Vulnerability-Lookup

FKIE_CVE-2026-49420

Vulnerability from fkie_nvd - Published: 2026-08-19 06:17 - Updated: 2026-09-01 20:20

Severity

8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

The RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet. A host sending crafted RTSP traffic from inside a NAT gateway using libalias can overflow a stack buffer, potentially achieving remote code execution in the kernel (when using ipfw(4) NAT) or in the natd(8) process (which generally runs as the root user).

References

	URL	Tags
	secteam@freebsd.org	https://security.freebsd.org/advisories/FreeBSD-SA-26:41.libalias.asc	Vendor Advisory

Impacted products

Vendor	Product	Version
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.3
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	14.4
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.0
freebsd	freebsd	15.1
freebsd	freebsd	15.1
freebsd	freebsd	15.1

JSON

To clipboard

{
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      "affectedData": [
        {
          "defaultStatus": "unknown",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet.\n\nA host sending crafted RTSP traffic from inside a NAT gateway using libalias can overflow a stack buffer, potentially achieving remote code execution in the kernel (when using ipfw(4) NAT) or in the natd(8) process (which generally runs as the root user)."
    }
  ],
  "id": "CVE-2026-49420",
  "lastModified": "2026-09-01T20:20:12.850",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
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    ],
    "ssvcV203": [
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        "ssvcData": {
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          "options": [
            {
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            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
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          "timestamp": "2026-08-19T00:00:00+00:00",
          "version": "2.0.3"
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  "published": "2026-08-19T06:17:40.790",
  "references": [
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      "source": "secteam@freebsd.org",
      "tags": [
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      ],
      "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:41.libalias.asc"
    }
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  "sourceIdentifier": "secteam@freebsd.org",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "secteam@freebsd.org",
      "type": "Secondary"
    }
  ]
}

CVE-2026-49420 (GCVE-0-2026-49420)

Vulnerability from cvelistv5 – Published: 2026-08-19 05:20 – Updated: 2026-08-20 03:55

Title

Buffer overflow in libalias RTSP handler

Summary

Severity

8.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-19 00:00 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

freebsd mitre root

References

1 reference

URL	Tags
https://security.freebsd.org/advisories/FreeBSD-S…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
FreeBSD	FreeBSD	Affected: 15.1-RELEASE , < p1 (release) Affected: 15.0-RELEASE , < p11 (release) Affected: 14.4-RELEASE , < p7 (release) Affected: 14.3-RELEASE , < p16 (release)

Date Public

2026-06-30 20:00

Credits

Atuin - Automated Vulnerability Discovery Engine, Tianchu Chen of Tencent Xuanwu Lab UC Berkeley Antiproof Stanislav Fort of Aisle Research

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "ADJACENT_NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 8.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-49420",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-19T00:00:00+00:00",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-20T03:55:48.116Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "libalias"
          ],
          "product": "FreeBSD",
          "vendor": "FreeBSD",
          "versions": [
            {
              "lessThan": "p1",
              "status": "affected",
              "version": "15.1-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p11",
              "status": "affected",
              "version": "15.0-RELEASE",
              "versionType": "release"
            },
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              "status": "affected",
              "version": "14.4-RELEASE",
              "versionType": "release"
            },
            {
              "lessThan": "p16",
              "status": "affected",
              "version": "14.3-RELEASE",
              "versionType": "release"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Atuin - Automated Vulnerability Discovery Engine, Tianchu Chen of Tencent Xuanwu Lab"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "UC Berkeley Antiproof"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Stanislav Fort of Aisle Research"
        }
      ],
      "datePublic": "2026-06-30T20:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "The RTSP handler in libalias rewrote outgoing packets into a fixed-length stack buffer without checking whether the rewritten data fit in the buffer, or whether the result fit back in the original packet.\n\nA host sending crafted RTSP traffic from inside a NAT gateway using libalias can overflow a stack buffer, potentially achieving remote code execution in the kernel (when using ipfw(4) NAT) or in the natd(8) process (which generally runs as the root user)."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-121",
              "description": "CWE-121: Stack-based Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T05:20:00.559Z",
        "orgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
        "shortName": "freebsd"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.freebsd.org/advisories/FreeBSD-SA-26:41.libalias.asc"
        }
      ],
      "title": "Buffer overflow in libalias RTSP handler",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "63664ac6-956c-4cba-a5d0-f46076e16109",
    "assignerShortName": "freebsd",
    "cveId": "CVE-2026-49420",
    "datePublished": "2026-08-19T05:20:00.559Z",
    "dateReserved": "2026-05-29T20:24:28.616Z",
    "dateUpdated": "2026-08-20T03:55:48.116Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.