{"id":"CVE-2026-62250","state":"PUBLISHED","title":"LibreDWG: unbounded allocation in pre-R13 DWG entity decoding","description":"LibreDWG is a free C library to read and write DWG files. Prior to 0.14.8413, a crafted pre-R13 DWG can make `decode_preR13_entities()` in `src/decode.c` enter a nonterminating loop that allocates a new object each iteration. `decode_preR13` in `src/decode_r11.c` computes `size` from the raw file-controlled `entities_start` and `entities_end` header bounds; the callee clamps `end` to `dat->size` but never recalculates `size`. At `end` of input, `bit_read_RC` and `bit_read_RS` stop advancing `dat->byte`, the overflow guard fails because `end` equals `dat->size`, and the no-advance check compares against `oldpos` saved before the loop instead of the previous iteration. This leaves repeated allocation of `dwg->object` entries until allocation fails or the process is OOM-killed, not merely a constant-memory CPU hang. The defect remains after the clamping and no-progress changes associated with the earlier issue 1131. Applications and tools calling `dwg_read_file()` on untrusted files, including `dwg2dxf`, `dwgread` and `dwg2svg`, can suffer denial of service when a user or automated pipeline opens a malformed file; no attacker credentials are required. This issue is fixed in repository nightly version 0.14.8413.","publishedAt":"2026-10-30T20:37:47.927Z","updatedAt":"2026-10-30T22:12:48.952Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["LibreDWG libredwg"],"affected":[{"vendor":"LibreDWG","product":"libredwg","versions":[{"version":"< 0.14.8413","status":"affected"}]}],"references":["https://github.com/LibreDWG/libredwg/security/advisories/GHSA-7625-26gc-xqvp","https://github.com/LibreDWG/libredwg/issues/1131","https://github.com/LibreDWG/libredwg/commit/4e14952c43be5b8feff6e54a61af3425d6ca95a4","https://github.com/LibreDWG/libredwg/releases/tag/0.14.8413"],"weaknesses":["CWE-835","CWE-400"],"ingestedAt":"2026-10-30T22:16:06.501Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62250.json","commit":"226652b7321cd45ef01add6f464a8114b52515e5","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62250","state":"PUBLISHED","datePublished":"2026-10-30T20:37:47.927Z","dateUpdated":"2026-10-30T22:12:48.952Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-13T17:09:57.573Z"},"containers":{"cna":{"title":"LibreDWG: unbounded allocation in pre-R13 DWG entity decoding","descriptions":[{"lang":"en","value":"LibreDWG is a free C library to read and write DWG files. Prior to 0.14.8413, a crafted pre-R13 DWG can make `decode_preR13_entities()` in `src/decode.c` enter a nonterminating loop that allocates a new object each iteration. `decode_preR13` in `src/decode_r11.c` computes `size` from the raw file-controlled `entities_start` and `entities_end` header bounds; the callee clamps `end` to `dat->size` but never recalculates `size`. At `end` of input, `bit_read_RC` and `bit_read_RS` stop advancing `dat->byte`, the overflow guard fails because `end` equals `dat->size`, and the no-advance check compares against `oldpos` saved before the loop instead of the previous iteration. This leaves repeated allocation of `dwg->object` entries until allocation fails or the process is OOM-killed, not merely a constant-memory CPU hang. The defect remains after the clamping and no-progress changes associated with the earlier issue 1131. Applications and tools calling `dwg_read_file()` on untrusted files, including `dwg2dxf`, `dwgread` and `dwg2svg`, can suffer denial of service when a user or automated pipeline opens a malformed file; no attacker credentials are required. This issue is fixed in repository nightly version 0.14.8413."}],"affected":[{"vendor":"LibreDWG","product":"libredwg","versions":[{"version":"< 0.14.8413","status":"affected"}]}],"references":[{"url":"https://github.com/LibreDWG/libredwg/security/advisories/GHSA-7625-26gc-xqvp","name":"https://github.com/LibreDWG/libredwg/security/advisories/GHSA-7625-26gc-xqvp","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/LibreDWG/libredwg/issues/1131","name":"https://github.com/LibreDWG/libredwg/issues/1131","tags":["x_refsource_MISC"]},{"url":"https://github.com/LibreDWG/libredwg/commit/4e14952c43be5b8feff6e54a61af3425d6ca95a4","name":"https://github.com/LibreDWG/libredwg/commit/4e14952c43be5b8feff6e54a61af3425d6ca95a4","tags":["x_refsource_MISC"]},{"url":"https://github.com/LibreDWG/libredwg/releases/tag/0.14.8413","name":"https://github.com/LibreDWG/libredwg/releases/tag/0.14.8413","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-835","lang":"en","description":"CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-30T20:37:47.927Z"},"source":{"advisory":"GHSA-7625-26gc-xqvp","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T21:18:21.594623Z","id":"CVE-2026-62250","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-30T22:12:48.952Z"}}]}}}