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CVE-2026-84446 (GCVE-0-2026-84446)

Vulnerability from cvelistv5 – Published: 2026-09-18 15:54 – Updated: 2026-09-18 15:54
VLAI
Title
libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames
Summary
libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
Impacted products
Vendor Product Version CPE status
strukturag libheif Affected: < 1.23.2
guessed Create a notification for this product.
Show details on NVD website
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          "value": "libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2."
        }
      ],
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
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      "problemTypes": [
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            {
              "cweId": "CWE-835",
              "description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T15:54:48.945Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          "name": "https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8",
          "tags": [
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          "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8"
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          "name": "https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b",
          "tags": [
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          "url": "https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b"
        },
        {
          "name": "https://github.com/strukturag/libheif/releases/tag/v1.23.2",
          "tags": [
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          "url": "https://github.com/strukturag/libheif/releases/tag/v1.23.2"
        }
      ],
      "source": {
        "advisory": "GHSA-xw34-mjcp-jqh8",
        "discovery": "UNKNOWN"
      },
      "title": "libheif: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-84446",
    "datePublished": "2026-09-18T15:54:48.945Z",
    "dateReserved": "2026-09-01T20:05:09.422Z",
    "dateUpdated": "2026-09-18T15:54:48.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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                "vendor": "strukturag",
                "versions": [
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                    "version": "\u003c 1.23.2"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "libheif is a HEIF and AVIF file format decoder and encoder. Prior to 1.23.2, crafted HEIF sequence timing and edit-list data can make Track::init_sample_timing_table() compute a logical m_num_output_samples value that exceeds the uint32_t counters used by Track_Visual::decode_next_image_sample() and Track::get_next_sample_raw_data(). The resulting comparison can never reach the oversized output count, causing non-terminating decode or raw-sample loops and bypassing max_sequence_frames. The same sequence path repeatedly calls Box_stts::get_sample_duration() and allocates Chunk::m_sample_ranges and Track::m_presentation_timeline outside MemoryHandle accounting, allowing severe CPU and memory exhaustion from a small file. This issue is fixed in version 1.23.2."
          }
        ],
        "id": "CVE-2026-84446",
        "lastModified": "2026-09-18T16:17:12.640",
        "metrics": {
          "cvssMetricV31": [
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              "cvssData": {
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                "attackVector": "NETWORK",
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                "privilegesRequired": "NONE",
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              "source": "security-advisories@github.com",
              "type": "Secondary"
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        "published": "2026-09-18T16:17:12.513",
        "references": [
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            "source": "security-advisories@github.com",
            "url": "https://github.com/strukturag/libheif/commit/3a7a69ae325f652e48c026b8241ab25bedf44d9b"
          },
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            "url": "https://github.com/strukturag/libheif/releases/tag/v1.23.2"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-xw34-mjcp-jqh8"
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        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
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                "value": "CWE-835"
              }
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            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
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    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-18T00:25:09Z",
      "cve": "CVE-2026-84446",
      "id": "CVE-2026-84446",
      "initial_release_date": "2026-09-06T23:40:07Z",
      "product_status:first_fixed": "23",
      "product_status:known_affected": "69",
      "product_status:known_not_affected": "27",
      "product_status:recommended": "12",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-84446",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-84446.json",
      "version": "4"
    }
  }
}



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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

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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.
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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.