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CVE-2026-120245

FFmpeg 0.10 through 9.0.2 Uninitialized Memory Disclosure via Sun Raster Decoder

FFmpeg 0.10 through 9.0.2 contains an uninitialized memory disclosure vulnerability in sunrast_decode_frame() in libavcodec/sunrast.c that leaves decoded image regions unwritten for truncated input. Attackers can supply a crafted truncated Sun Raster image, RLE-encoded or raw, to leak stale heap contents such as allocator metadata through the decoded picture.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
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CVE-2026-120244

FFmpeg 2.1 through 9.0.2 Uninitialized Memory Leak via PCX Decoder

FFmpeg 2.1 through 9.0.2 contains an uninitialized memory disclosure vulnerability in pcx_decode_frame() in libavcodec/pcx.c that leaves scanline buffer bytes uncleared when input ends early. Attackers can supply a crafted truncated RLE-compressed or uncompressed PCX image to leak heap memory contents through the decoded pixels.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
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CVE-2026-125259

FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder

FFmpeg through 9.0.2 contains an integer overflow vulnerability in ff_prores_kostya_encode_init() that miscalculates frame_size_upper_bound using 32-bit arithmetic for large frame dimensions. Attackers can supply a high-resolution video transcoded with the prores_ks encoder, causing encode_frame() to write slices past an undersized packet buffer and corrupt heap memory.

CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
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CVE-2026-125247

FFmpeg through 9.0.2 Integer Overflow via dng_decode_tiles() in libavcodec/tiff.c

FFmpeg through 9.0.2 contains an integer overflow vulnerability in dng_decode_tiles() that allows attackers to leak uninitialized memory via crafted DNG tile dimensions. Attackers can set TileWidth or TileLength near INT_MAX so the tile loop never runs, outputting a frame exposing uninitialized or stale heap memory.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125184

FFmpeg 6.1 through 9.0.2 Information Disclosure via CamStudio Decoder cscd.c

FFmpeg 6.1 through 9.0.2 contains an information disclosure vulnerability in the CamStudio decoder (libavcodec/cscd.c) that copies uninitialized heap memory into decoded frames when decompressed payloads are short. Attackers can supply a crafted AVI with a CSCD stream whose LZO or zlib frames decompress to fewer bytes than the frame size, recovering heap contents from the decoded or re-encoded output.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125255

FFmpeg through 9.0.2 Use-After-Free in MJPEG Hardware-Accelerated Decoding

FFmpeg through 9.0.2 contains a use after free vulnerability in libavcodec/mjpegdec.c that allows attackers to trigger freed buffer reads by sending a SOF marker without a preceding SOI. Attackers can supply crafted MJPEG streams causing ff_mjpeg_decode_sof() to pass a stale raw_image_buffer pointer to hwaccel decoders like NVDEC, crashing applications or leaking heap contents.

CVSS 4.0 · 5.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125176

FFmpeg through 9.0.2 Uninitialized Memory Read in Flash Screen Video 2 Decoder

FFmpeg through 9.0.2 contains an uninitialized memory read vulnerability in decode_hybrid() in libavcodec/flashsv.c that reads past decompressed data when decoding 15-bit color pixels. Attackers can supply a crafted Flash Screen Video 2 block whose inflated data ends mid-pixel to leak heap memory into decoded output frames.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125099

FFmpeg through 9.0.2 Uninitialized Memory Disclosure via GEM Raster Decoder

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in the GEM raster image decoder in libavcodec/gemdec.c that exposes uninitialized row-buffer bytes. Attackers can supply a crafted GEM .img image using SKIP or pattern opcodes to copy uninitialized heap memory into decoded frames, disclosing heap contents.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
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CVE-2026-125073

FFmpeg through 9.0.2 Infinite Loop Denial of Service via IMC/IAC Decoder

FFmpeg through 9.0.2 contains an infinite loop vulnerability in bit_allocation() in libavcodec/imc.c that allows attackers to hang decoding by supplying audio blocks with a negative bit budget. Attackers can craft IMC or IAC audio files that drive freebits negative, causing the reduction loop to never terminate and consuming 100% CPU.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125251

FFmpeg through 9.0.2 VVC Decoder Heap Out-of-Bounds Write via refs.c

FFmpeg through 9.0.2 contains an integer overflow vulnerability in the VVC decoder alloc_frame() function in libavcodec/vvc/refs.c that undersizes the reference picture list allocation on 32-bit builds. Attackers can supply a crafted VVC (H.266) file with a very large number of NAL units per access unit to trigger heap out-of-bounds writes and corrupt memory.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
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CVE-2026-125211

FFmpeg through 9.0.2 Heap Corruption via libaribcaption ASS Error Cleanup

FFmpeg through 9.0.2 contains an out-of-bounds read and invalid free vulnerability in aribcaption_trans_ass_subtitle() in libavcodec/libaribcaption.c that frees subtitle rectangles using region_count instead of num_rects. Attackers can supply crafted ARIB captions whose later region exceeds the 8 KiB AVBPrint limit, triggering cleanup that frees out-of-bounds pointers and corrupts the heap.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125203

FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow in Cook Multichannel Decoder

FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap buffer overflow vulnerability in the Cook multichannel decoder in libavcodec/cook.c that fails to verify subpacket channel masks are disjoint. Attackers can supply a crafted RealMedia Cook stream with overlapping subpacket masks, causing cook_decode_frame() to write decoded samples beyond allocated output planes in any application decoding the file.

CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125195

FFmpeg through 9.0.2 Uninitialized Memory Disclosure via ADPCM_MS Trellis Encoding

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in adpcm_encode_frame() in libavcodec/adpcmenc.c that leaks heap bytes when encoding mono ADPCM_MS audio with trellis enabled. Attackers submitting audio to a service using this encoding receive output packets where about half of each block contains stale heap memory from the encoding process.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125179

FFmpeg through 9.0.2 Heap Memory Disclosure via VQA Video Decoder

FFmpeg through 9.0.2 contains an uninitialized memory vulnerability in the VQA video decoder in libavcodec/vqavideo.c that allows attackers to disclose heap memory via a crafted VQA file. Attackers can supply a Westwood VQA file omitting or truncating the CBF0/CBFZ codebook chunk, causing vqa_decode_frame() to render frames from leftover heap bytes visible in decoded output.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125268

FFmpeg through 9.0.2 Uninitialized Heap Memory Disclosure in CFHD Decoder

FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in the CineForm HD decoder that allows attackers to leak heap memory via unzeroed idwt_tmp buffers in libavcodec/cfhd.c. Attackers can supply a crafted CFHD file with an ImageHeight tag exceeding coded band heights, causing uninitialized heap bytes to be filtered into decoded video output.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125260

FFmpeg through 9.0.2 Heap Buffer Overflow in EXR Encoder RLE Path

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/exrenc.c that allows attackers to corrupt heap memory when encode_scanline_rle() processes frames taller than the encoder height. Attackers can supply crafted input whose resolution grows mid-stream, transcoded to OpenEXR with RLE compression, to write pointers past the scanline array and crash the application.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125256

FFmpeg through 9.0.2 Heap Buffer Overflow via RISC-V Vector diff_bytes Routine

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in ff_llvidenc_diff_bytes_rvv() that allows attackers to corrupt heap memory by triggering negative length values in the Huffyuv encoder. Attackers can supply RGB video narrower than 8 or 16 pixels for huffyuv transcoding on RVV-enabled RISC-V builds, causing writes past the encoder's temp buffer.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125248

FFmpeg 9.0 through 9.0.2 Integer Overflow via FFV1 Vulkan Encoder Remap Buffer

FFmpeg 9.0 through 9.0.2 contains an integer overflow vulnerability in libavcodec/ffv1enc_vulkan.c that undersizes the float remap GPU buffer for large frames. Attackers can supply large GBRPF32 or GBRAPF32 images or videos that, when transcoded to FFV1 with the Vulkan encoder, trigger out-of-bounds GPU memory writes causing crashes or memory corruption.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125204

FFmpeg through 9.0.2 Heap Buffer Overflow in libwebp Encoder Conditional Replenishment

FFmpeg through 9.0.2 contains a heap buffer overflow in ff_libwebp_get_frame() in libwebpenc_common.c that lets attackers corrupt memory when cr_threshold is set. Attackers can supply crafted media that increases resolution mid-stream, causing memcpy() to write pixel data past the stale reference frame and crash applications.

CVSS 4.0 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg
CVE-2026-125192

FFmpeg through 9.0.2 Heap Memory Disclosure via DXA Decoder Uninitialized Buffer

FFmpeg through 9.0.2 contains an uninitialized memory vulnerability in the DXA decoder in libavcodec/dxa.c that allows attackers to disclose heap memory via crafted DXA files. Attackers can supply a DXA video with a type 4 frame that copies the uninitialized decomp_buf buffer into output pictures, exposing leftover heap contents in decoded frames.

CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Ffmpeg
Products
Ffmpeg