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NVD / CVE Program· CNA redhat

CVE-2026-18495: Libtiff: libtiff: heap-buffer overflow via numeric truncation in the jpeg raw passthrough

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: tiff (Debian:14) 4.7.1-1; libtiff (Red Hat:hummingbird:1) 0:4.7.2-2.hum1; libtiff-devel (Red Hat:hummingbird:1) 0:4.7.2-2.hum1.

Low priority for now. Upgrade to tiff (Debian:14) 4.7.1-1; libtiff (Red Hat:hummingbird:1) 0:4.7.2-2.hum1; libtiff-devel (Red Hat:hummingbird:1) 0:4.7.2-2.hum1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.1 · v3.1—No exploit Fix available
Published
Sep 11, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
6.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-18495

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Ceph Storage 4

    • all versionsunknown

  • Red Hat Red Hat Ceph Storage 6

    • all versionsunknown

  • Red Hat Red Hat Ceph Storage 7

    • all versionsunknown

  • Red Hat Red Hat Ceph Storage 8

    • all versionsunknown

  • Red Hat Red Hat Ceph Storage 9

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown
    • all versionsunknown
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected
    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsunknown
    • all versionsunknown
    • all versionsaffected

  • Red Hat Red Hat Hardened Images

    • 4.7.2-2.hum1 and laternot affected · rpm
    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12tifffrom 0—
Debian:14tiffbefore 4.7.1-14.7.1-1
Red Hat:hummingbird:1libtiffbefore 0:4.7.2-2.hum10:4.7.2-2.hum1
Red Hat:hummingbird:1libtiff-develbefore 0:4.7.2-2.hum10:4.7.2-2.hum1
Red Hat:hummingbird:1libtiff-staticbefore 0:4.7.2-2.hum10:4.7.2-2.hum1
Red Hat:hummingbird:1libtiff-toolsbefore 0:4.7.2-2.hum10:4.7.2-2.hum1
SUSE:Linux Enterprise Micro 5.3tiffbefore 4.0.9-150000.45.72.14.0.9-150000.45.72.1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5tiffbefore 4.0.9-44.118.14.0.9-44.118.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-90954Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
    31Monitor
  • CVE-2026-96512Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization
    31Monitor
  • CVE-2026-78410Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-87875Sep 9, 2026 · Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-length bound
    17Monitor
  • ← EarlierCVE-2026-87876Sep 9, 2026 · Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
    12Monitor
  • Later →CVE-2026-85013Sep 15, 2026 · Environment-modules: command injection in environment-modules bash completion via malicious module names containing shell metacharacters
    29Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:tiff4.7.1-1 · Debian:14Package registry (OSV)
red hat:libtiff0:4.7.2-2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libtiff-devel0:4.7.2-2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libtiff-static0:4.7.2-2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libtiff-tools0:4.7.2-2.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:tiff4.0.9-44.118.1 · SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records