CVE-2026-18495

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-11. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
27(Track)
EG Risk 27/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 16, 2026

Advisory Details (5)

Auto-updated Sep 11, 2026
Patch available. Sources: redhat.
generic

Files · 67fd283d276f09db54dc39b9ef7b979d4b45c4b1 · libtiff / libtiff · GitLab

https://gitlab.com/libtiff/libtiff/-/tree/67fd283d276f09db54dc39b9ef7b979d4b45c4b1
generic

Fixing MSVC compiler warnings in some tools. (!729) · Merge requests · libtiff / libtiff · GitLab

https://gitlab.com/libtiff/libtiff/-/merge_requests/729
redhat

2531414 – (CVE-2026-18495) CVE-2026-18495 libtiff: libtiff: heap-buffer overflow via numeric truncation in the JPEG raw passthrough

https://bugzilla.redhat.com/show_bug.cgi?id=2531414
redhat Patch Available

CVE-2026-18495 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18495
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:53467

Vendor Advisories for CVE-2026-18495(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatlibtiff-main-4.7.2-2.hum12026-08-11redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 33× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-20 02:20 UTCEG score recompute
  2. 2026-09-20 02:20 UTCVendor advisory
  3. 2026-09-20 02:20 UTCGHSA enrichment
  4. 2026-09-19 00:13 UTCEG score recompute
  5. 2026-09-19 00:13 UTCVendor advisory
  6. 2026-09-19 00:13 UTCGHSA enrichment
  7. 2026-09-18 19:27 UTCEPSS rescore
  8. 2026-09-17 22:06 UTCEG score recompute
  9. 2026-09-17 22:06 UTCVendor advisory
  10. 2026-09-17 22:06 UTCGHSA enrichment
  11. 2026-09-16 19:58 UTCEG score recompute
  12. 2026-09-16 19:58 UTCVendor advisory
  13. 2026-09-16 19:58 UTCGHSA enrichment
  14. 2026-09-16 14:07 UTCEPSS rescore
  15. 2026-09-16 05:14 UTCEPSS rescore
  16. 2026-09-16 03:04 UTCEG score recompute
  17. 2026-09-16 03:04 UTCVendor advisory
  18. 2026-09-16 03:04 UTCGHSA enrichment
  19. 2026-09-15 00:56 UTCVendor advisory
  20. 2026-09-15 00:56 UTCGHSA enrichment
  21. 2026-09-13 22:49 UTCEG score recompute
  22. 2026-09-13 22:49 UTCVendor advisory
  23. 2026-09-13 22:48 UTCGHSA enrichment
  24. 2026-09-13 16:46 UTCEPSS rescore
  25. 2026-09-12 20:41 UTCEG score recompute
Show 8 more
  1. 2026-09-12 20:41 UTCVendor advisory
  2. 2026-09-12 20:41 UTCGHSA enrichment
  3. 2026-09-12 15:00 UTCEPSS rescore
  4. 2026-09-11 18:34 UTCEG score recompute
  5. 2026-09-11 18:34 UTCGHSA enrichment
  6. 2026-09-11 18:04 UTCEG score recompute
  7. 2026-09-11 17:49 UTCEG score recompute
  8. 2026-09-11 17:48 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-18495?
CVE-2026-18495 is a medium vulnerability published on September 11, 2026. 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…
When was CVE-2026-18495 disclosed?
CVE-2026-18495 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18495 actively exploited?
CVE-2026-18495 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.1% of all scored CVEs.
What is the CVSS score of CVE-2026-18495?
CVE-2026-18495 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-18495?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18495, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18495

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