CVE-2026-81977: acrobat Integer Underflow — Fix

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.

Is your site exposed to CVE-2026-81977?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

5.5

MEDIUM

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

EPSS — Exploit Prediction

0.0017

Probability of exploitation

0.07%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-191 CWE-191

Affected Products

Vendor	Product	Versions
adobe	acrobat	24.001.20604 — 24.001.30429
adobe	acrobat_dc	15.008.20082 — 26.002.21901
adobe	acrobat_reader_dc	15.008.20082 — 26.002.21901
apple	macos	All
microsoft	windows	All

References

Advisories & Patches

https://helpx.adobe.com/security/products/acrobat/apsb26-141.html

Frequently Asked Questions

What is CVE-2026-81977? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-81977? +

CVE-2026-81977 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0017, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-81977? +

CVE-2026-81977 affects products from adobe, apple, microsoft, specifically: acrobat, acrobat_dc, acrobat_reader_dc, macos, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-81977? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-59368

An integer underflow vulnerability has been identified in Aicloud. An authenticated attacker may trigger this vulnerability by sending a crafted …

CVE-2025-65092

ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.5.1, 5.4.3, and 5.3.4, when the ESP32-P4 uses …

CVE-2026-43916

pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a …

CVE-2026-30803

Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers.This issue affects Connext Micro: from …

CVE-2026-71401

An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that …

CVE-2026-54345

gopacket provides packet processing capabilities for Go. In version 1.6.0 and earlier, the Diameter AVP decoder computes an AVP data …

CVE-2026-81977