How severe is CVE-2026-41034?

CVE-2026-41034 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-41034 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-41034?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-41034 have an EU (EUVD) identifier?

Yes. CVE-2026-41034 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23199.

When was CVE-2026-41034 published?

CVE-2026-41034 was published on 2026-04-16 and last updated on 2026-06-17.

CVE-2026-41034

CVE-2026-41034 is a medium-severity vulnerability with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23199
Weakness: CWE-125
Published: 2026-04-16
Last modified: 2026-06-17

Description

ONLYOFFICE DocumentServer before 9.3.0 has an untrusted pointer dereference in XLS processing/conversion (via pictFmla.cbBufInCtlStm and other vectors), leading to an information leak and ASLR bypass.

Frequently asked questions

What is CVE-2026-41034?: ONLYOFFICE DocumentServer before 9.3.0 has an untrusted pointer dereference in XLS processing/conversion (via pictFmla.cbBufInCtlStm and other vectors), leading to an information leak and ASLR bypass.
How severe is CVE-2026-41034?: CVE-2026-41034 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-41034 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-41034?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-41034 have an EU (EUVD) identifier?: Yes. CVE-2026-41034 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23199.
When was CVE-2026-41034 published?: CVE-2026-41034 was published on 2026-04-16 and last updated on 2026-06-17.

References

https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md

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