How severe is CVE-2026-61908?

CVE-2026-61908 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-61908 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-61908?

CVE-2026-61908 affects Cyrus Imap. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-61908?

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

When was CVE-2026-61908 published?

CVE-2026-61908 was published on 2026-09-09 and last updated on 2026-09-16.

CVE-2026-61908

CVE-2026-61908 is a low-severity vulnerability in Cyrus Imap with a CVSS 3.x base score of 3.1. 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: Low (CVSS 3.x base score 3.1)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Cyrus Imap
Published: 2026-09-09
Last modified: 2026-09-16

Description

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.

Frequently asked questions

What is CVE-2026-61908?: An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.
How severe is CVE-2026-61908?: CVE-2026-61908 has a CVSS 3.x base score of 3.1, rated low severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-61908 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-61908?: CVE-2026-61908 affects Cyrus Imap. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-61908?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-61908 published?: CVE-2026-61908 was published on 2026-09-09 and last updated on 2026-09-16.

References

Affected products (1)

cpe:2.3:a:cyrus:imap:*:*:*:*:*:*:*:*

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