143 lines
6.1 KiB
JSON
143 lines
6.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-33020",
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"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"state": "PUBLISHED",
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"assignerShortName": "GitHub_M",
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"dateReserved": "2026-03-17T17:22:14.667Z",
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"datePublished": "2026-04-14T21:53:00.388Z",
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"dateUpdated": "2026-04-15T13:30:47.463Z"
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},
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"containers": {
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"cna": {
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"title": "libsixel: Integer Overflow in write_png_to_file() leads to Heap-based Buffer Overflow",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-122",
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"lang": "en",
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"description": "CWE-122: Heap-based Buffer Overflow",
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"type": "CWE"
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}
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]
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},
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{
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"descriptions": [
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{
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"cweId": "CWE-190",
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"lang": "en",
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"description": "CWE-190: Integer Overflow or Wraparound",
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"type": "CWE"
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}
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]
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"attackComplexity": "LOW",
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"attackVector": "LOCAL",
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"availabilityImpact": "HIGH",
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"baseScore": 7.1,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "NONE",
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"integrityImpact": "HIGH",
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"privilegesRequired": "NONE",
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"scope": "UNCHANGED",
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"userInteraction": "REQUIRED",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
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"version": "3.1"
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}
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}
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],
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"references": [
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{
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"name": "https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p",
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"tags": [
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"x_refsource_CONFIRM"
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],
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"url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p"
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},
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{
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"name": "https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1",
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"tags": [
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"x_refsource_MISC"
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],
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"url": "https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1"
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}
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],
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"affected": [
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{
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"vendor": "saitoha",
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"product": "libsixel",
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"versions": [
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{
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"version": "< 1.8.7-r1",
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"status": "affected"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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"shortName": "GitHub_M",
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"dateUpdated": "2026-04-14T21:53:00.388Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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 buffer overflow via sixel_frame_convert_to_rgb888() in frame.c, where allocation size and pointer offset computations for palettised images (PAL1, PAL2, PAL4) are performed using int arithmetic before casting to size_t. For images whose pixel count exceeds INT_MAX / 4, the overflow produces an undersized heap allocation for the conversion buffer and a negative pointer offset for the normalization sub-buffer, after which sixel_helper_normalize_pixelformat() writes the full image data starting from the invalid pointer, causing massive heap corruption confirmed by ASAN. An attacker providing a specially crafted large palettised PNG can corrupt the heap of the victim process, resulting in a reliable crash and potential arbitrary code execution.\nThis issue has been fixed in version 1.8.7-r1."
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}
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],
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"source": {
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"advisory": "GHSA-2xgm-4x47-2x2p",
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"discovery": "UNKNOWN"
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}
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},
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"adp": [
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{
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"references": [
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{
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"url": "https://github.com/saitoha/libsixel/security/advisories/GHSA-2xgm-4x47-2x2p",
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"tags": [
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"exploit"
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]
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}
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],
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-04-15T13:30:43.489988Z",
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"id": "CVE-2026-33020",
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"options": [
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{
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"Exploitation": "poc"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-04-15T13:30:47.463Z"
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}
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}
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]
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}
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} |