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CVE-2026-20889 is a heap-based buffer overflow in LibRaw's x3f_thumb_loader functionality in commit d20315b. Processing a specially crafted Sigma X3F image can trigger unsafe memory handling during thumbnail loading, resulting in an out-of-bounds heap write and memory corruption. The vulnerability is associated with integer-overflow conditions and is classified as CWE-190.
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What an attacker gets, and what they’ve been doing with it.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A LibRaw vulnerability in darktable allowing arbitrary code execution through processing of a specially crafted image file.
A LibRaw vulnerability affecting darktable that enables arbitrary code execution through a specially crafted image file.
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.
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.