CVE-2026-44638 | Low | 2.5 | 2026-05-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a wrong NULL check after an allocation call in sixel_decode_r… |
CVE-2026-44637 | High | 7.1 | 2026-05-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, a signed integer overflow in the SIXEL parser's image-buffer… |
CVE-2026-44636 | High | 7.4 | 2026-05-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. From to 1.8.7-r1, signed integer overflow in sixel_encode_highcolor's allocatio… |
CVE-2026-33023 | High | 7.8 | 2026-04-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. In versions 1.8.7 and prior, when built with the --with-gdk-pixbuf2 option, a us… |
CVE-2026-33021 | High | 7.3 | 2026-04-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a use-after-free vulnerability in sixel_encoder… |
CVE-2026-33020 | High | 7.1 | 2026-04-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow which leads to a heap buffe… |
CVE-2026-33019 | High | 7.1 | 2026-04-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain an integer overflow leading to an out-of-bounds… |
CVE-2026-33018 | High | 7.0 | 2026-04-14 | libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel. Versions 1.8.7 and prior contain a Use-After-Free vulnerability via the load_gif… |
CVE-2025-61146 | Medium | 4.0 | 2026-02-23 | saitoha libsixel until v1.8.7 was discovered to contain a memory leak via the component malloc_stub.c. |
CVE-2025-9300 | Medium | 5.3 | 2025-08-21 | A vulnerability was found in saitoha libsixel up to 1.10.3. Affected by this issue is the function sixel_debug_print_palette of the file src/encoder.c of the c… |
CVE-2022-29978 | Medium | 6.5 | 2022-05-11 | There is a floating point exception error in sixel_encoder_do_resize, encoder.c:633 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerabi… |
CVE-2022-29977 | Medium | 6.5 | 2022-05-11 | There is an assertion failure error in stbi__jpeg_huff_decode, stb_image.h:1894 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability… |
CVE-2022-27046 | High | 8.8 | 2022-04-08 | libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388. |
CVE-2022-27044 | High | 8.8 | 2022-04-08 | libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876. |
CVE-2022-27938 | Medium | 5.5 | 2022-03-26 | stb_image.h (aka the stb image loader) 2.19, as used in libsixel and other products, has a reachable assertion in stbi__create_png_image_raw. |
CVE-2021-46700 | Medium | 6.5 | 2022-02-19 | In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free. |
CVE-2020-21548 | High | 8.8 | 2021-09-17 | Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c. |
CVE-2020-21547 | High | 8.8 | 2021-09-17 | Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c. |
CVE-2020-21050 | Medium | 6.5 | 2021-09-14 | Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c. |
CVE-2020-21049 | Medium | 6.5 | 2021-09-14 | An invalid read in the stb_image.h component of libsixel prior to v1.8.5 allows attackers to cause a denial of service (DOS) via a crafted PSD file. |
CVE-2020-21048 | Medium | 6.5 | 2021-09-14 | An issue in the dither.c component of libsixel prior to v1.8.4 allows attackers to cause a denial of service (DOS) via a crafted PNG file. |
CVE-2020-21677 | Medium | 6.5 | 2021-08-10 | A heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (D… |
CVE-2020-36120 | High | 7.5 | 2021-04-14 | Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS). |
CVE-2020-19668 | Medium | 6.5 | 2020-11-20 | Unverified indexs into the array lead to out of bound access in the gif_out_code function in fromgif.c in libsixel 1.8.6. |
CVE-2020-11721 | Medium | 6.5 | 2020-04-12 | load_png in loader.c in libsixel.a in libsixel 1.8.6 has an uninitialized pointer leading to an invalid call to free, which can cause a denial of service. |
CVE-2019-20205 | High | 8.8 | 2020-01-02 | libsixel 1.8.4 has an integer overflow in sixel_frame_resize in frame.c. |
CVE-2019-20140 | High | 8.8 | 2019-12-30 | An issue was discovered in libsixel 1.8.4. There is a heap-based buffer overflow in the function gif_out_code at fromgif.c. |
CVE-2019-20094 | High | 8.8 | 2019-12-30 | An issue was discovered in libsixel 1.8.4. There is a heap-based buffer overflow in the function gif_init_frame at fromgif.c. |
CVE-2019-20024 | Medium | 6.5 | 2019-12-27 | A heap-based buffer overflow was discovered in image_buffer_resize in fromsixel.c in libsixel before 1.8.4. |
CVE-2019-20023 | Medium | 6.5 | 2019-12-27 | A memory leak was discovered in image_buffer_resize in fromsixel.c in libsixel 1.8.4. |
CVE-2019-20022 | Medium | 6.5 | 2019-12-27 | An invalid memory address dereference was discovered in load_pnm in frompnm.c in libsixel before 1.8.3. |
CVE-2019-19778 | High | 8.8 | 2019-12-13 | An issue was discovered in libsixel 1.8.2. There is a heap-based buffer over-read in the function load_sixel at loader.c. |
CVE-2019-19777 | High | 8.8 | 2019-12-13 | stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has a heap-based buffer over-read in stbi__load_main. |
CVE-2019-19638 | Critical | 9.8 | 2019-12-08 | An issue was discovered in libsixel 1.8.2. There is a heap-based buffer overflow in the function load_pnm at frompnm.c, due to an integer overflow. |
CVE-2019-19637 | Critical | 9.8 | 2019-12-08 | An issue was discovered in libsixel 1.8.2. There is an integer overflow in the function sixel_decode_raw_impl at fromsixel.c. |
CVE-2019-19636 | Critical | 9.8 | 2019-12-08 | An issue was discovered in libsixel 1.8.2. There is an integer overflow in the function sixel_encode_body at tosixel.c. |
CVE-2019-19635 | Critical | 9.8 | 2019-12-08 | An issue was discovered in libsixel 1.8.2. There is a heap-based buffer overflow in the function sixel_decode_raw_impl at fromsixel.c. |
CVE-2019-11024 | Medium | 5.5 | 2019-04-08 | The load_pnm function in frompnm.c in libsixel.a in libsixel 1.8.2 has infinite recursion. |
CVE-2019-3574 | High | 7.8 | 2019-01-02 | In libsixel v1.8.2, there is a heap-based buffer over-read in the function load_jpeg() in the file loader.c, as demonstrated by img2sixel. |
CVE-2019-3573 | Medium | 5.5 | 2019-01-02 | In libsixel v1.8.2, there is an infinite loop in the function sixel_decode_raw_impl() in the file fromsixel.c, as demonstrated by sixel2png. |
CVE-2018-19763 | Medium | 5.5 | 2018-11-30 | There is a heap-based buffer over-read at writer.c (function: write_png_to_file) in libsixel 1.8.2 that will cause a denial of service. |
CVE-2018-19762 | High | 7.8 | 2018-11-30 | There is a heap-based buffer overflow at fromsixel.c (function: image_buffer_resize) in libsixel 1.8.2 that will cause a denial of service or possibly unspecif… |
CVE-2018-19761 | Medium | 5.5 | 2018-11-30 | There is an illegal address access at fromsixel.c (function: sixel_decode_raw_impl) in libsixel 1.8.2 that will cause a denial of service. |
CVE-2018-19759 | Medium | 5.5 | 2018-11-30 | There is a heap-based buffer over-read at stb_image_write.h (function: stbi_write_png_to_mem) in libsixel 1.8.2 that will cause a denial of service. |
CVE-2018-19757 | Medium | 6.5 | 2018-11-30 | There is a NULL pointer dereference at function sixel_helper_set_additional_message (status.c) in libsixel 1.8.2 that will cause a denial of service. |
CVE-2018-19756 | Medium | 5.5 | 2018-11-30 | There is a heap-based buffer over-read at stb_image.h (function: stbi__tga_load) in libsixel 1.8.2 that will cause a denial of service. |
CVE-2018-14073 | High | 7.5 | 2018-07-15 | libsixel 1.8.1 has a memory leak in sixel_allocator_new in allocator.c. |
CVE-2018-14072 | High | 7.5 | 2018-07-15 | libsixel 1.8.1 has a memory leak in sixel_decoder_decode in decoder.c, image_buffer_resize in fromsixel.c, and sixel_decode_raw in fromsixel.c. |