CVE-2026-57826

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

An issue was discovered in openHiTLS 0.2.0 through 0.3.2. In the X.509 certificate chain verification, the basic constraints extension and CA flag processing of intermediate CAs are only verified for v3 certificates, and v1/v2 certificates are ignored.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 19, 2026

Advisory Details (6)

Auto-updated Aug 19, 2026
Patch available. Sources: github_commit.
generic

HTLS-2026-001

https://www.openhitls.net/zh/support/HTLS-2026-001.html
generic

Comparing openhitls-0.3.2...openhitls-0.3.3 · openHiTLS/openHiTLS · GitHub

https://github.com/openHiTLS/openHiTLS/compare/openhitls-0.3.2...openhitls-0.3.3
github_commit Patch Available

commit 4355cdf5b043 (openHiTLS/openHiTLS)

Patch available: openHiTLS/openHiTLS openhitls-0.3.3 (contains commit 4355cdf5b043)

https://github.com/openHiTLS/openHiTLS/commit/4355cdf5b043d5b9ef698f8f57860f77f8e92561
github_commit

commit 2d3b221d113b (openHiTLS/openHiTLS)

Fix landed in openHiTLS/openHiTLS commit 2d3b221d113b — awaiting tagged release

https://github.com/openHiTLS/openHiTLS/commit/2d3b221d113b452bc197012b185978b8314ee8a4
generic

AtomGit - 全球开发者的开源社区,开源代码托管平台

https://gitcode.com/openHiTLS/openhitls/pull/1657
generic

AtomGit - 全球开发者的开源社区,开源代码托管平台

https://gitcode.com/openHiTLS/openhitls/pull/1399

Vendor Advisories for CVE-2026-57826(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 20× in last 7d / 20× 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. 2026-08-21 05:39 UTCGHSA enrichment
  2. 2026-08-21 01:21 UTCEG score recompute
  3. 2026-08-21 01:21 UTCGHSA enrichment
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-20 21:04 UTCGHSA enrichment
  6. 2026-08-20 16:47 UTCGHSA enrichment
  7. 2026-08-20 12:30 UTCGHSA enrichment
  8. 2026-08-20 08:13 UTCGHSA enrichment
  9. 2026-08-20 03:56 UTCGHSA enrichment
  10. 2026-08-19 23:39 UTCEG score recompute
  11. 2026-08-19 23:39 UTCGHSA enrichment
  12. 2026-08-19 19:21 UTCGHSA enrichment
  13. 2026-08-19 18:38 UTCEG score recompute▲ 9.80
  14. 2026-08-19 18:38 UTCGHSA enrichment
  15. 2026-08-19 18:37 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  16. 2026-08-19 17:04 UTCEPSS rescore
  17. 2026-08-18 21:36 UTCGHSA enrichment
  18. 2026-08-18 20:22 UTCNVD update
  19. 2026-08-18 20:10 UTCEG score recompute
  20. 2026-08-18 20:08 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-57826?
CVE-2026-57826 is a critical vulnerability published on August 18, 2026. An issue was discovered in openHiTLS 0.2.0 through 0.3.2. In the X.509 certificate chain verification, the basic constraints extension and CA flag processing of intermediate CAs are only verified for v3 certificates, and v1/v2 certificates are ignored.
When was CVE-2026-57826 disclosed?
CVE-2026-57826 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57826 actively exploited?
CVE-2026-57826 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 76.4% of all scored CVEs.
What is the CVSS score of CVE-2026-57826?
CVE-2026-57826 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-57826?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57826, 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

Explore the affected products and dependency analysis for CVE-2026-57826

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