CVE-2026-57436

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 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)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
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.

Affected Packages

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.11.1+dfsg-2 ... 1.19.4+dfsg-1 (33 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.13.10+dfsg-2 ... 1.19.4+dfsg-1 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.4+dfsg-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.3+dfsg-1 (6 versions)1.19.4+dfsg-1—
RubyGems(1)
PackageVulnerable rangeFixed inDependents
nokogiri1.0.0 ... 1.9.1 (194 versions)1.19.4—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 42× 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.

Showing the most recent 100 of 173 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 07:28 UTCEG score recompute
  3. 2026-09-18 07:28 UTCVendor advisory
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 03:11 UTCEPSS rescore
  8. 2026-09-14 01:21 UTCEG score recompute
  9. 2026-09-14 01:21 UTCVendor advisory
  10. 2026-09-13 16:47 UTCEPSS rescore
  11. 2026-09-12 15:51 UTCEG score recompute
  12. 2026-09-12 15:51 UTCVendor advisory
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-08 22:01 UTCEPSS rescore
  16. 2026-09-07 16:01 UTCEPSS rescore
  17. 2026-09-06 13:47 UTCEPSS rescore
  18. 2026-09-04 05:07 UTCEPSS rescore
  19. 2026-09-02 14:12 UTCEPSS rescore
  20. 2026-09-01 13:54 UTCEPSS rescore
  21. 2026-09-01 04:40 UTCEPSS rescore
  22. 2026-08-30 19:36 UTCEG score recompute
  23. 2026-08-30 19:36 UTCVendor advisory
  24. 2026-08-30 19:17 UTCEPSS rescore
  25. 2026-08-30 01:22 UTCEPSS rescore
Show 75 more
  1. 2026-08-28 21:42 UTCEPSS rescore
  2. 2026-08-27 23:56 UTCEG score recompute
  3. 2026-08-27 23:56 UTCVendor advisory
  4. 2026-08-27 14:25 UTCEPSS rescore
  5. 2026-08-26 14:46 UTCEPSS rescore
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 13:11 UTCEG score recompute
  8. 2026-08-24 13:11 UTCVendor advisory
  9. 2026-08-23 09:23 UTCEG score recompute
  10. 2026-08-23 09:23 UTCVendor advisory
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-22 10:38 UTCEG score recompute
  13. 2026-08-22 10:38 UTCVendor advisory
  14. 2026-08-21 23:49 UTCEPSS rescore
  15. 2026-08-21 05:49 UTCEG score recompute
  16. 2026-08-21 05:49 UTCVendor advisory
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-20 07:05 UTCEG score recompute
  19. 2026-08-20 07:05 UTCVendor advisory
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-19 01:29 UTCEG score recompute
  22. 2026-08-19 01:29 UTCVendor advisory
  23. 2026-08-18 13:48 UTCEPSS rescore
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-17 02:41 UTCEG score recompute
  26. 2026-08-17 02:41 UTCVendor advisory
  27. 2026-08-16 14:56 UTCEPSS rescore
  28. 2026-08-16 03:57 UTCEG score recompute
  29. 2026-08-16 03:57 UTCVendor advisory
  30. 2026-08-16 02:14 UTCEPSS rescore
  31. 2026-08-15 05:14 UTCEG score recompute
  32. 2026-08-15 05:14 UTCVendor advisory
  33. 2026-08-15 01:30 UTCEPSS rescore
  34. 2026-08-14 06:30 UTCEG score recompute
  35. 2026-08-14 06:30 UTCVendor advisory
  36. 2026-08-13 22:00 UTCEPSS rescore
  37. 2026-08-13 07:46 UTCEG score recompute
  38. 2026-08-13 07:46 UTCVendor advisory
  39. 2026-08-12 13:51 UTCEPSS rescore
  40. 2026-08-12 08:16 UTCEG score recompute
  41. 2026-08-12 08:16 UTCVendor advisory
  42. 2026-08-11 09:32 UTCEG score recompute
  43. 2026-08-11 09:32 UTCVendor advisory
  44. 2026-08-11 00:00 UTCEPSS rescore
  45. 2026-08-10 10:49 UTCEG score recompute
  46. 2026-08-09 13:46 UTCEPSS rescore
  47. 2026-08-09 12:05 UTCEG score recompute
  48. 2026-08-09 12:05 UTCVendor advisory
  49. 2026-08-08 16:37 UTCEPSS rescore
  50. 2026-08-08 13:21 UTCEG score recompute
  51. 2026-08-08 13:21 UTCVendor advisory
  52. 2026-08-07 14:37 UTCVendor advisory
  53. 2026-08-06 15:54 UTCEG score recompute
  54. 2026-08-06 15:54 UTCVendor advisory
  55. 2026-08-06 13:47 UTCEPSS rescore
  56. 2026-08-05 19:17 UTCEPSS rescore
  57. 2026-08-04 17:14 UTCEG score recompute
  58. 2026-08-04 17:14 UTCVendor advisory
  59. 2026-08-04 15:10 UTCEPSS rescore
  60. 2026-08-04 10:39 UTCEPSS rescore
  61. 2026-08-03 18:30 UTCEG score recompute
  62. 2026-08-03 18:30 UTCVendor advisory
  63. 2026-08-03 10:36 UTCEPSS rescore
  64. 2026-08-02 19:47 UTCEG score recompute
  65. 2026-08-02 19:47 UTCVendor advisory
  66. 2026-08-02 02:27 UTCEPSS rescore
  67. 2026-08-01 21:03 UTCEG score recompute
  68. 2026-08-01 21:03 UTCVendor advisory
  69. 2026-08-01 04:16 UTCEPSS rescore
  70. 2026-07-31 22:20 UTCVendor advisory
  71. 2026-07-30 23:35 UTCEG score recompute
  72. 2026-07-30 16:28 UTCEPSS rescore
  73. 2026-07-30 01:30 UTCEPSS rescore
  74. 2026-07-30 01:30 UTCEPSS rescore
  75. 2026-07-30 00:51 UTCVendor advisory

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 0% probability of exploitation in the next 30 days, which ranks it in the top 65.8% of all scored CVEs.
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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