markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed. The default configuration (typographer: false) is not affected, but this option is enabled with high probability. This issue is fixed in versions 14.3.2 and 15.0.2.
CVE-2026-111759
HIGHPre-NVD 7.57.5Trending — 3 sources updated this weekElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC.EchelonGraph confidence 38%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreHIGH confidence
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-20. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Also known asEUVD-2026-104538 (ENISA EUVD) · GHSA-r7fv-28h4-cvq7 (GitHub Security Advisories)Source: ENISA EUVD
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.6%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHhigh confidence
- EG Risk
- 65EG Risk 65/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.6%
- EPSS %ILE
- 48th
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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.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).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
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.
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
October 19, 2026
Last Modified
October 19, 2026
Advisory Details (4)
Auto-updated Oct 19, 2026🔬 Proof of concept available. Patch available. Sources: github, github_commit.
GitHub commit
commit daf5a3c32303 (markdown-it/markdown-it)
Fix landed in markdown-it/markdown-it commit daf5a3c32303 — awaiting tagged release
https://github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725fb5990b8162GitHub commit
commit cf27366035ed (markdown-it/markdown-it)
Fix landed in markdown-it/markdown-it commit cf27366035ed — awaiting tagged release
https://github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d67b030a4152GitHub commit
commit 1b379c1b6d05 (markdown-it/markdown-it)
Fix landed in markdown-it/markdown-it commit 1b379c1b6d05 — awaiting tagged release
https://github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c79af2c8670GitHub advisoryMentions a patch (unverified)🟡 PoC Available
Quadratic complexity in smartquotes with unmatched closing quotes · Advisory · markdown-it/markdown-it · GitHub
https://github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7Vendor Advisories for CVE-2026-111759(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| npm | markdown-it @ 15.0.2 (fixes >= 15.0.0, < 15.0.2) | — | ghsa |
| npm | markdown-it @ 14.3.2 (fixes < 14.3.2) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| markdown-it | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 21× 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 it from the CNA feed. 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). Most recent first.
- 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-11-01 07:59 UTCGHSA enrichmentGHSA-r7fv-28h4-cvq7 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:59 UTCEG score recompute
- 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-27 18:46 UTCEG score recompute
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-25 14:52 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-19 19:30 UTCEG score recompute
- 2026-10-19 18:26 UTCEG score recompute
- 2026-10-19 17:48 UTCEG score recomputeFirst assessed: 7.5 HIGH
- 2026-10-19 17:47 UTCMITRE cvelistV5first tracked
Related CVEs(same product + same CWE)
Same product
6 shownnpm:markdown-it
Frequently asked(5)
What is CVE-2026-111759?
CVE-2026-111759 is a high-severity vulnerability; its CVE record was published on October 19, 2026. markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes…
When was the CVE record for CVE-2026-111759 published?
The CVE record for CVE-2026-111759 was published on October 19, 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 October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-111759 actively exploited?
CVE-2026-111759 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-111759?
CVE-2026-111759 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-111759?
A fix for CVE-2026-111759 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-111759 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-111759
Is Your Infrastructure Affected by CVE-2026-111759?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.