CVE-2026-41210

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd 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

Also known asEUVD-2026-97966 (ENISA EUVD)Source: ENISA EUVD

6.5EG
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: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Moonlight Qt is a GameStream client for Windows, macOS, Linux, and Steam Link. In version 6.1.0 and earlier, after a victim initiates a streaming session to a malicious host, the host can send a crafted H.264 SPS NAL when Moonlight selects a decoder path that does not advertise CAPABILITY_REFERENCE_FRAME_INVALIDATION_AVC. The SPS fixup path in app/streaming/video/ffmpeg.cpp parses the server-provided data with h264bitstream, where attacker-controlled seq_parameter_set_id is used to index the 32-entry sps_table without validation. A value of 32 or greater causes an out-of-bounds write and remote heap corruption in the Moonlight client. The demonstrated impact is a reliable client crash, while code execution is not established. This issue is fixed in version 6.2.0.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100

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)
Severity65% × 45%
Impact severity (EG Severity): CVSS 6.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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
0.3%
EPSS %ILE
23rd
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 (6.5): severity, escalated by confirmed exploitation. This CVE's 6.5 is its impact severity (EG Severity), not escalated.

EG Severity
6.5 MEDIUMCVSS-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
0.3% 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 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 (4)

Auto-updated Oct 12, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Remote heap buffer overflow in Moonlight Qt H.264 SPS fixup path via crafted seq_parameter_set_id · Advisory · moonlight-stream/moonlight-qt · GitHub

https://github.com/moonlight-stream/moonlight-qt/security/advisories/GHSA-5rvh-v25g-vrgv
GitHub release Patch Available

Moonlight PC v6.2.0

Patch available: moonlight-stream/moonlight-qt v6.2.0

https://github.com/moonlight-stream/moonlight-qt/releases/tag/v6.2.0
GitHub commit

commit b7adc70ea474 (moonlight-stream/moonlight-qt)

Fix landed in moonlight-stream/moonlight-qt commit b7adc70ea474 — awaiting tagged release

https://github.com/moonlight-stream/moonlight-qt/commit/b7adc70ea474f7448c6185081ad9fc87b0b47cf0
GitHub commit

commit 3e24a7a1a536 (moonlight-stream/moonlight-qt)

Fix landed in moonlight-stream/moonlight-qt commit 3e24a7a1a536 — awaiting tagged release

https://github.com/moonlight-stream/moonlight-qt/commit/3e24a7a1a5369163482ce5a76d5232536e03c53f

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 30× 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. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  3. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-10-28 02:25 UTCOSV refresh
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-25 14:30 UTCEG score recompute
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-10-18 03:42 UTCEG score recompute
  20. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-10-16 20:11 UTCEG score recompute
  22. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  25. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
Show 5 more
  1. 2026-10-13 16:29 UTCEG score recompute
  2. 2026-10-13 15:22 UTCEG score recompute
  3. 2026-10-12 22:28 UTCEG score recompute
  4. 2026-10-12 21:30 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  5. 2026-10-12 21:29 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-41210?
CVE-2026-41210 is a medium-severity vulnerability; its CVE record was published on October 12, 2026. Moonlight Qt is a GameStream client for Windows, macOS, Linux, and Steam Link. In version 6.1.0 and earlier, after a victim initiates a streaming session to a malicious host, the host can send a crafted H.264 SPS NAL when Moonlight selects a decoder path that does not advertise…
When was the CVE record for CVE-2026-41210 published?
The CVE record for CVE-2026-41210 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-2026-41210 actively exploited?
CVE-2026-41210 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (23rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41210?
CVE-2026-41210 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-41210?
A fix for CVE-2026-41210 is available: update to the fixed version the vendor names in its advisory.

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