CVE-2026-63362

MEDIUMPre-NVD 5.95.9
EchelonGraph scoreMEDIUM confidence

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

Score 5.9 from GitHub Security Advisory (severity: HIGH) published 2026-07-31. A secondary CVSS source baseline 5.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-51336 (ENISA EUVD) · GHSA-qv76-j3j3-2f94 (GitHub Security Advisories)Source: ENISA EUVD

5.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.8%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100

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)
Severity59% × 45%
Impact severity (EG Severity): CVSS 5.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.8% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
1.8%
EPSS %ILE
78th
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 (5.9): severity, escalated by confirmed exploitation. This CVE's 5.9 is its impact severity (EG Severity), not escalated.

EG Severity
5.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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 30, 2026

Last Modified

October 23, 2026

Advisory Details (7)

Auto-updated Jul 30, 2026
Patch available. Sources: github_pr, cisa.
Web page

CSAF/csaf_files/OT/white/2026/icsa-26-211-08.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-211-08.json
GitHub pull request Patch Available

fix(server): migrate samplingMonitoredItems in TransferSubscriptions

Patch available: open62541/open62541 v1.3.19 (PR #8238 merged 2026-07-23)

https://github.com/open62541/open62541/pull/8238/commits/afab4107bfd161da9ce8bb30ed77f3968c9c97df
GitHub pull request Patch Available

fix(pubsub): check message length before signature size subtraction

Patch available: open62541/open62541 v1.5.6 (PR #8237 merged 2026-07-24)

https://github.com/open62541/open62541/pull/8237/commits/1b71d9c5d9c4d02d4729b8903a52e9f530bf804e
GitHub pull request Patch Available

fix(pubsub): check message length before signature size subtraction

Patch available: open62541/open62541 v1.3.19 (PR #8236 merged 2026-07-23)

https://github.com/open62541/open62541/pull/8236/commits/06b99fef667c8ec5bdf0605b4f00c84fcc1d3a60
GitHub pull request Patch Available

fix(core): reject overflowing arrayDimensions product in Variant en/d…

Patch available: open62541/open62541 v1.3.19 (PR #8235 merged 2026-07-23)

https://github.com/open62541/open62541/pull/8235/commits/b666d35769ce63998442e4d0810a3fb10b50179f
Web page

Contact | o6 Automation Website

https://www.o6-automation.com/contact

Vendor Advisories for CVE-2026-63362(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 rangeFix by version rangeDependents
open625411.4.11.1-1, 1.4.18-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
open625411.4.11.1-1, 1.4.18-1
  • every version on: no fix on record
—

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 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 206 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 106 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  3. 2026-10-30 16:34 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  4. 2026-10-29 16:41 UTCEG score recompute
  5. 2026-10-29 16:41 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  10. 2026-10-25 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  11. 2026-10-25 14:13 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  13. 2026-10-23 23:31 UTCEG score recompute
  14. 2026-10-23 23:31 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  15. 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  16. 2026-10-22 19:49 UTCEG score recompute
  17. 2026-10-22 19:49 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  18. 2026-10-22 16:35 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  19. 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  20. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  21. 2026-10-19 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  22. 2026-10-18 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  23. 2026-10-18 03:23 UTCEG score recompute
  24. 2026-10-17 16:35 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  25. 2026-10-16 16:43 UTCEPSS rescoreEPSS 1.8% · 78th percentile
Show 75 more
  1. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  2. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  5. 2026-10-12 15:49 UTCEG score recompute
  6. 2026-10-11 19:33 UTCEG score recompute
  7. 2026-10-11 16:48 UTCEG score recompute
  8. 2026-10-11 14:10 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  14. 2026-10-06 23:52 UTCEG score recompute
  15. 2026-10-06 23:52 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  17. 2026-10-05 19:58 UTCEG score recompute
  18. 2026-10-05 19:58 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  19. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  21. 2026-10-04 06:35 UTCEG score recompute
  22. 2026-10-04 06:35 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.8% · 78th percentile
  25. 2026-10-02 16:54 UTCEG score recompute
  26. 2026-10-02 16:54 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  28. 2026-10-01 02:50 UTCEG score recompute
  29. 2026-10-01 02:50 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  30. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  31. 2026-09-29 06:52 UTCEG score recompute
  32. 2026-09-29 06:52 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  33. 2026-09-27 18:58 UTCEG score recompute
  34. 2026-09-27 18:58 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  35. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  36. 2026-09-25 04:55 UTCEG score recompute
  37. 2026-09-25 04:55 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  38. 2026-09-23 21:27 UTCEG score recompute
  39. 2026-09-23 21:27 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  40. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  41. 2026-09-22 15:11 UTCEG score recompute
  42. 2026-09-22 15:11 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  43. 2026-09-20 03:40 UTCEG score recompute
  44. 2026-09-20 03:40 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  45. 2026-09-19 04:11 UTCEG score recompute
  46. 2026-09-19 04:11 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  47. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  48. 2026-09-18 02:58 UTCEG score recompute
  49. 2026-09-18 02:58 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  50. 2026-09-17 04:15 UTCEG score recompute
  51. 2026-09-17 04:15 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  52. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  53. 2026-09-16 05:31 UTCEG score recompute
  54. 2026-09-16 05:31 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  55. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  56. 2026-09-15 03:12 UTCEG score recompute
  57. 2026-09-15 03:12 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  58. 2026-09-14 02:13 UTCEG score recompute
  59. 2026-09-14 02:13 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  60. 2026-09-13 03:31 UTCEG score recompute
  61. 2026-09-13 03:31 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  62. 2026-09-12 04:48 UTCEG score recompute
  63. 2026-09-12 04:48 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  64. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  65. 2026-09-11 09:37 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  66. 2026-09-11 06:05 UTCEG score recompute
  67. 2026-09-11 06:05 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  68. 2026-09-10 06:57 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  69. 2026-09-09 07:09 UTCEG score recompute
  70. 2026-09-09 07:09 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  71. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  72. 2026-09-07 19:43 UTCEG score recompute
  73. 2026-09-07 19:43 UTCGHSA enrichmentGHSA-qv76-j3j3-2f94 · GitHub severity HIGH · GitHub CVSS 5.9
  74. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.5% · 72nd percentile
  75. 2026-09-06 17:31 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-63362?
CVE-2026-63362 is a medium-severity vulnerability; its CVE record was published on July 30, 2026. An unsigned integer underflow in the PubSub signature verification path in open62541 may allow a remote attacker to cause a denial of service via a crafted UDP packet.
When was the CVE record for CVE-2026-63362 published?
The CVE record for CVE-2026-63362 was published on July 30, 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 October 23, 2026; the record at its source may have been updated since.
Is CVE-2026-63362 actively exploited?
CVE-2026-63362 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.8% probability of exploitation in the next 30 days (78th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-63362?
CVE-2026-63362 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-63362?
A fix for CVE-2026-63362 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-63362 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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