CVE-2026-86514

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-09-08. A secondary CVSS source baseline 6.3; sources differ by 0.0.

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

Also known asEUVD-2026-72615 (ENISA EUVD) · GHSA-4679-29mh-67pg (GitHub Security Advisories)Source: ENISA EUVD

6.3EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.3Exploit: No code on recordExposed services: Not assessed

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

A weakness has been identified in vgmstream up to r2117. This issue affects the function sscanf of the file src/meta/txth.c of the component txth-txtp. This manipulation causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Patch name: 4669d37a6af94866f6f0628678f9f90d46954e8b. To fix this issue, it is recommended to deploy a patch.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium 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)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (CISA Vulnrichment) · Automatable yes (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: 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
40th
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 (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-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 2026-10-24). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 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 public PoC (CISA Vulnrichment) · Automatable yes (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)14 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 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

September 8, 2026

Last Modified

September 28, 2026

Advisory Details (4)

Auto-updated Sep 8, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
Web page

GitHub - vgmstream/vgmstream: vgmstream - A library for playback of various streamed audio formats used in video games. · GitHub

https://github.com/vgmstream/vgmstream/
GitHub commit

commit 4669d37a6af9 (vgmstream/vgmstream)

Fix landed in vgmstream/vgmstream commit 4669d37a6af9 — awaiting tagged release

https://github.com/vgmstream/vgmstream/commit/4669d37a6af94866f6f0628678f9f90d46954e8b
GitHub pull request

misc

Fix merged in vgmstream/vgmstream PR #1956 on 2026-07-11 — awaiting tagged release

https://github.com/vgmstream/vgmstream/pull/1956
Web page

Stack buffer overflow in TXTH and TXTP text parsing · Issue #1972 · vgmstream/vgmstream · GitHub

https://github.com/vgmstream/vgmstream/issues/1972

Vendor Advisories for CVE-2026-86514(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 37× 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 136 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 36 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-29 23:25 UTCOSV refresh
  14. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  18. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-25 13:54 UTCEG score recompute
  20. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-22 12:45 UTCEG score recompute
  24. 2026-10-22 12:45 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  25. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 75 more
  1. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-18 03:04 UTCEG score recompute
  5. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  6. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-10-12 14:51 UTCEG score recompute
  12. 2026-10-11 23:24 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  13. 2026-10-11 19:17 UTCEG score recompute
  14. 2026-10-11 16:33 UTCEG score recompute
  15. 2026-10-11 13:50 UTCEG score recompute
  16. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-10-10 00:04 UTCEG score recompute
  19. 2026-10-10 00:04 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-10-09 00:46 UTCEG score recompute
  22. 2026-10-09 00:46 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  23. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  25. 2026-10-07 23:04 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  26. 2026-10-06 23:47 UTCEG score recompute
  27. 2026-10-06 23:47 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  28. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  29. 2026-10-06 00:30 UTCEG score recompute
  30. 2026-10-06 00:30 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  31. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  32. 2026-10-05 01:12 UTCEG score recompute
  33. 2026-10-05 01:12 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  34. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-10-04 00:49 UTCEG score recompute
  36. 2026-10-04 00:49 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  37. 2026-10-03 00:29 UTCEG score recompute
  38. 2026-10-03 00:29 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  39. 2026-10-02 01:11 UTCEG score recompute
  40. 2026-10-02 01:11 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  41. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  42. 2026-10-01 01:43 UTCEG score recompute
  43. 2026-10-01 01:43 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  44. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  45. 2026-09-30 02:26 UTCEG score recompute
  46. 2026-09-30 02:26 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  47. 2026-09-28 23:15 UTCEG score recompute
  48. 2026-09-28 23:15 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  49. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  50. 2026-09-28 13:47 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  51. 2026-09-27 14:30 UTCEG score recompute
  52. 2026-09-27 14:29 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  53. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  54. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  55. 2026-09-26 15:12 UTCEG score recompute
  56. 2026-09-26 15:12 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  57. 2026-09-25 15:10 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  58. 2026-09-24 15:53 UTCEG score recompute
  59. 2026-09-24 15:53 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  60. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  61. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  62. 2026-09-23 16:35 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  63. 2026-09-22 17:17 UTCEG score recompute
  64. 2026-09-22 17:17 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  65. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  66. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  67. 2026-09-21 17:37 UTCEG score recompute
  68. 2026-09-21 17:37 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  69. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  70. 2026-09-20 18:12 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  71. 2026-09-19 18:55 UTCEG score recompute
  72. 2026-09-19 18:55 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  73. 2026-09-18 19:38 UTCEG score recompute
  74. 2026-09-18 19:38 UTCGHSA enrichmentGHSA-4679-29mh-67pg · GitHub severity LOW · GitHub CVSS 6.3
  75. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 19th percentile

Frequently asked(5)

What is CVE-2026-86514?
CVE-2026-86514 is a medium-severity vulnerability; its CVE record was published on September 8, 2026. A weakness has been identified in vgmstream up to r2117. This issue affects the function sscanf of the file src/meta/txth.c of the component txth-txtp. This manipulation causes stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit has been made available to the…
When was the CVE record for CVE-2026-86514 published?
The CVE record for CVE-2026-86514 was published on September 8, 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 September 28, 2026; the record at its source may have been updated since.
Is CVE-2026-86514 actively exploited?
CVE-2026-86514 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-86514?
CVE-2026-86514 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-86514?
An upstream fix for CVE-2026-86514 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-2026-86514 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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