linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs unanchored regex searches on progressively shorter tails. Any service that synchronously renders untrusted Markdown with linkify:true on a request hot path can inherit a worker-process denial of service triggerable by a tens-of-KB request body. This issue is fixed in version 5.0.1.
CVE-2026-48801
HIGHPre-NVD 8.78.7—Elevated
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 64% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.7Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 8.7
- EG Score
- 8.7(medium)
- EPSS
- 36.3%
- KEV
- Not listed
Published
June 26, 2026
Last Modified
July 15, 2026
Advisory Details (2)
Auto-updated Jul 14, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available
Quadratic algorithmic complexity in LinkifyIt#match scan loop · Advisory · markdown-it/linkify-it · GitHub
https://github.com/markdown-it/linkify-it/security/advisories/GHSA-22p9-wv53-3rq4github_commit
commit 6be6d15e0641 (markdown-it/linkify-it)
Fix landed in markdown-it/linkify-it commit 6be6d15e0641 — awaiting tagged release
https://github.com/markdown-it/linkify-it/commit/6be6d15e0641bf1daeaa977d500cabc743166159Vendor Advisories for CVE-2026-48801(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:42815Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.2 security update
- RHSA-2026:38187Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- GHSA-22p9-wv53-3rq4GitHub Security AdvisoriesHigh
LinkifyIt#match scan loop has quadratic algorithmic complexity
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | rust-main-1.97.0-1.1.hum1 | 2026-07-11 | redhat |
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.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 13× 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.
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-18 10:04 UTCEPSS rescore
- 2026-07-16 23:57 UTCVendor advisory
- 2026-07-16 17:03 UTCEPSS rescore
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-07-14 20:33 UTCEG score recompute▲ 8.70
- 2026-07-14 20:30 UTCMITRE cvelistV5CVSS v3 → 8.7 · CVSS v4 → 8.7
- 2026-06-26 21:41 UTCEG score recompute
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Same vendor
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Frequently asked(5)
What is CVE-2026-48801?
CVE-2026-48801 is a high vulnerability published on June 26, 2026. linkify-it is a links recognition library with full Unicode support. Prior to 5.0.1, LinkifyIt.prototype.match, the package's primary public API, has O(N²) algorithmic complexity for inputs containing many fuzzy links or emails because the JavaScript-level scan loop re-slices input and re-runs…
When was CVE-2026-48801 disclosed?
CVE-2026-48801 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48801 actively exploited?
CVE-2026-48801 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-48801?
CVE-2026-48801 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-48801?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48801, 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-2026-48801
Is Your Infrastructure Affected by CVE-2026-48801?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.