Heap disclosure via unchecked ICO palette indices
Published Jul 23, 2026 · Updated Jul 23, 2026
Out-of-bounds read in gdk-pixbuf2 on Red Hat Enterprise Linux allows remote attackers to disclose heap data through crafted ICO files. The ICO parser accepts pixel indices beyond the actual palette size and treats adjacent heap bytes as RGB palette entries in rendered output. Exploitation requires a crafted ICO to be decoded and its output recovered, such as from an automated thumbnailing service, exposing heap content without modifying it.
Summary
What happened
Out-of-bounds read in gdk-pixbuf2 on Red Hat Enterprise Linux allows remote attackers to disclose heap data through crafted ICO files. The ICO parser accepts pixel indices beyond the actual palette size and treats adjacent heap bytes as RGB palette entries in rendered output. Exploitation requires a crafted ICO to be decoded and its output recovered, such as from an automated thumbnailing service, exposing heap content without modifying it.
The record
- CVE
- CVE-2026-16768
- Published
- Jul 23, 2026
- Updated
- Jul 23, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-125, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 23, 2026CVE publishedPublication date reported by the CVE source.
- Jul 23, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- GNOME gdk-pixbuf issue 302 proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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