{"id":"CVE-2026-2703","state":"PUBLISHED","title":"xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one","description":"A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue.","publishedAt":"2026-02-19T04:02:10.794Z","updatedAt":"2026-02-24T01:40:43.838Z","severity":{"score":4.8,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","source":"VulDB"},"assigner":"VulDB","products":["xlnt-community xlnt"],"affected":[{"vendor":"xlnt-community","product":"xlnt","versions":[{"version":"1.6.0","status":"affected"},{"version":"1.6.1","status":"affected"}],"modules":["Encrypted XLSX File Parser"]}],"references":["https://vuldb.com/?id.346649","https://vuldb.com/?ctiid.346649","https://vuldb.com/?submit.754377","https://github.com/xlnt-community/xlnt/issues/137","https://github.com/oneafter/0128/blob/main/xl1/repro","https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734","https://github.com/xlnt-community/xlnt/"],"weaknesses":["CWE-193","CWE-189"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/2xxx/CVE-2026-2703.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-2703","state":"PUBLISHED","datePublished":"2026-02-19T04:02:10.794Z","dateUpdated":"2026-02-24T01:40:43.838Z","assignerShortName":"VulDB","assignerOrgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateReserved":"2026-02-18T17:59:02.756Z"},"containers":{"cna":{"title":"xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one","descriptions":[{"lang":"en","value":"A weakness has been identified in xlnt-community xlnt up to 1.6.1. Impacted is the function xlnt::detail::decode_base64 of the file source/detail/cryptography/base64.cpp of the component Encrypted XLSX File Parser. Executing a manipulation can lead to off-by-one. The attack requires local access. The exploit has been made available to the public and could be used for attacks. This patch is called f2d7bf494e5c52706843cf7eb9892821bffb0734. Applying a patch is advised to resolve this issue."}],"affected":[{"vendor":"xlnt-community","product":"xlnt","versions":[{"version":"1.6.0","status":"affected"},{"version":"1.6.1","status":"affected"}],"modules":["Encrypted XLSX File Parser"]}],"references":[{"url":"https://vuldb.com/?id.346649","name":"VDB-346649 | xlnt-community xlnt Encrypted XLSX File base64.cpp decode_base64 off-by-one","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/?ctiid.346649","name":"VDB-346649 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/?submit.754377","name":"Submit #754377 | xlnt-community xlnt  5606f5b Heap-based Buffer Overflow","tags":["third-party-advisory"]},{"url":"https://github.com/xlnt-community/xlnt/issues/137","tags":["issue-tracking"]},{"url":"https://github.com/oneafter/0128/blob/main/xl1/repro","tags":["exploit"]},{"url":"https://github.com/xlnt-community/xlnt/commit/f2d7bf494e5c52706843cf7eb9892821bffb0734","tags":["patch"]},{"url":"https://github.com/xlnt-community/xlnt/","tags":["product"]}],"metrics":[{"cvssV4_0":{"version":"4.0","baseScore":4.8,"vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","baseSeverity":"MEDIUM"}},{"cvssV3_1":{"version":"3.1","baseScore":3.3,"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","baseSeverity":"LOW"}},{"cvssV3_0":{"version":"3.0","baseScore":3.3,"vectorString":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C","baseSeverity":"LOW"}},{"cvssV2_0":{"version":"2.0","baseScore":1.7,"vectorString":"AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:OF/RC:C"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-193","type":"CWE","lang":"en","description":"Off-by-One"}]},{"descriptions":[{"cweId":"CWE-189","type":"CWE","lang":"en","description":"Numeric Error"}]}],"providerMetadata":{"shortName":"VulDB","orgId":"1af790b2-7ee1-4545-860a-a788eba489b5","dateUpdated":"2026-02-23T10:28:34.926Z"},"timeline":[{"time":"2026-02-18T00:00:00.000Z","lang":"en","value":"Advisory disclosed"},{"time":"2026-02-18T01:00:00.000Z","lang":"en","value":"VulDB entry created"},{"time":"2026-02-18T19:04:11.000Z","lang":"en","value":"VulDB entry last update"}],"credits":[{"lang":"en","value":"Oneafter (VulDB User)","type":"reporter"}],"tags":["x_open-source"]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-24T01:40:32.932647Z","id":"CVE-2026-2703","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":"2026-02-24T01:40:43.838Z"}}]}}}