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Fencer Vulns
medium 6.1

CVE-2026-18495 json

Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough

published 2026-09-11 58 d ago modified 2026-11-05 3 d ago also EUVD-2026-76166

cvss
6.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

A flaw was found in libtiff. A heap-buffer overflow vulnerability exists in the `tiff2pdf` utility due to an integer truncation error when processing crafted BigTIFF files. An attacker can provide a specially crafted BigTIFF file, causing a 64-bit `StripByteCounts` value to be truncated to a 32-bit integer. This leads to an undersized memory allocation and a subsequent out-of-bounds memory copy, resulting in a crash and severe memory corruption.

Patch / fix

  • Red Hat Red Hat Hardened Images 4.7.2-2.hum1
  • tiff Debian 14 4.7.1-1

debian advisories DEBIAN-CVE-2026-18495

  • libtiff hummingbird 1 4.7.2-2.hum1
  • libtiff-tools hummingbird 1 4.7.2-2.hum1

red hat advisories RHSA-2026:53467

  • tiff SLE Module for Basesystem 15 SP7, SLE Micro 5.5, SLE Micro 5.4 +1 more 4.0.9-150000.45.72.1
  • tiff SLES LTSS Extended Security 12 SP5 4.0.9-44.118.1

suse advisories SUSE-SU-2026:4845-1SUSE-SU-2026:4252-1

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-2026-18495 updated cvss 6.1

libtiff: libtiff: heap-buffer overflow via numeric truncation in the JPEG raw passthrough

  • Red Hat Enterprise Linux 6 libtiff
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libtiff, libtiff-tools, compat-libtiff3 Red Hat Enterprise Linux 8 libtiff, libtiff-tools, mingw-libtiff, compat-libtiff3, mingw32-libtiff, mingw64-libtiff Red Hat Enterprise Linux 9 libtiff, libtiff-tools Red Hat Enterprise Linux 10 libtiff
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images libtiff 4.7.2-2.hum1, libtiff-tools 4.7.2-2.hum1
    fixed: vendor fix RHSA-2026:53467
  • Red Hat Ceph Storage 4 ceph, librbd1, librgw2, rbd-nbd, ceph-mds, ceph-mgr, +27 more Red Hat Ceph Storage 6 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 7 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +16 more Red Hat Ceph Storage 8 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +17 more Red Hat Ceph Storage 9 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mib, +17 more Red Hat Enterprise Linux 9 boost, librbd1, boost-b2, boost-log, librados2, boost-json, +36 more
    +1 more products
    Red Hat Enterprise Linux 10 ceph, boost
    not affected: vulnerable code not present
  • Red Hat Hardened Images boost
    not affected: component not present

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
58 d ago

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Ceph Storage 4
  • Red Hat Red Hat Ceph Storage 6
  • Red Hat Red Hat Ceph Storage 7
  • Red Hat Red Hat Ceph Storage 8
  • Red Hat Red Hat Ceph Storage 9
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

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.