CVE-2026-59083

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; 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
9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected.

Users are recommended to upgrade to version 11.0.24, 10.1.57 or 9.0.120, which fix the issue.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity91% × 45%
The EG Score, 9.1 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 14, 2026

Last Modified

July 14, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
Patch available.
Web page

oss-security - CVE-2026-59083: Apache Tomcat: Incorrect URL decoding in RewriteValve may allow security control bypass

http://www.openwall.com/lists/oss-security/2026/07/14/7
Web page
https://lists.apache.org/thread/3g63zos2gkjo5vgnrk8kxmosv47w6wbq

Vendor Advisories for CVE-2026-59083(13)

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

Patch Availability(14)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatjws6-tomcat2026-10-01redhat
redhatjws6-tomcat-0:10.1.49-16.redhat_00016.1.el9jws2026-10-01redhat
redhattomcat9-1:9.0.120-1.el10_22026-09-18redhat
redhattomcat-1:9.0.120-1.el9_42026-09-17redhat
redhattomcat-1:9.0.120-1.el9_22026-09-17redhat
redhattomcat-1:9.0.120-1.el8_82026-09-17redhat
redhattomcat-1:9.0.120-2.el9_82026-09-17redhat
redhattomcat-1:9.0.120-1.el9_62026-09-17redhat
redhattomcat-1:9.0.120-1.el8_102026-09-17redhat
redhattomcat9-1:9.0.120-1.el10_02026-09-14redhat
redhatpatch2026-08-05redhat
redhatjws7-tomcat-0:11.0.21-6.redhat_00005.1.el9jws2026-08-05redhat
redhattomcat10-main-10.1.57-1.hum12026-07-10redhat
redhattomcat11-main-11.0.24-0.1.hum12026-07-08redhat

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

(9 across 4 ecosystems)
Debian:13(3)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.40-1 ... 10.1.60-1 (11 versions)
  • every version on: no fix on record
—
tomcat1111.0.11-1 ... 11.0.6-1 (10 versions)
  • every version on: no fix on record
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:14(3)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.40-1 ... 10.1.55-1~deb13u1 (10 versions)
  • every version up to 10.1.60-1: fixed in 10.1.60-1
—
tomcat1111.0.11-1 ... 11.0.6-1 (9 versions)
  • every version up to 11.0.24-1: fixed in 11.0.24-1
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
tomcat1010.1.10-1 ... 10.1.9-1 (37 versions)
  • every version on: no fix on record
—
tomcat9—
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tomcat99.0.43-1 ... 9.0.70-1 (28 versions)
  • every version up to 9.0.70-2: fixed in 9.0.70-2
—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 19× in last 7d / 59× 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 559 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 459 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 11:17 UTCEG score recompute
  2. 2026-10-14 11:17 UTCVendor advisory
  3. 2026-10-14 11:16 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  5. 2026-10-13 08:57 UTCEG score recompute
  6. 2026-10-13 08:57 UTCVendor advisory
  7. 2026-10-13 08:57 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  8. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-10-12 15:53 UTCEG score recompute
  10. 2026-10-12 06:40 UTCVendor advisory
  11. 2026-10-12 06:40 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  12. 2026-10-11 19:36 UTCEG score recompute
  13. 2026-10-11 16:51 UTCEG score recompute
  14. 2026-10-11 14:14 UTCEG score recompute
  15. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  24. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
Show 75 more
  1. 2026-10-01 13:28 UTCEG score recompute
  2. 2026-10-01 13:28 UTCVendor advisory
  3. 2026-10-01 13:28 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  7. 2026-09-28 13:24 UTCVendor advisory
  8. 2026-09-28 13:24 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  9. 2026-09-28 09:24 UTCEG score recompute
  10. 2026-09-28 09:24 UTCVendor advisory
  11. 2026-09-28 09:24 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  12. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-09-24 09:56 UTCEG score recompute
  16. 2026-09-24 09:56 UTCVendor advisory
  17. 2026-09-24 09:56 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  18. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  19. 2026-09-23 08:13 UTCVendor advisory
  20. 2026-09-23 08:13 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  21. 2026-09-23 04:13 UTCEG score recompute
  22. 2026-09-23 04:13 UTCVendor advisory
  23. 2026-09-23 04:13 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  24. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  25. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  26. 2026-09-18 10:05 UTCVendor advisory
  27. 2026-09-18 10:05 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  28. 2026-09-18 04:57 UTCEG score recompute
  29. 2026-09-18 04:57 UTCVendor advisory
  30. 2026-09-18 04:57 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  31. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  32. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  33. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  34. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  35. 2026-09-14 11:36 UTCVendor advisory
  36. 2026-09-14 11:36 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  37. 2026-09-14 07:29 UTCVendor advisory
  38. 2026-09-14 07:29 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  39. 2026-09-14 03:29 UTCVendor advisory
  40. 2026-09-14 03:29 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  41. 2026-09-13 23:29 UTCEG score recompute
  42. 2026-09-13 23:29 UTCVendor advisory
  43. 2026-09-13 23:29 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  44. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  45. 2026-09-13 16:28 UTCVendor advisory
  46. 2026-09-13 16:28 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  47. 2026-09-13 11:56 UTCVendor advisory
  48. 2026-09-13 11:56 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  49. 2026-09-13 07:56 UTCEG score recompute
  50. 2026-09-13 07:56 UTCVendor advisory
  51. 2026-09-13 07:56 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  52. 2026-09-12 13:24 UTCVendor advisory
  53. 2026-09-12 13:24 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  54. 2026-09-12 07:29 UTCVendor advisory
  55. 2026-09-12 07:29 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  56. 2026-09-12 01:48 UTCEG score recompute
  57. 2026-09-12 01:48 UTCVendor advisory
  58. 2026-09-12 01:48 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  59. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  60. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  61. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  62. 2026-09-08 01:49 UTCEG score recompute
  63. 2026-09-08 01:49 UTCVendor advisory
  64. 2026-09-08 01:49 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  65. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  66. 2026-09-06 17:52 UTCEG score recompute
  67. 2026-09-06 17:52 UTCVendor advisory
  68. 2026-09-06 17:52 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  69. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  70. 2026-09-06 13:47 UTCVendor advisory
  71. 2026-09-06 13:47 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  72. 2026-09-06 01:36 UTCVendor advisory
  73. 2026-09-06 01:36 UTCGHSA enrichmentGHSA-hcjr-322h-429r · GitHub severity CRITICAL · GitHub CVSS 9.1
  74. 2026-09-05 21:20 UTCEG score recompute
  75. 2026-09-05 21:20 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-59083?
CVE-2026-59083 is a critical-severity vulnerability; its CVE record was published on July 14, 2026. Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through 9.0.119, from 8.5.0…
When was the CVE record for CVE-2026-59083 published?
The CVE record for CVE-2026-59083 was published on July 14, 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 July 14, 2026; the record at its source may have been updated since.
Is CVE-2026-59083 actively exploited?
CVE-2026-59083 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59083?
CVE-2026-59083 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-59083?
A fix for CVE-2026-59083 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59083 are linked in the Vendor Advisories panel on this page.

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