CVE-2026-57436

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 77% 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, nvd
Trending — 3 sources updated this week
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
23.1%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 27, 2026
Patch available. Sources: github.
github Patch Available

Possible Use-After-Free when setting `Document#root=` to an invalid node type · Advisory · sparklemotion/nokogiri · GitHub

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wjv4-x9w8-wm3h

Vendor Advisories for CVE-2026-57436(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 25× in last 7d / 34× 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. 2026-07-07 02:34 UTCEG score recompute
  2. 2026-07-07 02:34 UTCVendor advisory
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 03:50 UTCEG score recompute
  6. 2026-07-06 03:50 UTCVendor advisory
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 05:06 UTCEG score recompute
  10. 2026-07-05 05:06 UTCVendor advisory
  11. 2026-07-05 02:31 UTCEPSS rescore
  12. 2026-07-05 02:30 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 06:19 UTCEG score recompute
  16. 2026-07-04 06:19 UTCVendor advisory
  17. 2026-07-03 07:33 UTCEG score recompute
  18. 2026-07-03 07:33 UTCVendor advisory
  19. 2026-07-02 08:49 UTCEG score recompute
  20. 2026-07-02 08:49 UTCVendor advisory
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-07-01 10:04 UTCEG score recompute
  23. 2026-07-01 10:04 UTCVendor advisory
  24. 2026-06-30 23:22 UTCEPSS rescore
  25. 2026-06-30 11:19 UTCEG score recompute
Show 9 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 12:25 UTCEG score recompute
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 13:41 UTCEG score recompute▲ 3.60
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-27 03:08 UTCEPSS rescore
  7. 2026-06-26 17:41 UTCNVD updateCVSS v3 → 5.3 · severity → MEDIUM
  8. 2026-06-25 15:48 UTCEG score recompute
  9. 2026-06-25 15:47 UTCNVD updatefirst tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-57436?
CVE-2026-57436 is a medium vulnerability published on June 25, 2026. Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage…
When was CVE-2026-57436 disclosed?
CVE-2026-57436 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57436 actively exploited?
CVE-2026-57436 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-57436?
CVE-2026-57436 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-57436?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57436, 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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