CVE-2026-48029Public exploitNetwork attack vector

Application crash via rotated tile-coordinate underflow

Published Jul 22, 2026 · Updated Jul 22, 2026

Out-of-bounds read in libheif 1.19.0 through 1.21.2 allows remote attackers to crash decoding applications via crafted HEIF files. ImageItem::transform_requested_tile_position_to_original_tile_position subtracts caller-controlled tile coordinates from pre-rotation unsigned dimensions without bounds checks, causing underflow; ImageItem_Grid::decode_grid_tile then indexes m_grid_tile_ids without a release-build bounds check. A user or service must decode a non-square grid image with an irot property; the demonstrated result is a reliable process crash, while the four-byte read is not a direct external disclosure primitive.

CVSS severity7.1
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in libheif 1.19.0 through 1.21.2 allows remote attackers to crash decoding applications via crafted HEIF files. ImageItem::transform_requested_tile_position_to_original_tile_position subtracts caller-controlled tile coordinates from pre-rotation unsigned dimensions without bounds checks, causing underflow; ImageItem_Grid::decode_grid_tile then indexes m_grid_tile_ids without a release-build bounds check. A user or service must decode a non-square grid image with an irot property; the demonstrated result is a reliable process crash, while the four-byte read is not a direct external disclosure primitive.

The record

CVE
CVE-2026-48029
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
Struktur AG
Product
libheif
Classifications
CWE-125, CWE-191, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.19.0, < 1.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libheifversion=>= 1.19.0, < 1.22.0

Published CVSS scores

7.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-191Integer Underflow (Wrap or Wraparound)
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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