttpRequest in messageMap; when the remote peer sends RST_STREAM for that stream or the accumulated content exceeds maxContentLength, the decoder removes the entry but does not release the pooled ByteBuf, causing native memory exhaustion. 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 49/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
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
0.6%
EPSS %ILE
49th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 21, 2026

Last Modified

July 30, 2026

Advisory Details (5)

Auto-updated Jul 22, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

[SpdyHttpDecoder] ByteBuf Reference Leak on RST_STREAM Leads to Native Memory Exhaustion · Advisory · netty/netty · GitHub

https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qq
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

Patch Availability(13)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhoai/odh-trustyai-service-rhel9:17917925252026-10-19redhat
redhatnetty-codec-http2026-10-06redhat
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.el10eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el9eap2026-09-22redhat
redhatio.netty/netty-codec-http:4.1.136.Final-redhat-000012026-09-22redhat
redhatdatagrid-8/datagrid-82026-09-21redhat
redhatdevspaces/server-rhel9:17891637982026-09-17redhat
redhatcryostat/jfr-datasource-rhel9:4.2.0-142026-09-16redhat
redhatrhoai/odh-trustyai-service-rhel9:17881986812026-09-08redhat
redhatdevspaces/pluginregistry-rhel9:17877597232026-09-01redhat
redhatpatch2026-08-05redhat
redhatpatch2026-08-05redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
netty1:4.1.48-10 ... 1:4.1.48-9 (16 versions)
  • every version on: no fix on record
—
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-http4.1.0.Final ... 4.1.99.Final (136 versions)
  • 4.2.0.Final up to 4.2.16.Final: fixed in 4.2.16.Final
  • 4.1.0.Final 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.

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 10× in last 7d / 46× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 244 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 144 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  2. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  3. 2026-10-25 14:18 UTCEG score recompute
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  5. 2026-10-24 00:59 UTCEG score recompute
  6. 2026-10-24 00:59 UTCVendor advisory
  7. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  9. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  12. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  13. 2026-10-18 03:29 UTCEG score recompute
  14. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  15. 2026-10-17 02:54 UTCEG score recompute
  16. 2026-10-17 02:54 UTCVendor advisory
  17. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  19. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-10-12 15:54 UTCEG score recompute
  23. 2026-10-11 19:38 UTCEG score recompute
  24. 2026-10-11 16:53 UTCEG score recompute
  25. 2026-10-11 14:16 UTCEG score recompute
Show 75 more
  1. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-04 14:45 UTCEG score recompute
  10. 2026-10-04 14:45 UTCVendor advisory
  11. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  12. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-01 07:24 UTCEG score recompute
  15. 2026-10-01 07:24 UTCVendor advisory
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  17. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  19. 2026-09-28 06:03 UTCEG score recompute
  20. 2026-09-28 06:03 UTCVendor advisory
  21. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-09-24 03:19 UTCEG score recompute
  25. 2026-09-24 03:19 UTCVendor advisory
  26. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  27. 2026-09-23 01:21 UTCEG score recompute
  28. 2026-09-23 01:21 UTCVendor advisory
  29. 2026-09-20 05:53 UTCEG score recompute
  30. 2026-09-20 05:53 UTCVendor advisory
  31. 2026-09-19 00:19 UTCEG score recompute
  32. 2026-09-19 00:19 UTCVendor advisory
  33. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  34. 2026-09-18 03:46 UTCEG score recompute
  35. 2026-09-18 03:46 UTCVendor advisory
  36. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  37. 2026-09-17 05:04 UTCEG score recompute
  38. 2026-09-17 05:04 UTCVendor advisory
  39. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  40. 2026-09-16 12:33 UTCEG score recompute
  41. 2026-09-16 12:33 UTCVendor advisory
  42. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  43. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  44. 2026-09-14 10:19 UTCVendor advisory
  45. 2026-09-13 22:38 UTCEG score recompute
  46. 2026-09-13 22:38 UTCVendor advisory
  47. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  48. 2026-09-13 08:23 UTCVendor advisory
  49. 2026-09-12 21:12 UTCEG score recompute
  50. 2026-09-12 21:12 UTCVendor advisory
  51. 2026-09-12 09:44 UTCVendor advisory
  52. 2026-09-11 20:30 UTCEG score recompute
  53. 2026-09-11 20:30 UTCVendor advisory
  54. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  55. 2026-09-11 08:52 UTCEG score recompute
  56. 2026-09-11 08:52 UTCVendor advisory
  57. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  58. 2026-09-09 11:10 UTCEG score recompute
  59. 2026-09-09 11:10 UTCVendor advisory
  60. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  61. 2026-09-07 22:27 UTCEG score recompute
  62. 2026-09-07 22:27 UTCVendor advisory
  63. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  64. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  65. 2026-09-06 10:39 UTCVendor advisory
  66. 2026-09-05 19:50 UTCEG score recompute
  67. 2026-09-05 19:50 UTCVendor advisory
  68. 2026-09-05 08:24 UTCEG score recompute
  69. 2026-09-05 08:24 UTCVendor advisory
  70. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  71. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  72. 2026-09-02 00:55 UTCEG score recompute
  73. 2026-09-02 00:55 UTCVendor advisory
  74. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  75. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.6% · 46th percentile

Frequently asked(5)

What is CVE-2026-56745?
CVE-2026-56745 is a high-severity vulnerability; its CVE record was published on July 21, 2026. Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the SpdyHttpDecoder handler in Netty's SPDY-to-HTTP codec allocates a pooled ByteBuf when processing a client-initiated…
When was the CVE record for CVE-2026-56745 published?
The CVE record for CVE-2026-56745 was published on July 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 30, 2026; the record at its source may have been updated since.
Is CVE-2026-56745 actively exploited?
CVE-2026-56745 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56745?
CVE-2026-56745 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-56745?
A fix for CVE-2026-56745 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56745 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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