166 lines
7.6 KiB
JSON
166 lines
7.6 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-2026-77658",
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"assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
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"state": "PUBLISHED",
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"assignerShortName": "fedora",
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"dateReserved": "2026-08-21T04:33:45.481Z",
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"datePublished": "2026-08-26T12:10:07.556Z",
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"dateUpdated": "2026-08-26T13:11:12.732Z"
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},
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"containers": {
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"cna": {
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"title": "Dia: dia: stack buffer overflow in bus object via unvalidated handle count in project files",
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"metrics": [
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{
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"other": {
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"content": {
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"value": "Important",
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"namespace": "https://access.redhat.com/security/updates/classification/"
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},
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"type": "Red Hat severity rating"
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}
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},
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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": 7.8,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "HIGH",
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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:H/I:H/A:H",
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"version": "3.1"
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},
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"format": "CVSS"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "A stack-based buffer overflow vulnerability exists in the Dia diagram editor when processing Network Bus objects from Dia XML project files.\n\nIn objects/network/bus.c, bus_load() reads the number of bus handles from the file attribute \"bus_handles\" using attribute_num_data() without validating an upper bound:\n\n bus->num_handles = attribute_num_data(attr);\n\nWhen a bus handle is subsequently moved, bus_handle_moved() allocates two temporary arrays on the stack:\n\n parallel = (real *)g_alloca(num_handles * sizeof(real));\n perp = (real *)g_alloca(num_handles * sizeof(real));\n\nBecause num_handles is fully attacker-controlled via the project file, sufficiently large values (for example 262144 or higher) cause g_alloca() to consume more stack space than the default thread stack limit (typically 8 MB on Linux), resulting in stack overflow, SIGSEGV, and potential stack frame / return-address corruption.\n\nAn attacker can embed a Bus object with an excessive bus_handles count in a malicious .dia file. Exploitation requires the victim to open the file in Dia (file dialog, command line, or file association) and trigger handle manipulation (moving a bus handle), which exercises the vulnerable code path.\n\nThe identical g_alloca pattern is present in objects/Misc/tree.c (copied from bus.c) and is likely vulnerable to the same class of attack via Tree objects.\n\nAffected versions: Dia 0.98.0 and earlier versions containing this code; issue confirmed on upstream master as of 2026-08-21.\nUpstream report: https://gitlab.gnome.org/GNOME/dia/-/issues/581"
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}
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],
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"affected": [
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{
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"vendor": "GNOME",
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"product": "Dia",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThanOrEqual": "0.98.0",
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"versionType": "semver"
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}
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],
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"packageName": "dia",
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"collectionURL": "https://gitlab.gnome.org/GNOME/dia/-/issues/581",
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"defaultStatus": "unaffected"
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}
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],
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"references": [
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{
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"url": "https://access.redhat.com/security/cve/CVE-2026-77658",
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"tags": [
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"vdb-entry",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520890",
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"name": "RHBZ#2520890",
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"tags": [
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"issue-tracking",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://gitlab.gnome.org/GNOME/dia/-/blob/master/objects/network/bus.c"
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},
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{
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"url": "https://gitlab.gnome.org/GNOME/dia/-/issues/581"
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}
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],
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"datePublic": "2026-08-21T00:00:00.000Z",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-121",
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"description": "Stack-based Buffer Overflow",
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"lang": "en",
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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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"x_redhatCweChain": "CWE-121: Stack-based Buffer Overflow",
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"timeline": [
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{
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"lang": "en",
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"time": "2026-08-21T04:16:10.319Z",
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"value": "Reported to Red Hat."
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},
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{
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"lang": "en",
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"time": "2026-08-21T00:00:00.000Z",
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"value": "Made public."
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Red Hat would like to thank Robin \"drzobin\" Larsson for reporting this issue."
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}
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],
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"providerMetadata": {
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"orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
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"shortName": "fedora",
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"dateUpdated": "2026-08-26T12:35:08.070Z"
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},
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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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": "2026-08-26T13:09:44.563034Z",
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"id": "CVE-2026-77658",
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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": "2026-08-26T13:11:12.732Z"
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}
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}
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]
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}
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} |