Vulnerability-Lookup

CVE-2026-72925 (GCVE-0-2026-72925)

Vulnerability from cvelistv5 – Published: 2026-08-11 14:45 – Updated: 2026-08-11 18:26

Title

SWC HTML minifier may allow script element breakout when minifying embedded JSON

Summary

SWC is a TypeScript / JavaScript compiler written in Rust. Prior to @swc/html 1.15.47-nightly-20260729.1 and swc_html_minifier 59.0.0, the minifyJson processing in crates/swc_html_minifier/src/lib.rs parsed and serialized attacker-controlled JSON in application/json and application/ld+json script elements without the escape_json_for_html_script behavior to re-escape less-than signs, allowing a closing script sequence to terminate the element early and execute script in the generated page's origin. This issue is fixed in @swc/html 1.15.47-nightly-20260729.1 and swc_html_minifier 59.0.0.

Severity

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-11 18:26 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116 - Improper Encoding or Escaping of Output

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7610 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/swc-project/swc/security/advis…	x_refsource_CONFIRM
https://github.com/swc-project/swc/pull/12080	x_refsource_MISC
https://github.com/swc-project/swc/commit/e1877b4…	x_refsource_MISC
https://github.com/swc-project/swc/releases/tag/v…	x_refsource_MISC
https://github.com/swc-project/swc/releases/tag/v…	x_refsource_MISC

Impacted products

3 products

Vendor	Product	Version	CPE status
swc-project	swc	Affected: < 1.15.47	guessed
@swc	html	Affected: < 1.15.47-nightly-20260729.1	guessed
swc-project	swc_html_minifier	Affected: < 59.0.0	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-72925

Vulnerability from fkie_nvd - Published: 2026-08-11 15:17 - Updated: 2026-09-18 20:05

Severity

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/swc-project/swc/commit/e1877b44bdac8abc9fd51e984d584f40f6999832
	security-advisories@github.com	https://github.com/swc-project/swc/pull/12080
	security-advisories@github.com	https://github.com/swc-project/swc/releases/tag/v1.15.47
	security-advisories@github.com	https://github.com/swc-project/swc/releases/tag/v1.15.47-nightly-20260729.1
	security-advisories@github.com	https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "swc",
          "vendor": "swc-project",
          "versions": [
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              "status": "affected",
              "version": "\u003c 1.15.47"
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        },
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              "version": "\u003c 1.15.47-nightly-20260729.1"
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          "product": "swc_html_minifier",
          "vendor": "swc-project",
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            }
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  ],
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    }
  ],
  "id": "CVE-2026-72925",
  "lastModified": "2026-09-18T20:05:53.723",
  "metrics": {
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      {
        "cvssData": {
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          "attackVector": "NETWORK",
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          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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    "ssvcV203": [
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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        },
        {
          "lang": "en",
          "value": "CWE-116"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-5QR2-V392-M9G8

Vulnerability from github – Published: 2026-09-08 17:58 – Updated: 2026-09-08 17:58

Summary

SWC HTML minifier may allow script element breakout when minifying embedded JSON

Details

Impact

@swc/html minifies JSON contained in script elements such as application/json and application/ld+json by parsing and serializing the JSON value.

Before the patched versions, JSON serialization could convert escaped less-than signs such as \u003C into literal < characters. If the JSON contained an escaped </script> sequence, the generated HTML could terminate the containing script element early because HTML tokenization occurs before the JSON is consumed.

Applications that minify HTML containing attacker-controlled JSON data could therefore transform inert data into active markup. A crafted payload could execute script in the origin of the generated page.

Patches

The issue is fixed in:

@swc/html 1.15.47
swc_html_minifier 59.0.0

The minifier now re-escapes less-than signs after JSON serialization, preserving the script element boundary.

Workarounds

Users who cannot upgrade can disable JSON minification with:

```js await minify(html, { minifyJson: false, });

Severity

6.1 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@swc/html"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.15.47-nightly-20260729.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "swc_html_minifier"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "59.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72925"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-116",
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T17:58:00Z",
    "nvd_published_at": "2026-08-11T15:17:38Z",
    "severity": "MODERATE"
  },
  "details": "## Impact\n\n`@swc/html` minifies JSON contained in `script` elements such as\n`application/json` and `application/ld+json` by parsing and serializing the\nJSON value.\n\nBefore the patched versions, JSON serialization could convert escaped\nless-than signs such as `\\u003C` into literal `\u003c` characters. If the JSON\ncontained an escaped `\u003c/script\u003e` sequence, the generated HTML could terminate\nthe containing script element early because HTML tokenization occurs before\nthe JSON is consumed.\n\nApplications that minify HTML containing attacker-controlled JSON data could\ntherefore transform inert data into active markup. A crafted payload could\nexecute script in the origin of the generated page.\n\n## Patches\n\nThe issue is fixed in:\n\n- `@swc/html` 1.15.47\n- `swc_html_minifier` 59.0.0\n\nThe minifier now re-escapes less-than signs after JSON serialization, preserving\nthe script element boundary.\n\n## Workarounds\n\nUsers who cannot upgrade can disable JSON minification with:\n\n```js\nawait minify(html, {\n  minifyJson: false,\n});",
  "id": "GHSA-5qr2-v392-m9g8",
  "modified": "2026-09-08T17:58:00Z",
  "published": "2026-09-08T17:58:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72925"
    },
    {
      "type": "WEB",
      "url": "https://github.com/swc-project/swc/pull/12080"
    },
    {
      "type": "WEB",
      "url": "https://github.com/swc-project/swc/commit/e1877b44bdac8abc9fd51e984d584f40f6999832"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/swc-project/swc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/swc-project/swc/releases/tag/v1.15.47"
    },
    {
      "type": "WEB",
      "url": "https://github.com/swc-project/swc/releases/tag/v1.15.47-nightly-20260729.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SWC HTML minifier may allow script element breakout when minifying embedded JSON"
}

Sightings

Author	Source	Type	Date	Other

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-72925 (GCVE-0-2026-72925)

FKIE_CVE-2026-72925

GHSA-5QR2-V392-M9G8

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