CVE-2026-2016

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 82% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been disclosed publicly and may be used. The identifier of the patch is 82f66af3e252e3e137dba0c3891570f085e79adf. Applying a patch is the recommended action to fix this issue.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

February 6, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 2, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

[Bug Report] src/base64.c 中 base64_decode 函数存在堆缓冲区溢出漏洞 (Heap Buffer Overflow) · Issue #55 · happyfish100/libfastcommon · GitHub

https://github.com/happyfish100/libfastcommon/issues/55#issuecomment-3776757848
generic

[Bug Report] src/base64.c 中 base64_decode 函数存在堆缓冲区溢出漏洞 (Heap Buffer Overflow) · Issue #55 · happyfish100/libfastcommon · GitHub

https://github.com/happyfish100/libfastcommon/issues/55#issue-3836362577
generic

[Bug Report] src/base64.c 中 base64_decode 函数存在堆缓冲区溢出漏洞 (Heap Buffer Overflow) · Issue #55 · happyfish100/libfastcommon · GitHub

https://github.com/happyfish100/libfastcommon/issues/55
github_commit

commit 82f66af3e252 (happyfish100/libfastcommon)

Fix landed in happyfish100/libfastcommon commit 82f66af3e252 — awaiting tagged release

https://github.com/happyfish100/libfastcommon/commit/82f66af3e252e3e137dba0c3891570f085e79adf
generic

GitHub - happyfish100/libfastcommon: c common functions library extracted from my open source project FastDFS. this library is very simple and stable. functions including: string, logger, chain, hash, socket, ini file reader, base64 encode / decode, url encode / decode, fast timer, skiplist, object pool etc. detail info please see the c header files. · GitHub

https://github.com/happyfish100/libfastcommon/

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 29× 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.

Showing the most recent 100 of 195 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
  3. 2026-09-19 16:03 UTCOSV refresh
  4. 2026-09-18 19:28 UTCEPSS rescore
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  1. 2026-08-27 14:25 UTCEPSS rescore
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  15. 2026-08-14 22:52 UTCGHSA enrichment
  16. 2026-08-14 11:00 UTCEG score recompute
  17. 2026-08-14 11:00 UTCGHSA enrichment
  18. 2026-08-13 22:00 UTCEPSS rescore
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  20. 2026-08-13 03:20 UTCGHSA enrichment
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  24. 2026-08-10 03:12 UTCGHSA enrichment
  25. 2026-08-09 15:41 UTCEG score recompute
  26. 2026-08-09 15:41 UTCGHSA enrichment
  27. 2026-08-09 13:46 UTCEPSS rescore
  28. 2026-08-08 16:37 UTCEPSS rescore
  29. 2026-08-08 09:53 UTCGHSA enrichment
  30. 2026-08-07 22:39 UTCEG score recompute
  31. 2026-08-07 22:39 UTCGHSA enrichment
  32. 2026-08-06 13:46 UTCEPSS rescore
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  34. 2026-08-06 04:17 UTCGHSA enrichment
  35. 2026-08-05 19:17 UTCEPSS rescore
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  38. 2026-08-02 21:16 UTCEG score recompute▲ 2.50
  39. 2026-08-02 21:16 UTCGHSA enrichment
  40. 2026-08-02 02:26 UTCEPSS rescore
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  64. 2026-07-17 18:59 UTCOSV refresh
  65. 2026-07-16 17:03 UTCEPSS rescore
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  67. 2026-07-15 16:57 UTCEPSS rescore
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  74. 2026-07-12 05:46 UTCEPSS rescore
  75. 2026-07-11 08:27 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-2016?
CVE-2026-2016 is a high vulnerability published on February 6, 2026. A security vulnerability has been detected in happyfish100 libfastcommon up to 1.0.84. Affected by this vulnerability is the function base64_decode of the file src/base64.c. The manipulation leads to stack-based buffer overflow. Local access is required to approach this attack. The exploit has been…
When was CVE-2026-2016 disclosed?
CVE-2026-2016 was first published in the National Vulnerability Database on February 6, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2016 actively exploited?
CVE-2026-2016 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 80.7% of all scored CVEs.
What is the CVSS score of CVE-2026-2016?
CVE-2026-2016 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-2016?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2016, 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.

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