CVE-2026-90784

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory (severity: MODERATE) published 2026-09-14. A secondary CVSS source baseline 5.3; sources differ by 0.0.

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

Also known asEUVD-2026-77466 (ENISA EUVD) · GHSA-7xqv-gc79-6hf3 (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
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: 0.7%CVSS: 5.3Exploit: 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 vulnerability has been found in Dvidelabs flatcc up to 0.6.3. The impacted element is the function fb_clear_parser of the file src/Compiler/semantics.c. The manipulation leads to memory leak. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The identifier of the patch is 8dbc3419738da066151991fd2bf1d0c85591dea2. It is suggested to install a patch to address this issue.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100

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)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 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
0.7%
EPSS %ILE
54th
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 (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). 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 14, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
Web page

GitHub - dvidelabs/flatcc: FlatBuffers Compiler and Library in C for C · GitHub

https://github.com/dvidelabs/flatcc/
GitHub commit

commit 8dbc3419738d (dvidelabs/flatcc)

Fix landed in dvidelabs/flatcc commit 8dbc3419738d — awaiting tagged release

https://github.com/dvidelabs/flatcc/commit/8dbc3419738da066151991fd2bf1d0c85591dea2
Web page

[Bug]per-parse ~1KB heap leak: fb_clear_parser() never frees the reserved-keyword hash table (CWE-401) · Issue #389 · dvidelabs/flatcc · GitHub

https://github.com/dvidelabs/flatcc/issues/389

Vendor Advisories for CVE-2026-90784(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 9× in last 7d / 33× 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.

Showing the most recent 100 of 125 rows on record for this CVE, as 99 entries (1 repeat merged).

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. 1 repeat row among the latest 100 is merged into the row it repeats. The 25 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  2. 2026-11-12 11:03 UTCEchelonGraph re-scored
  3. 2026-11-12 11:03 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub severity MODERATE · GitHub CVSS 5.3
  4. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  5. 2026-11-10 16:46 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  6. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  7. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  8. 2026-11-07 19:10 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub severity MODERATE · GitHub CVSS 5.3
  9. 2026-11-07 19:10 UTCEchelonGraph re-scored
  10. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  11. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  12. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  13. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  14. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  15. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  16. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  17. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.7% · 54th percentile
  18. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  19. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  20. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  21. 2026-10-27 13:25 UTCOSV refresh
  22. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  23. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  24. 2026-10-25 13:51 UTCEchelonGraph re-scored
  25. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
Show 74 more
  1. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  2. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  3. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  4. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  5. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  6. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  7. 2026-10-18 03:00 UTCEchelonGraph re-scored
  8. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  9. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  10. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.7% · 53rd percentile
  11. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  12. 2026-10-14 15:38 UTCEchelonGraph re-scored
  13. 2026-10-14 15:38 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  14. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  15. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  16. 2026-10-12 16:13 UTCEchelonGraph re-scored
  17. 2026-10-12 16:13 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  18. 2026-10-12 14:46 UTCEchelonGraph re-scored
  19. 2026-10-11 19:45 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  20. 2026-10-11 19:14 UTCEchelonGraph re-scored
  21. 2026-10-11 16:30 UTCEchelonGraph re-scored
  22. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  23. 2026-10-11 13:45 UTCEchelonGraph re-scored
  24. 2026-10-10 20:28 UTCEchelonGraph re-scored
  25. 2026-10-10 20:28 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  26. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  27. 2026-10-09 21:40 UTCEchelonGraph re-scored
  28. 2026-10-09 21:40 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  29. 2026-10-09 20:08 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  30. 2026-10-08 22:57 UTCEchelonGraph re-scored
  31. 2026-10-08 22:57 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  32. 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  33. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  34. 2026-10-07 19:12 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  35. 2026-10-06 18:41 UTCEchelonGraph re-scored
  36. 2026-10-06 18:41 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  37. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  38. 2026-10-05 19:58 UTCEchelonGraph re-scored
  39. 2026-10-05 19:58 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  40. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  41. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  42. 2026-10-04 21:16 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  43. 2026-10-03 22:33 UTCEchelonGraph re-scored
  44. 2026-10-03 22:33 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  45. 2026-10-02 23:43 UTCEchelonGraph re-scored
  46. 2026-10-02 23:43 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  47. 2026-10-02 00:21 UTCEchelonGraph re-scored
  48. 2026-10-02 00:21 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  49. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  50. 2026-10-01 01:38 UTCEchelonGraph re-scored
  51. 2026-10-01 01:38 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  52. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  53. 2026-09-30 02:55 UTCEchelonGraph re-scored
  54. 2026-09-30 02:55 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  55. 2026-09-29 04:13 UTCEchelonGraph re-scored
  56. 2026-09-29 04:13 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  57. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  58. 2026-09-28 05:30 UTCEchelonGraph re-scored
  59. 2026-09-28 05:30 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  60. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  61. 2026-09-27 06:48 UTCEchelonGraph re-scored
  62. 2026-09-27 06:48 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  63. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  64. 2026-09-26 08:04 UTCEchelonGraph re-scored
  65. 2026-09-26 08:04 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  66. 2026-09-25 09:21 UTCEchelonGraph re-scored
  67. 2026-09-25 09:21 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  68. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.7% · 52nd percentile
  69. 2026-09-24 10:38 UTCEchelonGraph re-scored
  70. 2026-09-24 10:38 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  71. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  72. 2026-09-23 11:51 UTCEchelonGraph re-scored
  73. 2026-09-23 11:51 UTCGHSA enrichmentGHSA-7xqv-gc79-6hf3 · GitHub CVSS 5.3
  74. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile

Frequently asked(5)

What is CVE-2026-90784?
CVE-2026-90784 is a medium-severity vulnerability; its CVE record was published on September 14, 2026. A vulnerability has been found in Dvidelabs flatcc up to 0.6.3. The impacted element is the function fb_clear_parser of the file src/Compiler/semantics.c. The manipulation leads to memory leak. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be…
When was the CVE record for CVE-2026-90784 published?
The CVE record for CVE-2026-90784 was published on September 14, 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 14, 2026; the record at its source may have been updated since.
Is CVE-2026-90784 actively exploited?
CVE-2026-90784 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-90784?
CVE-2026-90784 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-90784?
An upstream fix for CVE-2026-90784 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-2026-90784 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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