Loading vulnerability…
CVE-2026-20889 is a heap-based buffer overflow in the x3f_thumb_loader functionality of LibRaw, affecting at least commit d20315b. The issue is triggered by a specially crafted Sigma X3F image file. According to the provided analysis, an attacker can mutate a legitimate X3F file by modifying thumbnail directory metadata to declare excessively large column and row values. During parsing, this leads to an integer overflow in size calculation, causing allocation of an undersized heap buffer. LibRaw subsequently decodes thumbnail image data into that undersized allocation, resulting in an out-of-bounds heap write and corruption of adjacent heap metadata.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer overflow vulnerability in LibRaw that can be triggered by a specially crafted malicious file.
A heap-based buffer overflow vulnerability in the x3f_thumb_loader functionality of LibRaw Commit d20315b that can be triggered by a specially crafted malicious file.
An integer overflow and resulting heap corruption vulnerability in LibRaw triggered by a maliciously crafted Sigma X3F image file, which can lead to arbitrary write and ultimately code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.