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CVE-2026-25961

SumatraPDF is a multi-format reader for Windows. In 3.5.0 through 3.5.2, SumatraPDF's update mechanism disables TLS hostname verification (INTERNET_FLAG_IGNORE_CERT_CN_INVALID) and executes installers without signature checks. A network attacker with any valid TLS certificate (e.g., Let's Encrypt) can intercept the update check request, inject a malicious installer URL, and achieve arbitrary code execution.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6ef2ea299a1b0f7fb6a8403953e70c063f1cd4a6e4c5300b43c0489ab0b69e70
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-494","description":"CWE-494: Download of Code Without Integrity Check","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"sumatrapdf","vendor":"sumatrapdfreader","versions":[{"status":"affected","version":">= 3.5.0, <= 3.5.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-494","description":"CWE-494: Download of Code Without Integrity Check","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-xpm2-rr5m-x96q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-xpm2-rr5m-x96q"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c78b87855224752e78f6254d8e5a8b674a7d99b4dfcb4a6881ab1e57392f24bb · sha256:fc01dec134f3702b… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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