{"id":"CVE-2026-107734","title":"SumatraPDF is a multi-format reader for Windows","summary":"SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, an attacker-controlled SyncTeX source filename is substituted for the %f placeholder in an external editor command line without safe Windows argument quoting, and the…","severity":"high","cwe":["CWE-20","CWE-88"],"published":"2026-10-08","updated":"2026-10-09","sourceUpdated":"2026-10-09T16:17:24.383","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107734","references":[{"url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/398d23624362c60722d9709173a287ea53545b3b","label":"security-advisories@github.com"},{"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2","label":"security-advisories@github.com"},{"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-jf4v-rw66-j4w2","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"ingestedAt":"2026-10-09T00:19:50.971Z","epss":0.002,"epssPercentile":0.09703,"vendor":"sumatrapdfreader","product":"sumatrapdf","affected":["sumatrapdf <= 3.5.2"],"cvss":7.1,"cvssVector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-10-09T15:44:08.862536Z"},"cvssSource":"cna","slug":"CVE-2026-107734","body":"## Overview\n\nSumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, an attacker-controlled SyncTeX source filename is substituted for the %f placeholder in an external editor command line without safe Windows argument quoting, and the resulting command line is passed to CreateProcessW(). A user with an external editor configured or auto-detected who opens a PDF with a crafted .synctex.gz file and invokes inverse search can inject command-line flags; the resulting impact depends on the target editor interpreting those flags and can include unintended editor actions or code execution through a malicious extension. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":220589,"id":"CVE-2026-107734","ts":1792022821608,"field":"exploit_available","old":"false","new":"true"},{"seq":220588,"id":"CVE-2026-107734","ts":1792022821608,"field":"cvss","old":null,"new":"7.1"},{"seq":220587,"id":"CVE-2026-107734","ts":1792022821608,"field":"severity","old":"none","new":"high"}]}