Vulnerability-Lookup

GHSA-2V62-QXWF-QH42

Vulnerability from github – Published: 2026-04-01 09:31 – Updated: 2026-04-01 18:36

Details

Some keywords representing actions taken on a packet-matching rule, such as 'log', 'return tll', or 'dnpipe', may suffer from the same issue. It is unlikely that users have such configurations, as these rules would always be redundant.

Affected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.

Severity ?

7.5 (High)


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

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-4748"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-480"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-01T07:16:02Z",
    "severity": "HIGH"
  },
  "details": "A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates.  Only the first of such rules is actually loaded into pf.  Ranges expressed using the address[/mask-bits] syntax were not affected.\n\nSome keywords representing actions taken on a packet-matching rule, such as \u0027log\u0027, \u0027return tll\u0027, or \u0027dnpipe\u0027, may suffer from the same issue.  It is unlikely that users have such configurations, as these rules would always be redundant.\n\nAffected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.",
  "id": "GHSA-2v62-qxwf-qh42",
  "modified": "2026-04-01T18:36:35Z",
  "published": "2026-04-01T09:31:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4748"
    },
    {
      "type": "WEB",
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:09.pf.asc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-4748 (GCVE-0-2026-4748)

Vulnerability from cvelistv5 – Published: 2026-04-01 06:18 – Updated: 2026-04-01 14:56

Title

pf silently ignores certain rules

Summary

A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates. Only the first of such rules is actually loaded into pf. Ranges expressed using the address[/mask-bits] syntax were not affected. Some keywords representing actions taken on a packet-matching rule, such as 'log', 'return tll', or 'dnpipe', may suffer from the same issue. It is unlikely that users have such configurations, as these rules would always be redundant. Affected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.

Severity ?

7.5 (High)


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

CWE

CWE-480 - Use of Incorrect Operator
CWE-754 - Improper Check for Unusual or Exceptional Conditions
CWE-1023 - Incomplete Comparison with Missing Factors

Assigner

freebsd

References

URL

Tags

https://security.freebsd.org/advisories/FreeBSD-S…

vendor-advisory

Impacted products

	Vendor	Product	Version
	FreeBSD	FreeBSD	Affected: 15.0-RELEASE , < p5 (release) Affected: 14.4-RELEASE , < p1 (release) Affected: 14.3-RELEASE , < p10 (release)

Date Public ?

2026-03-26 05:00

Credits

Michael Gmelin

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-4748",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-01T14:55:44.105033Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-01T14:56:02.208Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "pf"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p5",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p1",
              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p10",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Michael Gmelin"
        }
      ],
      "datePublic": "2026-03-26T05:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates.  Only the first of such rules is actually loaded into pf.  Ranges expressed using the address[/mask-bits] syntax were not affected.\n\nSome keywords representing actions taken on a packet-matching rule, such as \u0027log\u0027, \u0027return tll\u0027, or \u0027dnpipe\u0027, may suffer from the same issue.  It is unlikely that users have such configurations, as these rules would always be redundant.\n\nAffected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-480",
              "description": "CWE-480: Use of Incorrect Operator",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-754",
              "description": "CWE-754: Improper Check for Unusual or Exceptional Conditions",
              "lang": "en",
              "type": "CWE"
            },
            {
              "cweId": "CWE-1023",
              "description": "CWE-1023: Incomplete Comparison with Missing Factors",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-01T06:18:52.097Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:09.pf.asc"
        }
      ],
      "title": "pf silently ignores certain rules",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-4748",
    "datePublished": "2026-04-01T06:18:52.097Z",
    "dateReserved": "2026-03-24T04:14:17.566Z",
    "dateUpdated": "2026-04-01T14:56:02.208Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-2V62-QXWF-QH42

CVE-2026-4748 (GCVE-0-2026-4748)

Tags

Sightings

Nomenclature