CVE-2026-3777 [Medium] | Use-After-Free in Pdf Editor

The application does not properly validate the lifetime and validity of internal view cache pointers after JavaScript changes the document zoom and page state. When a script modifies the zoom property and then triggers a page change, the original view object may be destroyed while stale pointers are still kept and later dereferenced, which under crafted JavaScript and document structures can lead to a use-after-free condition and potentially allow arbitrary code execution.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-01	—	0.01%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-01

—

0.01%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	3.6	14984358-7092-470d-8f34-ade47a7658a2
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

3.6

14984358-7092-470d-8f34-ade47a7658a2

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

Affected software / configurations for CVE-2026-3777

Vendor	Product	Version	Raw CPE
foxit	pdf_editor	<= 13.2.2.24014	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 14.0.0.33046, <= 14.0.2.33402	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2023.1.0.15510, <= 2023.3.0.23028	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2024.1.0.23997, <= 2024.4.1.27687	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2025.1.0.27937, <= 2025.3.0.35737	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_reader	<= 2025.3.0.35737	cpe:2.3:a:foxit:pdf_reader::::::::
foxit	pdf_editor	<= 13.2.2.63349	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 14.0.0.68868, <= 14.0.2.69164	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2023.1.0.55583, <= 2023.3.0.63083	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2024.1.0.63682, <= 2024.4.1.66479	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_editor	>= 2025.1.0.66692, <= 2025.3.0.69570	cpe:2.3:a:foxit:pdf_editor::::::::
foxit	pdf_reader	<= 2025.3.0.69570	cpe:2.3:a:foxit:pdf_reader::::::::

References for CVE-2026-3777

URL	Tags
https://www.foxit.com/support/security-bulletins.html	Vendor Advisory

URL

CVE-2026-3777 | Use after free of view cache in Foxit PDF Editor/Reader

Exploit prediction scoring system (EPSS) score for CVE-2026-3777

Common vulnerability scoring system (CVSS) metrics for CVE-2026-3777

Weakness enumeration for CVE-2026-3777

Affected software / configurations for CVE-2026-3777

References for CVE-2026-3777