CVE-2026-81977

Analyzed Analyzed - Analysis Complete

Integer Underflow in Acrobat Reader Leads to Memory Disclosure

Publication date: 2026-09-08

Last updated on: 2026-09-11

Assigner: Adobe Systems Incorporated

Description

Acrobat Reader is affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to disclose sensitive information. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-11

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-81977

Affected Vendors & Products

Vendor	Product	Version / Range
adobe	acrobat_dc	From 15.008.20082 (inc) to 26.002.21901 (exc)
adobe	acrobat_reader_dc	From 15.008.20082 (inc) to 26.002.21901 (exc)
adobe	acrobat	From 24.001.20604 (inc) to 24.001.30429 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This is an Integer Underflow (Wrap or Wraparound) vulnerability in Acrobat Reader that could allow disclosure of sensitive memory. An attacker would need to trick a user into opening a malicious file to exploit it.

Detection Guidance

This vulnerability requires user interaction to exploit, so detection primarily involves monitoring for suspicious PDF files or unusual memory access patterns. Check for recently opened PDFs from untrusted sources. Use system logs to identify unexpected memory disclosures or crashes in Acrobat Reader processes.

Impact Analysis

If exploited, this vulnerability could allow an attacker to access sensitive information stored in memory on your system. This might include passwords, encryption keys, or other confidential data.

Mitigation Strategies

Update Acrobat Reader to the latest version immediately. Disable PDF opening in web browsers or email clients if possible. Restrict user permissions to limit access to sensitive memory. Avoid opening PDF files from unknown or untrusted sources until patched.

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