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CVE-2026-56711 (GCVE-0-2026-56711)

Vulnerability from cvelistv5 – Published: 2026-09-09 13:31 – Updated: 2026-09-09 13:31
VLAI
Title
VLC media player 3.0.0 through 3.0.23 Heap Out-of-Bounds Write via Integer Overflow in Picture Allocation
Summary
VLC media player computes the size of a picture buffer with 32-bit arithmetic and allocates from the wrapped result. In AllocatePicture in src/misc/picture.c the running total is accumulated as i_bytes += p->i_pitch * p->i_lines, and both plane_t fields are declared int in include/vlc_picture.h, so the multiplication is evaluated at 32 bits and wraps before it is widened to the size_t accumulator. The overflow check that precedes it divides in 64-bit arithmetic and therefore does not constrain the product, and the subsequent comparison against PICTURE_SW_SIZE_MAX examines the already wrapped value, so both guards pass. aligned_alloc then reserves the small wrapped size while the decoder writes scanlines sized from the original dimensions. A crafted PNG whose IHDR declares large width and height reaches this path through the image demuxer, whose only size guard is on the input file's byte count rather than the declared dimensions, and the decoder in modules/codec/png.c writes past the end of the allocation with attacker-influenced length and content. Opening the file directly or through a playlist entry is sufficient, with no non-default settings.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
  • CWE-190 - Integer Overflow or Wraparound
  • CWE-787 - Out-of-bounds Write
Assigner
References
Impacted products
Vendor Product Version CPE status
VideoLAN VLC media player Affected: 3.0.0 , ≤ 3.0.23 (semver)
    cpe:2.3:a:videolan:vlc_media_player:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-23 00:00
Credits
Fabian Wahle (Hap Security)
Show details on NVD website
To clipboard 

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          "packageURL": "pkg:github/videolan/vlc",
          "product": "VLC media player",
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      ],
      "title": "VLC media player 3.0.0 through 3.0.23 Heap Out-of-Bounds Write via Integer Overflow in Picture Allocation",
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    "datePublished": "2026-09-09T13:31:58.330Z",
    "dateReserved": "2026-06-22T18:48:27.060Z",
    "dateUpdated": "2026-09-09T13:31:58.330Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "percentile": "0.22402"
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    "redhat_vex": {
      "current_release_date": "2026-09-09T15:54:30+00:00",
      "cve": "CVE-2026-56711",
      "id": "CVE-2026-56711",
      "initial_release_date": "2026-09-09T13:31:58.330000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "vlc: VLC media player: Arbitrary code execution via integer overflow in picture allocation",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56711.json",
      "version": "3"
    }
  }
}



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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

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.