CVE-2026-112056 wvWare CVE debrief

Who should care

Defenders responsible for applications that process Word stylesheets, especially those using wvWare wv library, should assess exposure and prioritize patching or mitigation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review affected product deployments, apply patches, and monitor for potential impacts. They should also review compensating controls for exposed systems and track exceptions

Why it matters

Defenders should care about CVE-2026-112056 because it affects wvWare wv library, potentially causing application crashes or instability when processing crafted Word stylesheets. This vulnerability requires verification of affected versions, application of patches, and monitoring for potential impacts on document processing workflows.

• Potential application crashes or instability due to out-of-bounds reads
• Need for verification of affected versions and application of patches
• Possible impact on document processing workflows or services
• Requirement for monitoring and incident response planning

Technical summary

The wvWare wv library through version 1.2.9 contains a heap-based out-of-bounds read vulnerability in the wvGetSTSH function within stylesheet.c. This vulnerability can be exploited by providing crafted Word stylesheets, potentially causing applications like AbiWord to crash. The vulnerability requires verification of affected versions, application of patches, and monitoring for potential impacts on document processing workflows. The affected product deployments should be reviewed for exposure, and patches should be applied or mitigations planned through normal change control.

Defensive priority

Defenders should prioritize verifying and applying patches for wvWare wv through 1.2.9, especially in applications that process Word stylesheets.

Recommended defensive actions

• Verify and apply patches for wvWare wv through 1.2.9
• Review and update applications that process Word stylesheets to handle crafted inputs
• Monitor for and respond to potential crashes or instability in affected applications
• Perform a thorough review of affected product deployments in managed environments
• Confirm whether compensating controls are in place for exposed systems
• Track exceptions and retest remediated assets
• Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on a heap-based out-of-bounds read vulnerability in wvGetSTSH in stylesheet.c. The vulnerability allows attackers to crash applications by supplying crafted Word stylesheets.

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.