CVE-2026-124309

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreHIGH confidence

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

Score 6.1 from GitHub Security Advisory (severity: MODERATE) published 2026-11-07. A secondary CVSS source baseline 6.1; sources differ by 0.0.

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

Also known asEUVD-2026-119277 (ENISA EUVD) · GHSA-w892-xhp2-gg6x (GitHub Security Advisories)Source: ENISA EUVD

6.1EG
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: 0.1%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fraunhofer HHI VVdeC before 3.2.1 contains a heap out-of-bounds read vulnerability in SEIReader::xParseSEIScalableNesting that allows attackers to read past heap allocations by casting the SEI wrapper object instead of its payload. Attackers can supply a crafted VVC bitstream with a scalable nesting SEI containing a nested buffering period SEI to crash the decoder or copy adjacent heap memory.

CVSS v3
6.1
EG Score
6.1MEDIUMhigh 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)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 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
0.1%
EPSS %ILE
1st
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 (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% 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 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

November 7, 2026

Last Modified

November 12, 2026

Advisory Details (6)

Auto-updated Nov 7, 2026
Patch available. Sources: github_commit.
Web page

Fraunhofer HHI VVdeC before 3.2.1 Heap Out-of-Bounds Read via SEIReader::xParseSEIScalableNesting | Advisories | VulnCheck

https://www.vulncheck.com/advisories/fraunhofer-hhi-vvdec-before-3.2.1-heap-out-of-bounds-read-via-seireader-xparseseiscalablenesting
Web page

GitHub - fraunhoferhhi/vvdec: VVdeC, the Fraunhofer Versatile Video Decoder · GitHub

https://github.com/fraunhoferhhi/vvdec
Web page

vvdec/source/Lib/CommonLib/Slice.h at v3.2.0 · fraunhoferhhi/vvdec · GitHub

https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/CommonLib/Slice.h#L644
Web page

vvdec/source/Lib/DecoderLib/SEIread.cpp at v3.2.0 · fraunhoferhhi/vvdec · GitHub

https://github.com/fraunhoferhhi/vvdec/blob/v3.2.0/source/Lib/DecoderLib/SEIread.cpp#L586-L592
GitHub commit Patch Available

commit 1d657c7a8229 (fraunhoferhhi/vvdec)

Patch available: fraunhoferhhi/vvdec v3.2.1 (contains commit 1d657c7a8229)

https://github.com/fraunhoferhhi/vvdec/commit/1d657c7a822987d2ff935e9c227c5faf5318ca06
Web page

[security] CommonLib/Slice.h:644 Out-of-Bounds Read in vvdec::HRD::setBufferingPeriodSEI · Issue #397 · fraunhoferhhi/vvdec · GitHub

https://github.com/fraunhoferhhi/vvdec/issues/397

Vendor Advisories for CVE-2026-124309(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 14× in last 7d / 14× 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 0.1% · 1st percentile
  2. 2026-11-12 21:50 UTCEchelonGraph re-scored
  3. 2026-11-12 21:50 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  4. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-11-12 01:28 UTCEchelonGraph re-scored
  6. 2026-11-12 01:28 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  7. 2026-11-12 00:38 UTCEchelonGraph re-scored
  8. 2026-11-12 00:38 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  9. 2026-11-11 16:38 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  10. 2026-11-11 05:28 UTCEchelonGraph re-scored
  11. 2026-11-11 05:28 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  12. 2026-11-11 04:11 UTCEchelonGraph re-scored
  13. 2026-11-11 04:11 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  14. 2026-11-10 16:42 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  17. 2026-11-08 09:00 UTCEchelonGraph re-scored
  18. 2026-11-08 09:00 UTCGHSA enrichmentGHSA-w892-xhp2-gg6x · GitHub severity MODERATE · GitHub CVSS 6.1
  19. 2026-11-07 15:27 UTCEchelonGraph re-scored
  20. 2026-11-07 15:04 UTCENISA EUVD ID recordedEUVD-2026-119277 · Source: ENISA EUVD
  21. 2026-11-07 14:21 UTCEchelonGraph re-scoredFirst assessed: 6.1 MEDIUM
  22. 2026-11-07 14:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-124309?
CVE-2026-124309 is a medium-severity vulnerability; its CVE record was published on November 7, 2026. Fraunhofer HHI VVdeC before 3.2.1 contains a heap out-of-bounds read vulnerability in SEIReader::xParseSEIScalableNesting that allows attackers to read past heap allocations by casting the SEI wrapper object instead of its payload. Attackers can supply a crafted VVC bitstream with a scalable…
When was CVE-2026-124309 made public?
CVE-2026-124309 was made public on September 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 7, 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-2026-124309 actively exploited?
CVE-2026-124309 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-124309?
CVE-2026-124309 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-124309?
A fix for CVE-2026-124309 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-124309 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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