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CVE-2026-9539 is an out-of-bounds heap-read vulnerability in freedesktop.org libslirp before version 4.9.2. The flaw is in TCP urgent-data handling in sosendoob, where manipulation of TCP URG flags and the urgent pointer (ti_urp) can cause an integer underflow and an out-of-bounds read from the host process heap. In hypervisor deployments using libslirp for guest networking, such as QEMU user-mode networking, a privileged guest can induce disclosure of memory belonging to the host-side process.
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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.
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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 vulnerability affecting older stable-distribution libslirp packages that, when combined with an unassigned bug-fix commit, reportedly enables arbitrary host memory read/write primitives and a virtual-machine escape.
A known libslirp vulnerability chained with a separate, previously unassigned bug during a controlled VM-escape demonstration, resulting in arbitrary host-memory access.
A libslirp vulnerability affecting Debian 12's libslirp 4.7.0. The agent chained it with a separate fixed but unnumbered libslirp flaw to obtain arbitrary host-memory read/write and successfully escape the QEMU/KVM VM.
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.