FKIE_CVE-2026-4271

Vulnerability from fkie_nvd - Published: 2026-03-17 12:16 - Updated: 2026-06-17 10:56
Severity
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS).
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:15968
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:17482
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2026:19143
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2026-4271Vendor Advisory
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2448044Issue Tracking, Vendor Advisory
secalert@redhat.comhttps://gitlab.gnome.org/GNOME/libsoup/-/issues/496Exploit, Issue Tracking, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://gitlab.gnome.org/GNOME/libsoup/-/issues/496Exploit, Issue Tracking, Vendor Advisory
Impacted products
Vendor Product Version
gnome libsoup -
redhat enterprise_linux 6.0
redhat enterprise_linux 7.0
redhat enterprise_linux 8.0
redhat enterprise_linux 9.0
redhat enterprise_linux 10.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "libsoup3",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat",
          "versions": [
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              "status": "unaffected",
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              "versionType": "rpm"
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        },
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          "cpes": [
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          "defaultStatus": "affected",
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          "vendor": "Red Hat",
          "versions": [
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              "versionType": "rpm"
            }
          ]
        },
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          "cpes": [
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          ],
          "defaultStatus": "affected",
          "packageName": "libsoup3",
          "product": "Red Hat Enterprise Linux 10.0 Extended Update Support",
          "vendor": "Red Hat",
          "versions": [
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              "status": "unaffected",
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            }
          ]
        },
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          "cpes": [
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          "defaultStatus": "affected",
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          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        },
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          "cpes": [
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          ],
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          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
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          ],
          "defaultStatus": "unaffected",
          "packageName": "libsoup",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
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          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "unaffected",
          "packageName": "libsoup",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "configurations": [
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      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:gnome:libsoup:-:*:*:*:*:*:*:*",
              "matchCriteriaId": "C5BAC4F4-3ACD-4F4D-920C-F920FD2C5472",
              "vulnerable": true
            },
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              "matchCriteriaId": "2F6AB192-9D7D-4A9A-8995-E53A9DE9EAFC",
              "vulnerable": true
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              "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A",
              "vulnerable": true
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              "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943",
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              "matchCriteriaId": "D65C2163-CFC2-4ABB-8F4E-CB09CEBD006C",
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          "negate": false,
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in libsoup, a library for handling HTTP requests. This vulnerability, known as a Use-After-Free, occurs in the HTTP/2 server implementation. A remote attacker can exploit this by sending specially crafted HTTP/2 requests that cause authentication failures. This can lead to the application attempting to access memory that has already been freed, potentially causing application instability or crashes, resulting in a Denial of Service (DoS)."
    },
    {
      "lang": "es",
      "value": "Se encontr\u00f3 un defecto en libsoup, una biblioteca para manejar solicitudes HTTP. Esta vulnerabilidad, conocida como un uso despu\u00e9s de liberaci\u00f3n, ocurre en la implementaci\u00f3n del servidor HTTP/2. Un atacante remoto puede explotar esto enviando solicitudes HTTP/2 especialmente dise\u00f1adas que causan fallos de autenticaci\u00f3n. Esto puede llevar a que la aplicaci\u00f3n intente acceder a memoria que ya ha sido liberada, lo que podr\u00eda causar inestabilidad o ca\u00eddas de la aplicaci\u00f3n, resultando en una denegaci\u00f3n de servicio (DoS)."
    }
  ],
  "id": "CVE-2026-4271",
  "lastModified": "2026-06-17T10:56:20.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
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        "impactScore": 1.4,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
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        "ssvcData": {
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          "options": [
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              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-17T13:04:24.452812Z",
          "version": "2.0.3"
        }
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  "published": "2026-03-17T12:16:13.280",
  "references": [
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      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:15968"
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      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:17482"
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      "url": "https://access.redhat.com/errata/RHSA-2026:19143"
    },
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      "tags": [
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      "tags": [
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448044"
    },
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      "source": "secalert@redhat.com",
      "tags": [
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  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}


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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.