Medium severity4.8NVD Advisory· Published Jul 14, 2026· Updated Sep 16, 2026
CVE-2026-12478
CVE-2026-12478
Description
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.
Affected products
4- Range: <3.6.6
- osv-coords3 versionspkg:rpm/opensuse/libsoup2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/libsoup&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/libsoup&distro=openSUSE%20Leap%2016.0
< 2.74.3-24.1+ 2 more
- (no CPE)range: < 2.74.3-24.1
- (no CPE)range: < 3.6.6-7.1
- (no CPE)range: < 3.6.6-160000.3.1
Patches
Vulnerability mechanics
References
3News mentions
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