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Fencer Vulns
low 3.1

CVE-2026-61908 json

An issue was discovered in Cyrus IMAP before 3.12.4.

published 2026-09-09 2 mo ago modified 2026-09-16 53 d ago also EUVD-2026-75134

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • cyrusimap Cyrus IMAP 3.8.8, 3.10.4, 3.12.4
  • cyrus-imapd Debian 14 3.12.4-1

debian advisories DEBIAN-CVE-2026-61908

  • cyrus-imapd openSUSE Leap 16.0 3.8.8-bp160.1.1

opensuse advisories openSUSE-SU-2026:21929-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-61908 updated cvss 4.3

cyrus-imapd: cyrus-imapd: JMAP email-header blob ID out-of-bounds index

  • Red Hat Enterprise Linux 6 cyrus-imapd, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 8 cyrus-imapd, cyrus-imapd-vzic, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 9 perl-Cyrus, cyrus-imapd, cyrus-imapd-libs, cyrus-imapd-utils, cyrus-imapd 3.8.3-10.el10 Red Hat Enterprise Linux 10 cyrus-imapd 3.8.3-10.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
59 d ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • cyrusimap Cyrus IMAP

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.