CVE-2026-104355

HIGHPre-NVD 7.07.0
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-97768 (ENISA EUVD) · GHSA-vvgp-p2h7-g3xf (GitHub Security Advisories)Source: ENISA EUVD

7.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A connected peer cluster can modify a Temporal Server cluster's local namespaces, which are never replicated to that peer, because the receiving cluster applies inbound namespace replication updates to them. In a multi-cluster deployment, each cluster pulls replication tasks from the remote clusters an administrator has registered with connection enabled; the sending side excludes local namespaces, but the receiving side does not apply the same rule. When an inbound task names an existing namespace, the server checks at most that the namespace identifiers match, then overwrites its state, description, owner, retention, archival settings, and cluster list, and its active cluster when the task carries a higher failover version, without checking that the namespace is global. A party that controls a registered peer's replies, by operating or compromising it, can therefore change any local namespace whose name and identifier it can supply, without any credential on the receiving cluster: for example, marking it Deprecated, making the peer its active cluster, and shortening its retention, after which new Workflow starts in that namespace fail. Local namespaces include the built-in temporal-system namespace. Namespace metadata the History service refreshes from the peer while processing its history replication tasks passes through the same logic. A cluster with no remote cluster registered with connection enabled is not exposed.

CVSS v3
7.0
EG Score
7.0HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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)
Severity70% × 45%
Impact severity (EG Severity): CVSS 7.0 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 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
0.4%
EPSS %ILE
29th
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 (7.0): severity, escalated by confirmed exploitation. This CVE's 7.0 is its impact severity (EG Severity), not escalated.

EG Severity
7.0 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-27). 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

October 12, 2026

Last Modified

October 16, 2026

Advisory Details (9)

Auto-updated Oct 16, 2026
Patch available. Sources: github_pr, github_commit, github_release.
GitHub release Patch Available

v1.32.1

Patch available: temporalio/temporal v1.32.1

https://github.com/temporalio/temporal/releases/tag/v1.32.1
GitHub release Patch Available

v1.31.4

Patch available: temporalio/temporal v1.31.4

https://github.com/temporalio/temporal/releases/tag/v1.31.4
GitHub release Patch Available

v1.30.8

Patch available: temporalio/temporal v1.30.8

https://github.com/temporalio/temporal/releases/tag/v1.30.8
GitHub pull request

Backport #12323 to release/v1.30.x

Fix merged in temporalio/temporal PR #12330 on 2026-10-06 — awaiting tagged release

https://github.com/temporalio/temporal/pull/12330
GitHub pull request

Backport #12323 to release/v1.31.x

Fix merged in temporalio/temporal PR #12329 on 2026-10-06 — awaiting tagged release

https://github.com/temporalio/temporal/pull/12329
GitHub pull request

Backport #12323 to release/v1.32.x

Fix merged in temporalio/temporal PR #12328 on 2026-10-06 — awaiting tagged release

https://github.com/temporalio/temporal/pull/12328
GitHub commit

commit f2b571e2eee8 (temporalio/temporal)

Fix landed in temporalio/temporal commit f2b571e2eee8 — awaiting tagged release

https://github.com/temporalio/temporal/commit/f2b571e2eee8a9143fbc4711f3db8b5a37146b3b
GitHub pull request

Strengthen local namespace replication

Fix merged in temporalio/temporal PR #12323 on 2026-10-06 — awaiting tagged release

https://github.com/temporalio/temporal/pull/12323
Web page

temporal/common/namespace/replicationTaskExecutor.go at v1.0.0 · temporalio/temporal · GitHub

https://github.com/temporalio/temporal/blob/v1.0.0/common/namespace/replicationTaskExecutor.go#L191-L260

Vendor Advisories for CVE-2026-104355(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 34× 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.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  6. 2026-10-27 20:37 UTCEG score recompute
  7. 2026-10-27 20:36 UTCGHSA enrichmentGHSA-vvgp-p2h7-g3xf · GitHub severity HIGH
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-25 14:55 UTCEG score recompute
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-20 19:14 UTCEG score recompute
  17. 2026-10-20 19:14 UTCGHSA enrichmentGHSA-vvgp-p2h7-g3xf · GitHub severity HIGH
  18. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-10-18 05:09 UTCEG score recompute
  22. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-10-16 20:11 UTCGHSA enrichmentGHSA-vvgp-p2h7-g3xf · GitHub severity HIGH
  24. 2026-10-16 18:32 UTCEG score recompute
  25. 2026-10-16 18:32 UTCGHSA enrichmentGHSA-vvgp-p2h7-g3xf · GitHub severity HIGH
Show 9 more
  1. 2026-10-16 17:59 UTCEG score recompute
  2. 2026-10-16 17:59 UTCGHSA enrichmentGHSA-vvgp-p2h7-g3xf · GitHub severity HIGH
  3. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  7. 2026-10-12 19:25 UTCEG score recompute
  8. 2026-10-12 18:57 UTCEG score recomputeFirst assessed: 7.0 HIGH
  9. 2026-10-12 18:55 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-104355?
CVE-2026-104355 is a high-severity vulnerability; its CVE record was published on October 12, 2026. A connected peer cluster can modify a Temporal Server cluster's local namespaces, which are never replicated to that peer, because the receiving cluster applies inbound namespace replication updates to them. In a multi-cluster deployment, each cluster pulls replication tasks from the remote…
When was the CVE record for CVE-2026-104355 published?
The CVE record for CVE-2026-104355 was published on October 12, 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 16, 2026; the record at its source may have been updated since.
Is CVE-2026-104355 actively exploited?
CVE-2026-104355 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-104355?
CVE-2026-104355 has a CVSS base score of 7.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-104355?
A fix for CVE-2026-104355 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-104355 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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