CVE-2026-70653

Heap disclosure via Radiance repeat marker

Published Aug 20, 2026 · Updated Aug 20, 2026

Heap over-read in libvips before 8.18.3 allows local users to read adjacent heap data via a crafted Radiance image. In libvips/foreign/radiance.c, scanline_read_old accepts an old-style RLE repeat marker at the start of a scanline and then copies from q[-1] even though no prior pixel exists. Reachability requires processing attacker-supplied Radiance files through VipsForeignLoadRad with the deprecated old-style decoder path enabled, and the disclosed data is bounded to four adjacent heap bytes, most likely neighboring image data.

CVSS severity4.8
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap over-read in libvips before 8.18.3 allows local users to read adjacent heap data via a crafted Radiance image. In libvips/foreign/radiance.c, scanline_read_old accepts an old-style RLE repeat marker at the start of a scanline and then copies from q[-1] even though no prior pixel exists. Reachability requires processing attacker-supplied Radiance files through VipsForeignLoadRad with the deprecated old-style decoder path enabled, and the disclosed data is bounded to four adjacent heap bytes, most likely neighboring image data.

The record

CVE
CVE-2026-70653
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
libvips
Product
libvips
Classifications
CWE-122
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=< 8.18.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

libvips · libvipsversion=< 8.18.3

Published CVSS scores

4.8GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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