Vulnerability-Lookup

CVE-2026-33019 (GCVE-0-2026-33019)

Vulnerability from cvelistv5 – Published: 2026-04-14 21:49 – Updated: 2026-04-15 20:02

Title

libsixel: Integer overflow leads to Out-of-bounds Read in img2sixel

Summary

libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.

Severity

7.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/saitoha/libsixel/security/advi…	x_refsource_CONFIRM
https://github.com/saitoha/libsixel/releases/tag/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
saitoha	libsixel	Affected: < 1.8.7-r1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33019

Vulnerability from fkie_nvd - Published: 2026-04-14 22:16 - Updated: 2026-06-17 10:36

Severity

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

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1	Release Notes
security-advisories@github.com	https://github.com/saitoha/libsixel/security/advisories/GHSA-c854-ffg9-g72c	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/saitoha/libsixel/security/advisories/GHSA-c854-ffg9-g72c	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	saitoha	libsixel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "libsixel",
          "vendor": "saitoha",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.8.7-r1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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              "matchCriteriaId": "E16EAA6A-544F-4D16-829D-1B7C9979EA6A",
              "versionEndExcluding": "1.8.7-r1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
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    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "libsixel is a SIXEL encoder/decoder implementation derived from kmiya\u0027s sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1."
    }
  ],
  "id": "CVE-2026-33019",
  "lastModified": "2026-06-17T10:36:47.437",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
          "version": "3.1"
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        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
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          "options": [
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    },
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        "Exploit",
        "Vendor Advisory"
      ],
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    },
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        "Vendor Advisory"
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    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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        },
        {
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        }
      ],
      "source": "security-advisories@github.com",
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}

ubuntu-cve-2026-33019

Vulnerability from osv_ubuntu

Published

2026-04-14 22:16

Modified

2026-05-20 15:27

Summary

Details

Severity

7.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-33019	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-33019	REPORT
	https://github.com/saitoha/libsixel/security/advi…	REPORT
	https://github.com/saitoha/libsixel/releases/tag/…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.5.2-2"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.5.2-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.5.2-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.2-1",
        "1.5.2-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.7.3-1"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.7.3-1"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.7.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.7.3-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-2",
        "1.7.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.8.2-2.1"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.8.2-2.1"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.8.2-2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.8.2-2.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.2-1",
        "1.8.2-2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.10.3-3"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.10.3-3"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.10.3-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.10.3-3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.6-2",
        "1.10.3-2",
        "1.10.3-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.10.3-3build1"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.10.3-3build1"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.10.3-3build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.10.3-3build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.3-3",
        "1.10.3-3build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.10.5-1"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.10.5-1"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.10.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.10.5-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsixel-bin",
            "binary_version": "1.10.5-1build1"
          },
          {
            "binary_name": "libsixel-examples",
            "binary_version": "1.10.5-1build1"
          },
          {
            "binary_name": "libsixel1",
            "binary_version": "1.10.5-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libsixel",
        "purl": "pkg:deb/ubuntu/libsixel@1.10.5-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.5-1",
        "1.10.5-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "libsixel is a SIXEL encoder/decoder implementation derived from kmiya\u0027s sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds heap read in the --crop option handling of img2sixel, where positive coordinates up to INT_MAX are accepted without overflow-safe bounds checking. In sixel_encoder_do_clip(), the expression clip_w + clip_x overflows to a large negative value when clip_x is INT_MAX, causing the bounds guard to be skipped entirely, and the unclamped coordinate is passed through sixel_frame_clip() to clip(), which computes a source pointer far beyond the image buffer and passes it to memmove(). An attacker supplying a specially crafted crop argument with any valid image can trigger an out-of-bounds read in the heap, resulting in a reliable crash and potential information disclosure. This issue has been fixed in version 1.8.7-r1.",
  "id": "UBUNTU-CVE-2026-33019",
  "modified": "2026-05-20T15:27:21Z",
  "published": "2026-04-14T22:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-33019"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-33019"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-c854-ffg9-g72c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-33019"
  ]
}

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.

Action not permitted

CVE-2026-33019 (GCVE-0-2026-33019)

FKIE_CVE-2026-33019

ubuntu-cve-2026-33019

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature