https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Mon, 28 Sep 2026 12:22:22 +0000 https://vulnerability.circl.lu/vuln/fkie_cve-2026-44637 <p>libsixel is a SIXEL encoder/decoder implementation derived from kmiya&#39;s sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser&#39;s image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context-&gt;pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression &#34;pos_x + repeat_count&#34; used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image-&gt;data and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2.</p> <p>libsixel is a SIXEL encoder/decoder implementation derived from kmiya&#39;s sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser&#39;s image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context-&gt;pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression &#34;pos_x + repeat_count&#34; used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image-&gt;data and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2.</p> https://vulnerability.circl.lu/vuln/fkie_cve-2026-44637 https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-44637 <p><strong>Affected:</strong> Ubuntu:16.04:LTS: libsixel, Ubuntu:18.04:LTS: libsixel, Ubuntu:20.04:LTS: libsixel, Ubuntu:22.04:LTS: libsixel, Ubuntu:24.04:LTS: libsixel, Ubuntu:25.10: libsixel, Ubuntu:26.04:LTS: libsixel</p> <p>libsixel is a SIXEL encoder/decoder implementation derived from kmiya&#39;s sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser&#39;s image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context-&gt;pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression &#34;pos_x + repeat_count&#34; used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image-&gt;data and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2.</p> <p><strong>Affected:</strong> Ubuntu:16.04:LTS: libsixel, Ubuntu:18.04:LTS: libsixel, Ubuntu:20.04:LTS: libsixel, Ubuntu:22.04:LTS: libsixel, Ubuntu:24.04:LTS: libsixel, Ubuntu:25.10: libsixel, Ubuntu:26.04:LTS: libsixel</p> <p>libsixel is a SIXEL encoder/decoder implementation derived from kmiya&#39;s sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser&#39;s image-buffer doubling loop can lead to an out-of-bounds heap write in sixel_decode_raw_impl. context-&gt;pos_x grows by repeat_count on every sixel character with no upper bound check. Once pos_x approaches INT_MAX, the expression &#34;pos_x + repeat_count&#34; used to size the image buffer overflows signed int. Depending on how the overflow wraps, the resize check that should reject oversized buffers can be bypassed, after which a subsequent write computes a large attacker-influenced offset into image-&gt;data and writes past the allocation. Reachable from any caller that decodes attacker-supplied SIXEL data, including img2sixel. This vulnerability is fixed in 1.8.7-r2.</p> https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-44637