CVE-2026-82820

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory (severity: LOW) published 2026-08-31. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A vulnerability was found in FLVMeta up to 1.2.2. Affected is the function amf_string_new of the file src/amf.c of the component AMF String Processing. The manipulation of the argument length results in heap-based buffer overflow. The attack can be launched remotely. The exploit has been made public and could be used. The patch is identified as f412a33b9a84c2d1a9dee145a868feddbf64879e. A patch should be applied to remediate this issue. The project maintainer doubts the security impact: "While I acknowledged the bugs and provided fixes, I have yet to see any way to exploit these alleged vulnerabilities."

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
50(Attend)
EG Risk 50/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 1, 2026

Advisory Details (3)

Auto-updated Aug 31, 2026
🔬 Proof of concept available. Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit f412a33b9a84 (noirotm/flvmeta)

Fix landed in noirotm/flvmeta commit f412a33b9a84 — awaiting tagged release

https://github.com/noirotm/flvmeta/commit/f412a33b9a84c2d1a9dee145a868feddbf64879e
generic

Poc/flvmeta_heap_buffer_overflow at main · raind20001020/Poc · GitHub

https://github.com/raind20001020/Poc/blob/main/flvmeta_heap_buffer_overflow
generic🟡 PoC Available

Vuln:flvmeta heap-buffer-overflow · Issue #27 · noirotm/flvmeta · GitHub

https://github.com/noirotm/flvmeta/issues/27

Vendor Advisories for CVE-2026-82820(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
flvmeta1.2.1-1, 1.2.2-1, 1.2.2-2, 1.2.2-2~exp1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
flvmeta1.2.2-1, 1.2.2-2, 1.2.2-2~exp1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
flvmeta1.2.2-1, 1.2.2-2, 1.2.2-2~exp1——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 58× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 14:04 UTCEG score recompute
  3. 2026-09-20 14:04 UTCGHSA enrichment
  4. 2026-09-19 13:06 UTCEG score recompute
  5. 2026-09-19 13:06 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 12:08 UTCEG score recompute
  8. 2026-09-18 12:08 UTCGHSA enrichment
  9. 2026-09-17 11:09 UTCEG score recompute
  10. 2026-09-17 11:09 UTCGHSA enrichment
  11. 2026-09-16 14:08 UTCEPSS rescore
  12. 2026-09-16 10:11 UTCEG score recompute
  13. 2026-09-16 10:11 UTCGHSA enrichment
  14. 2026-09-16 05:15 UTCEPSS rescore
  15. 2026-09-15 09:12 UTCEG score recompute
  16. 2026-09-15 09:12 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 08:13 UTCEG score recompute
  20. 2026-09-14 08:13 UTCGHSA enrichment
  21. 2026-09-13 07:15 UTCEG score recompute
  22. 2026-09-13 07:15 UTCGHSA enrichment
  23. 2026-09-12 06:17 UTCEG score recompute
  24. 2026-09-12 06:16 UTCGHSA enrichment
  25. 2026-09-11 14:53 UTCEPSS rescore
Show 33 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 05:17 UTCEG score recompute
  3. 2026-09-11 05:17 UTCGHSA enrichment
  4. 2026-09-10 04:19 UTCGHSA enrichment
  5. 2026-09-09 03:20 UTCEG score recompute
  6. 2026-09-09 03:20 UTCGHSA enrichment
  7. 2026-09-08 22:01 UTCEPSS rescore
  8. 2026-09-08 02:22 UTCEG score recompute
  9. 2026-09-08 02:22 UTCGHSA enrichment
  10. 2026-09-07 01:24 UTCEG score recompute
  11. 2026-09-07 01:23 UTCGHSA enrichment
  12. 2026-09-06 13:48 UTCEPSS rescore
  13. 2026-09-06 00:26 UTCEG score recompute
  14. 2026-09-06 00:26 UTCGHSA enrichment
  15. 2026-09-05 15:31 UTCEPSS rescore
  16. 2026-09-04 23:28 UTCEG score recompute
  17. 2026-09-04 23:28 UTCGHSA enrichment
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-03 22:10 UTCGHSA enrichment
  20. 2026-09-02 20:33 UTCEG score recompute
  21. 2026-09-02 20:33 UTCGHSA enrichment
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 19:34 UTCEG score recompute
  24. 2026-09-01 19:34 UTCGHSA enrichment
  25. 2026-09-01 19:25 UTCNVD updateCVSS v4 → 2.1
  26. 2026-09-01 18:25 UTCEG score recompute
  27. 2026-09-01 18:25 UTCGHSA enrichment
  28. 2026-09-01 18:22 UTCMITRE cvelistV5CVSS v4 → 5.3
  29. 2026-09-01 13:54 UTCEPSS rescore
  30. 2026-08-31 19:28 UTCEG score recompute
  31. 2026-08-31 19:21 UTCNVD updateCVSS v4 → 2.1
  32. 2026-08-31 18:47 UTCEG score recompute
  33. 2026-08-31 18:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82820?
CVE-2026-82820 is a medium vulnerability published on August 31, 2026. A vulnerability was found in FLVMeta up to 1.2.2. Affected is the function amfstringnew of the file src/amf.c of the component AMF String Processing. The manipulation of the argument length results in heap-based buffer overflow. The attack can be launched remotely. The exploit has been made public…
When was CVE-2026-82820 disclosed?
CVE-2026-82820 was first published in the National Vulnerability Database on August 31, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82820 actively exploited?
CVE-2026-82820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 69.8% of all scored CVEs.
What is the CVSS score of CVE-2026-82820?
CVE-2026-82820 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-82820?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82820, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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