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PatchSiren cyber security CVE debrief

CVE-2026-34707 Adobe CVE debrief

A Heap-based Buffer Overflow vulnerability was discovered in Adobe InCopy versions 21.3, 20.5.3 and earlier. This vulnerability, tracked as CVE-2026-34707, could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction, as a victim must open a malicious file. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Vendor
Adobe
Product
InCopy
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-08-28
Advisory published
2026-06-09
Advisory updated
2026-08-28

Who should care

Users of Adobe InCopy versions 21.3, 20.5.3 and earlier should apply the necessary patches to prevent potential exploitation of this vulnerability.

Technical summary

The vulnerability is caused by a Heap-based Buffer Overflow in Adobe InCopy. This type of vulnerability occurs when more data is written to a buffer than it is designed to hold, causing the extra data to spill over into adjacent areas of memory. In this case, the vulnerability could allow an attacker to execute arbitrary code in the context of the current user.

Defensive priority

High

Recommended defensive actions

  • Apply the patches provided by Adobe to fix the vulnerability.
  • Ensure that users are aware of the risks associated with opening malicious files.

Evidence notes

The vulnerability was reported by Adobe and is tracked as CVE-2026-34707. The CVSS score is 7.8, indicating a HIGH severity vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-34707 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-34707

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-34707 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-34707

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.