Priority MEDIUM 59
libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size.
CVSS 4.0MEDIUM 5.8· Local · No auth · User interaction · EPSS 0.00236 · Published 2026-10-14 · Fixed in 1.8.7-r1 CWE-787
Priority HIGH 66
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.1· Local · No auth · User interaction · EPSS 0.0016 · Published 2026-05-14 · Fixed in 1.8.7-r2 CWE-190
Priority HIGH 69
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.8· Local · Low privileges · No interaction · EPSS 0.00104 · Published 2026-05-14 · Fixed in 1.8.7-r2 CWE-122
Priority MEDIUM 46
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1LOW 2.5· Local · No auth · User interaction · EPSS 0.00131 · Published 2026-05-14 · Fixed in 1.8.7-r2 CWE-476
Priority HIGH 69
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.8· Local · No auth · User interaction · EPSS 0.00289 · Published 2026-04-14 · Fixed in 1.8.7-r1 CWE-416
Priority HIGH 65
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.3· Local · No auth · No interaction · EPSS 0.00247 · Published 2026-04-14 · Fixed in 1.8.7-r1 CWE-416
Priority HIGH 66
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.1· Local · No auth · User interaction · EPSS 0.00205 · Published 2026-04-14 · Fixed in 1.8.7-r1 CWE-122
Priority MEDIUM 64
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.1· Local · No auth · User interaction · EPSS 0.00256 · Published 2026-04-14 · Fixed in 1.8.7-r1 CWE-125
Priority HIGH 66
libsixel is a SIXEL encoder/decoder implementation derived from kmiya's sixel.
CVSS 3.1HIGH 7.0· Local · No auth · User interaction · EPSS 0.00191 · Published 2026-04-14 · Fixed in 1.8.7-rc1 CWE-416
Priority MEDIUM 52
saitoha libsixel until v1.8.7 was discovered to contain a memory leak via the component malloc_stub.c.
CVSS 3.1MEDIUM 4.0· Local · No auth · No interaction · EPSS 0.00137 · Published 2026-02-23 · No fix listed CWE-401
Priority MEDIUM 55
A vulnerability was found in saitoha libsixel up to 1.10.3.
CVSS 4.0MEDIUM 4.8· Local · Low privileges · No interaction · EPSS 0.00256 · Published 2025-08-21 · No fix listed CWE-119
Priority LOW 31
There is a floating point exception error in sixel_encoder_do_resize, encoder.c:633 in libsixel img2sixel 1.8.6.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.01037 · Published 2022-05-11 · No fix listed CWE-682
Priority LOW 31
There is an assertion failure error in stbi__jpeg_huff_decode, stb_image.h:1894 in libsixel img2sixel 1.8.6.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.01037 · Published 2022-05-11 · No fix listed CWE-617
Priority MEDIUM 40
libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876.
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.01019 · Published 2022-04-08 · No fix listed CWE-787
Priority MEDIUM 40
libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388.
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.01019 · Published 2022-04-08 · No fix listed CWE-416
Priority LOW 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.
CVSS 3.1MEDIUM 5.5· Local · No auth · User interaction · EPSS 0.00614 · Published 2022-03-26 · No fix listed CWE-617
Priority LOW 31
In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.00955 · Published 2022-02-19 · No fix listed CWE-415
Priority MEDIUM 40
Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.01064 · Published 2021-09-17 · No fix listed CWE-787
Priority MEDIUM 40
Libsixel 1.8.2 contains a heap-based buffer overflow in the dither_func_fs function in tosixel.c.
CVSS 3.1HIGH 8.8· Network · No auth · User interaction · EPSS 0.01064 · Published 2021-09-17 · No fix listed CWE-787
Priority LOW 32
Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.01551 · Published 2021-09-14 · No fix listed CWE-787
Priority LOW 32
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.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.01376 · Published 2021-09-14 · No fix listed CWE-125
Priority LOW 32
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.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.01376 · Published 2021-09-14 · No fix listed
Priority LOW 31
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 (DOS) via converting a crafted PNG file into Sixel format.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.00904 · Published 2021-08-10 · No fix listed CWE-787
Priority LOW 35
Buffer Overflow in the "sixel_encoder_encode_bytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS).
CVSS 3.1HIGH 7.5· Network · No auth · No interaction · EPSS 0.01241 · Published 2021-04-14 · No fix listed CWE-120
Priority LOW 30
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.
CVSS 3.1MEDIUM 6.5· Network · No auth · User interaction · EPSS 0.00856 · Published 2020-11-20 · No fix listed CWE-125
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