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libsixel: update to 1.8.3. (security fixes)
Upstream changes: v1.8.3 * Security fix for CVE-2018-19757 (#79), NULL pointer dereference problem, reported by @nluedtke and fixed by @knok (#91, #94). * Security fix for CVE-2018-19762 (#81), heap-based buffer overflow problem, reported by @nluedtke and fixed by @knok (#92). * Security fix for CVE-2018-19756 (#80), heap-based buffer over-read problem, reported by @nluedtke and fixed by @knok (#93). * Security fix for CVE-2018-19763 (#82), heap-based buffer over-read problem, reported by @nluedtke and fixed by @knok (#95). * Security fix for CVE-2018-19761, illegal address access, fixed by @knok (#96). * Security fix for CVE-2018-19759, heap-based buffer over-read problem, fixed by @knok (#98). * Security fix for CVE-2018-3753 (#83), infinite loop problem, reported by @cool-tomato and fixed by @knok (#99). * Security fix for CVE-2018-19759 (#102), heap-based buffer over-read that will cause a denial of service. reported and fixed by @YourButterfly. (#106) * Security fix for CVE-2019-19635 (#103), heap-based buffer overflow, reported and fixed by @YourButterfly. (#106) * Security fix for CVE-2019-19636 (#104) and CVE-2019-19637 (#105), integer overflow problem. reported and fixed by @YourButterfly. (#106) * gif loader: check LZW code size (Issue #75), Thanks to @hongxuchen. saitoha/libsixel@7808a06 * core: Fix a global-buffer-overflow problem (Issue #72), Thanks to @fgeek. saitoha/libsixel@c868b59 * core: Fix unexpected hangs/performance issues (Issue #76), Thanks to @hongxuchen. saitoha/libsixel@88561b7 saitoha/libsixel@2d3d9ff saitoha/libsixel@c9363cd
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