CVE-2026-119756

CRITICALPre-NVD 9.89.8
EchelonGraph scoreHIGH confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-11-09. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-120125 (ENISA EUVD) · GHSA-6g2f-6p9p-vvm8 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationThe upstream fix is not in a release yet: until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Tasmota through 16.0.0, fixed in commit e97e1e4, contains a heap out-of-bounds write vulnerability in SendReceiveDeviceGroupMessage() that allows unauthenticated attackers on the local network to corrupt heap memory by sending crafted Device Groups messages over UDP port 4447 that cause the log_remaining counter to go negative and writes to exceed the fixed 512-byte buffer. Attackers can exploit this flaw to crash the device or potentially achieve native code execution on ESP8266 and ESP32 platforms that lack ASLR and heap cookies.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 total (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: An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.
EPSS PROB
0.5%
EPSS %ILE
42nd
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.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 low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Until the release ships, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high, then apply it.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (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

November 9, 2026

Last Modified

November 12, 2026

Advisory Details (2)

Auto-updated Nov 9, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
Web page

Tasmota 16.0.0 Heap Out-of-Bounds Write via Device Groups UDP | Advisories | VulnCheck

https://www.vulncheck.com/advisories/tasmota-heap-out-of-bounds-write-via-device-groups-udp
GitHub commit

commit e97e1e4f7e31 (arendst/Tasmota)

Fix landed in arendst/Tasmota commit e97e1e4f7e31 — awaiting tagged release

https://github.com/arendst/Tasmota/commit/e97e1e4f7e319a55caa1613aef1f25fc81bdb554

Vendor Advisories for CVE-2026-119756(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 13× in last 7d / 13× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-11-12 21:08 UTCEchelonGraph re-scored
  3. 2026-11-12 21:08 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-11-12 03:46 UTCEchelonGraph re-scored
  6. 2026-11-12 03:46 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-11-11 02:41 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  9. 2026-11-11 00:52 UTCEchelonGraph re-scored
  10. 2026-11-11 00:52 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-11-09 23:47 UTCEchelonGraph re-scored
  13. 2026-11-09 23:47 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-11-09 22:55 UTCEchelonGraph re-scored
  15. 2026-11-09 22:55 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  16. 2026-11-09 18:45 UTCEchelonGraph re-scored
  17. 2026-11-09 18:45 UTCGHSA enrichmentGHSA-6g2f-6p9p-vvm8 · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-11-09 18:27 UTCEchelonGraph re-scored
  19. 2026-11-09 18:00 UTCENISA EUVD ID recordedEUVD-2026-120125 · Source: ENISA EUVD
  20. 2026-11-09 17:35 UTCEchelonGraph re-scoredFirst assessed: 9.8 CRITICAL
  21. 2026-11-09 17:34 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-119756?
CVE-2026-119756 is a critical-severity vulnerability; its CVE record was published on November 9, 2026. Tasmota through 16.0.0, fixed in commit e97e1e4, contains a heap out-of-bounds write vulnerability in SendReceiveDeviceGroupMessage() that allows unauthenticated attackers on the local network to corrupt heap memory by sending crafted Device Groups messages over UDP port 4447 that cause the…
When was CVE-2026-119756 made public?
CVE-2026-119756 was made public on November 6, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on November 9, 2026. EchelonGraph's copy of the record carries a last-modified date of November 12, 2026; the record at its source may have been updated since.
Is CVE-2026-119756 actively exploited?
CVE-2026-119756 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-119756?
CVE-2026-119756 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-119756?
An upstream fix for CVE-2026-119756 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-119756 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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