{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.9.0"
              },
              {
                "last_affected": "1.10.5"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "857185461d8703bbe4f4ed4b5c18f8292fd675f2"
            },
            {
              "last_affected": "37026b01a0bd38634ae0a8c5017bd4671101fe08"
            }
          ],
          "repo": "https://github.com/libsixel/libsixel",
          "type": "GIT"
        }
      ]
    },
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.8.7-r1"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6d628cf43548e1f2739cbb13afcc6e8257868db5"
            }
          ],
          "repo": "https://github.com/saitoha/libsixel",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110601.json"
  },
  "details": "libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size. Attackers can supply a crafted GIF with a small color table and large transparent index, processed with a background color set, to write bytes past the palette buffer, causing heap corruption or crashes.",
  "id": "CVE-2026-110601",
  "modified": "2026-10-15T02:30:44.256982646Z",
  "published": "2026-10-14T14:16:43.022Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110601.json"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/saitoha/libsixel"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248"
    },
    {
      "type": "FIX",
      "url": "https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/saitoha/libsixel/issues/220"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1"
    },
    {
      "type": "ADVISORY",
      "url": "https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110601"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/libsixel-before-1.8.7-r1-and-1.9.0-through-1.10.5-heap-out-of-bounds-write-via-gif"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF"
}