CVE-2026-25961General(sumatrapdfreader / sumatrapdf)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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.

sumatrapdfreader CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Exploit / PoC references

https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-xpm2-rr5m-x96q

Weakness type (CWE)

CWE-295CWE-494

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

sumatrapdf

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
General: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

sumatrapdfreader

Products

sumatrapdf

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

General

1100.0%

Referenced assets2 URLs

By indicator

Full discourse1 post

Vulmon Vulnerability Feed@VulmonFeeds242d
General
CVE-2026-25961 SumatraPDF Update Mechanism Vulnerability Enables Arbitra... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-25961 Don't wait vulnerability scanning results: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=2
Post summary
The post briefly announces CVE-2026-25961, mentions it affects SumatraPDF’s update mechanism, and links to a vulnerability details page, but provides no further technical, exploit, or patch information.
00010106
4.0K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	sumatrapdfreader	sumatrapdf	-	-	-

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