CVE-2026-107705 freedesktop CVE debrief

Who should care

Defenders responsible for systems and applications using Poppler, libpoppler, libpoppler-glib, or the C++ API should assess exposure and prioritize verification and updates to prevent potential impacts.

Why it matters

CVE-2026-107705 is a high-severity vulnerability in Poppler that allows attackers to cause a stack-based buffer overflow by providing specially crafted passwords for encrypted PDFs. Defenders should prioritize verifying and updating Poppler, assessing exposure in applications using the vulnerable library, and monitoring for suspicious activity.

• Potential process crashes or memory corruption when processing malicious PDFs
• Possible data integrity issues or denial of service due to memory corruption
• Need for verification and updates to prevent exposure
• Potential for attackers to exploit this vulnerability in targeted attacks

Technical summary

The vulnerability exists in the Decrypt::revision6Hash() function of Poppler 0.42.0 through 26.10.0. By providing a password longer than 127 bytes for AESV3/R6 encrypted PDFs, attackers can cause a stack-based buffer overflow, potentially leading to a process crash or memory corruption. The vulnerability affects applications using libpoppler, libpoppler-glib, or the C++ API. Defenders should prioritize verifying and updating Poppler to a secure version, assessing exposure in applications using the vulnerable library, and monitoring for suspicious PDF processing activity. The vulnerability has a CVSS score of 8.3 and is considered high severity.

Defensive priority

Defenders should prioritize verifying and updating Poppler to a secure version, assessing exposure in applications using libpoppler, libpoppler-glib, or the C++ API, and monitoring for suspicious PDF processing activity.

Recommended defensive actions

• Verify and update Poppler to a secure version
• Assess exposure in applications using libpoppler, libpoppler-glib, or the C++ API
• Monitor for suspicious PDF processing activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability, including its existence in Poppler 0.42.0 through 26.10.0, the affected functions, and potential impact. However, there is limited information on actual exploitation, victims, or specific business impacts.

Sources and 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.