CVE-2026-9358 (GCVE-0-2026-9358)

Vulnerability from cvelistv5 – Published: 2026-05-24 05:30 – Updated: 2026-05-24 05:30
VLAI
Title
postcss AST Serialization container.js toString recursion
Summary
A vulnerability was determined in postcss up to 7.1.1. Affected is the function toString of the file src/selectors/container.js of the component AST Serialization. Executing a manipulation can lead to uncontrolled recursion. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor explains, that according to his definition "DoS on server-side on user-generated CSS is low risk for us (since most users compile own CSS with PostCSS)."
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C
4.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C
CWE
Assigner
References
URL Tags
https://vuldb.com/vuln/365321 vdb-entrytechnical-description
https://vuldb.com/vuln/365321/cti signaturepermissions-required
https://vuldb.com/submit/813080 third-party-advisory
https://gist.github.com/bx33661/581e3a38134601c04… exploit
Impacted products
Vendor Product Version
n/a postcss Affected: 7.1.0
Affected: 7.1.1
    cpe:2.3:a:postcss:postcss:*:*:*:*:*:*:*:*
Credits
bx33661 (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:postcss:postcss:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "AST Serialization"
          ],
          "product": "postcss",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "7.1.0"
            },
            {
              "status": "affected",
              "version": "7.1.1"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "bx33661 (VulDB User)"
        },
        {
          "lang": "en",
          "type": "coordinator",
          "value": "VulDB CNA Team"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was determined in postcss up to 7.1.1. Affected is the function toString of the file src/selectors/container.js of the component AST Serialization. Executing a manipulation can lead to uncontrolled recursion. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor explains, that according to his definition \"DoS on server-side on user-generated CSS is low risk for us (since most users compile own CSS with PostCSS).\""
        }
      ],
      "metrics": [
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      "providerMetadata": {
        "dateUpdated": "2026-05-24T05:30:09.671Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-365321 | postcss AST Serialization container.js toString recursion",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/365321"
        },
        {
          "name": "VDB-365321 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/365321/cti"
        },
        {
          "name": "Submit #813080 | postcss-selector-parser postcss \u003c= 7.1.1  CWE-674: Uncontrolled Recursion",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/813080"
        },
        {
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          "url": "https://gist.github.com/bx33661/581e3a38134601c04e19b4dfc9b459b9"
        }
      ],
      "timeline": [
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          "lang": "en",
          "time": "2026-05-23T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-05-23T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-05-23T11:54:49.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "postcss AST Serialization container.js toString recursion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-9358",
    "datePublished": "2026-05-24T05:30:09.671Z",
    "dateReserved": "2026-05-23T09:49:26.559Z",
    "dateUpdated": "2026-05-24T05:30:09.671Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9358",
      "date": "2026-05-26",
      "epss": "0.00033",
      "percentile": "0.09983"
    },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.



Detection rules are retrieved from Rulezet.