CVE-2026-52491

HIGHPre-NVD 8.48.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week
8.4EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue in libtiff 85f2ac8e0b01cb7db2bbecf4a3b891bdbef67938 allows an attacker to execute arbitrary code via the libtiff/tools/thumbnail.c: main() component

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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 (value × EchelonGraph’s weight)
Severity84% × 45%
The EG Score, 8.4 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
8th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 25, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 31, 2026
Patch available.
Web page

CVE-2026-52491.txt · GitHub

https://gist.github.com/okyfh/5cc53fa67d229017231cf18c91768bd9
Web page

fix oob write in thumbnail (#790) (9ce4d089) · Commits · libtiff / libtiff · GitLab

https://gitlab.com/libtiff/libtiff/-/commit/9ce4d089bcf25496663776d9e6336738112f09a3

Vendor Advisories for CVE-2026-52491(3)

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 / EcosystemFix (by version range) / 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.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
tiff4.5.0-6 ... 4.7.2-1 (23 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tiff4.7.0-3 ... 4.7.2-1 (10 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tiff4.7.0-3 ... 4.7.1-3 (6 versions)
  • every version up to 4.7.2-1: fixed in 4.7.2-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 139× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 229 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 129 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  3. 2026-10-12 15:58 UTCEG score recompute
  4. 2026-10-11 19:41 UTCEG score recompute
  5. 2026-10-11 16:56 UTCEG score recompute
  6. 2026-10-11 14:20 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  9. 2026-10-10 12:26 UTCEG score recompute
  10. 2026-10-10 12:26 UTCVendor advisory
  11. 2026-10-10 12:26 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  13. 2026-10-09 04:39 UTCEG score recompute
  14. 2026-10-09 04:39 UTCVendor advisory
  15. 2026-10-09 04:39 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  16. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  17. 2026-10-08 03:47 UTCEG score recompute
  18. 2026-10-08 03:47 UTCVendor advisory
  19. 2026-10-08 03:47 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  21. 2026-10-07 04:44 UTCVendor advisory
  22. 2026-10-07 04:44 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  23. 2026-10-06 16:10 UTCEG score recompute
  24. 2026-10-06 16:10 UTCVendor advisory
  25. 2026-10-06 16:10 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
Show 75 more
  1. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  2. 2026-10-06 02:44 UTCEG score recompute
  3. 2026-10-06 02:44 UTCVendor advisory
  4. 2026-10-06 02:44 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  5. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  6. 2026-10-05 09:21 UTCEG score recompute
  7. 2026-10-05 09:21 UTCVendor advisory
  8. 2026-10-05 09:21 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  10. 2026-10-04 20:40 UTCVendor advisory
  11. 2026-10-04 20:40 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  12. 2026-10-04 05:02 UTCVendor advisory
  13. 2026-10-04 05:02 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  14. 2026-10-03 16:29 UTCEG score recompute
  15. 2026-10-03 16:29 UTCVendor advisory
  16. 2026-10-03 16:29 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  18. 2026-10-02 22:33 UTCEG score recompute
  19. 2026-10-02 22:33 UTCVendor advisory
  20. 2026-10-02 22:33 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  22. 2026-10-02 09:55 UTCVendor advisory
  23. 2026-10-02 09:55 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  24. 2026-10-01 21:22 UTCEG score recompute
  25. 2026-10-01 21:22 UTCVendor advisory
  26. 2026-10-01 21:22 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  27. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  28. 2026-10-01 08:49 UTCVendor advisory
  29. 2026-10-01 08:49 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  30. 2026-09-30 20:17 UTCEG score recompute
  31. 2026-09-30 20:17 UTCVendor advisory
  32. 2026-09-30 20:17 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  33. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  34. 2026-09-30 06:57 UTCEG score recompute
  35. 2026-09-30 06:57 UTCVendor advisory
  36. 2026-09-30 06:57 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  37. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  38. 2026-09-29 15:05 UTCVendor advisory
  39. 2026-09-29 15:05 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  40. 2026-09-29 00:38 UTCEG score recompute
  41. 2026-09-29 00:38 UTCVendor advisory
  42. 2026-09-29 00:38 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  43. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  44. 2026-09-28 12:05 UTCVendor advisory
  45. 2026-09-28 12:05 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  46. 2026-09-27 23:32 UTCEG score recompute
  47. 2026-09-27 23:32 UTCVendor advisory
  48. 2026-09-27 23:32 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  49. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  50. 2026-09-27 10:58 UTCVendor advisory
  51. 2026-09-27 10:58 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  52. 2026-09-26 22:14 UTCEG score recompute
  53. 2026-09-26 22:14 UTCVendor advisory
  54. 2026-09-26 22:13 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  55. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  56. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  57. 2026-09-25 11:47 UTCVendor advisory
  58. 2026-09-25 11:47 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  59. 2026-09-24 22:16 UTCEG score recompute
  60. 2026-09-24 22:16 UTCVendor advisory
  61. 2026-09-24 22:16 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  62. 2026-09-24 09:09 UTCVendor advisory
  63. 2026-09-24 09:09 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  64. 2026-09-23 20:36 UTCEG score recompute
  65. 2026-09-23 20:36 UTCVendor advisory
  66. 2026-09-23 20:36 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  67. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-09-23 08:03 UTCVendor advisory
  69. 2026-09-23 08:03 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  70. 2026-09-22 19:30 UTCEG score recompute
  71. 2026-09-22 19:30 UTCVendor advisory
  72. 2026-09-22 19:30 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4
  73. 2026-09-22 06:57 UTCEG score recompute
  74. 2026-09-22 06:57 UTCVendor advisory
  75. 2026-09-22 06:57 UTCGHSA enrichmentGHSA-28v3-93mm-ccfv · GitHub severity HIGH · GitHub CVSS 8.4

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Frequently asked(5)

What is CVE-2026-52491?
CVE-2026-52491 is a high-severity vulnerability; its CVE record was published on August 25, 2026. An issue in libtiff 85f2ac8e0b01cb7db2bbecf4a3b891bdbef67938 allows an attacker to execute arbitrary code via the libtiff/tools/thumbnail.c: main() component
When was the CVE record for CVE-2026-52491 published?
The CVE record for CVE-2026-52491 was published on August 25, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-52491 actively exploited?
CVE-2026-52491 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (8th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-52491?
CVE-2026-52491 has a CVSS v3.1 base score of 8.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-52491?
A fix for CVE-2026-52491 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-52491 are linked in the Vendor Advisories panel on this page.

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