GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

GHSA-XG8H-J46F-W952

Vulnerability from github – Published: 2025-07-01 17:29 – Updated: 2025-07-02 14:20
VLAI
Summary
Pillow vulnerability can cause write buffer overflow on BCn encoding
Details

There is a heap buffer overflow when writing a sufficiently large (>64k encoded with default settings) image in the DDS format due to writing into a buffer without checking for available space.

This only affects users who save untrusted data as a compressed DDS image.

  • Unclear how large the potential write could be. It is likely limited by process segfault, so it's not necessarily deterministic. It may be practically unbounded.
  • Unclear if there's a restriction on the bytes that could be emitted. It's likely that the only restriction is that the bytes would be emitted in chunks of 8 or 16.

This was introduced in Pillow 11.2.0 when the feature was added.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pillow"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.2.0"
            },
            {
              "fixed": "11.3.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-48379"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-01T17:29:37Z",
    "nvd_published_at": "2025-07-01T19:15:27Z",
    "severity": "HIGH"
  },
  "details": "There is a heap buffer overflow when writing a sufficiently large (\u003e64k encoded with default settings) image in the DDS format due to writing into a buffer without checking for available space. \n\nThis only affects users who save untrusted data as a compressed DDS image. \n\n* Unclear how large the potential write could be. It is likely limited by process segfault, so it\u0027s not necessarily deterministic. It may be practically unbounded. \n* Unclear if there\u0027s a restriction on the bytes that could be emitted. It\u0027s likely that the only restriction is that the bytes would be emitted in chunks of 8 or 16. \n\nThis was introduced in Pillow 11.2.0 when the feature was added.",
  "id": "GHSA-xg8h-j46f-w952",
  "modified": "2025-07-02T14:20:24Z",
  "published": "2025-07-01T17:29:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-xg8h-j46f-w952"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-48379"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-pillow/Pillow/pull/9041"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-pillow/Pillow/commit/ef98b3510e3e4f14b547762764813d7e5ca3c5a4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2025-61.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/python-pillow/Pillow"
    },
    {
      "type": "WEB",
      "url": "https://github.com/python-pillow/Pillow/releases/tag/11.3.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Pillow vulnerability can cause write buffer overflow on BCn encoding"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





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.


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.