CVE-2026-86303

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory published 2026-09-07. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

A vulnerability was determined in 92181 markdown up to 058cab0cb7fb245a0ccc6b8446963ff8d573558f. Affected by this issue is the function lds of the file md.c. Executing a manipulation can lead to out-of-bounds read. The attack can be executed remotely. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. This patch is called c000d2f9cf390c315378d3717cf20911cf3e80a6. A patch should be applied to remediate this issue.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
64(Attend)
EG Risk 64/100SSVC: 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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 8, 2026

Advisory Details (4)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
generic

GitHub - 92181/markdown: Extremely performant markdown parser, written in ANSI C. · GitHub

https://github.com/92181/markdown/
github_commit

commit c000d2f9cf39 (92181/markdown)

Fix landed in 92181/markdown commit c000d2f9cf39 — awaiting tagged release

https://github.com/92181/markdown/commit/c000d2f9cf390c315378d3717cf20911cf3e80a6
github_pr

Fix OOB read in lds() at end of exact-length input

Fix merged in 92181/markdown PR #2 on 2026-07-18 — awaiting tagged release

https://github.com/92181/markdown/pull/2
generic

Out-of-bounds read in `lds()` when input ends with a newline · Issue #1 · 92181/markdown · GitHub

https://github.com/92181/markdown/issues/1

Vendor Advisories for CVE-2026-86303(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 26× in last 7d / 51× 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 07:08 UTCGHSA enrichment
  2. 2026-09-19 17:43 UTCEG score recompute
  3. 2026-09-19 17:43 UTCGHSA enrichment
  4. 2026-09-19 04:59 UTCEG score recompute
  5. 2026-09-19 04:59 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 16:14 UTCGHSA enrichment
  8. 2026-09-18 03:16 UTCEG score recompute
  9. 2026-09-18 03:16 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 14:32 UTCGHSA enrichment
  12. 2026-09-17 01:48 UTCEG score recompute
  13. 2026-09-17 01:48 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 13:03 UTCEG score recompute
  16. 2026-09-16 13:03 UTCGHSA enrichment
  17. 2026-09-16 05:15 UTCEPSS rescore
  18. 2026-09-16 00:18 UTCGHSA enrichment
  19. 2026-09-15 11:34 UTCEG score recompute
  20. 2026-09-15 11:34 UTCGHSA enrichment
  21. 2026-09-15 03:12 UTCEPSS rescore
  22. 2026-09-15 03:12 UTCEPSS rescore
  23. 2026-09-14 22:50 UTCGHSA enrichment
  24. 2026-09-14 10:05 UTCGHSA enrichment
  25. 2026-09-13 21:21 UTCEG score recompute
Show 26 more
  1. 2026-09-13 21:21 UTCGHSA enrichment
  2. 2026-09-13 08:37 UTCGHSA enrichment
  3. 2026-09-12 19:52 UTCEG score recompute
  4. 2026-09-12 19:52 UTCGHSA enrichment
  5. 2026-09-12 07:07 UTCGHSA enrichment
  6. 2026-09-11 18:23 UTCEG score recompute
  7. 2026-09-11 18:23 UTCGHSA enrichment
  8. 2026-09-11 14:53 UTCEPSS rescore
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 05:39 UTCGHSA enrichment
  11. 2026-09-10 16:52 UTCEG score recompute
  12. 2026-09-10 16:52 UTCGHSA enrichment
  13. 2026-09-10 04:08 UTCGHSA enrichment
  14. 2026-09-09 15:18 UTCGHSA enrichment
  15. 2026-09-09 02:33 UTCEG score recompute
  16. 2026-09-09 02:33 UTCGHSA enrichment
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-08 13:49 UTCEG score recompute
  19. 2026-09-08 13:49 UTCGHSA enrichment
  20. 2026-09-08 13:07 UTCEG score recompute
  21. 2026-09-08 13:06 UTCGHSA enrichment
  22. 2026-09-08 02:19 UTCEG score recompute
  23. 2026-09-08 02:19 UTCGHSA enrichment
  24. 2026-09-07 13:35 UTCEG score recompute
  25. 2026-09-07 12:29 UTCEG score recompute
  26. 2026-09-07 12:26 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-86303?
CVE-2026-86303 is a high vulnerability published on September 7, 2026. A vulnerability was determined in 92181 markdown up to 058cab0cb7fb245a0ccc6b8446963ff8d573558f. Affected by this issue is the function lds of the file md.c. Executing a manipulation can lead to out-of-bounds read. The attack can be executed remotely. This product implements a rolling release for…
When was CVE-2026-86303 disclosed?
CVE-2026-86303 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86303 actively exploited?
CVE-2026-86303 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 75.5% of all scored CVEs.
What is the CVSS score of CVE-2026-86303?
CVE-2026-86303 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-86303?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86303, 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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