CVE-2026-73646

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100CISA SSVC

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
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
0.5%
EPSS %ILE
43rd
KEV
Not listed

CISA SSVCTrack 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 public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 24, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 17, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)🟡 PoC Available

Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure · Advisory · postcss/postcss · GitHub

https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849
github_release Patch Available

8.5.18

Patch available: postcss/postcss 8.5.18

https://github.com/postcss/postcss/releases/tag/8.5.18
github_commit Patch Available

commit 95663d3eb7ba (postcss/postcss)

Patch available: postcss/postcss 8.5.18 (contains commit 95663d3eb7ba)

https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c

Vendor Advisories for CVE-2026-73646(14)

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

Patch Availability(13)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhtas/rekor-search-ui-rhel9:17897258182026-09-23redhat
redhatsatellite/iop-vulnerability-frontend-rhel9:17896609832026-09-17redhat
redhatsatellite/iop-vulnerability-frontend-rhel9:17896609692026-09-17redhat
redhatrhmtc/openshift-migration-ui-rhel8:17895463732026-09-17redhat
redhatdevspaces/dashboard-rhel9:17891628842026-09-17redhat
redhatsatellite/iop-advisor-frontend-rhel9:17896595652026-09-17redhat
redhatsatellite/iop-host-inventory-frontend-rhel9:17896245192026-09-17redhat
redhatsatellite/iop-host-inventory-frontend-rhel9:17896131072026-09-17redhat
redhatrhacm2/console-rhel9:17888804842026-09-15redhat
redhatrhacm2/console-rhel9:17889728412026-09-15redhat
redhatdevspaces/openvsx-rhel9:17877591452026-09-01redhat
redhatprometheus3-5-main-3.5.5-0.8.hum12026-08-13redhat
redhatprometheus3-13-main-3.13.2-0.2.hum12026-08-04redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
node-postcss8.4.20+~cs8.0.23-1 ... 8.5.9+~cs9.3.30-1 (19 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
node-postcss8.4.49+~cs9.2.32-1 ... 8.5.9+~cs9.3.30-1 (15 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-postcss8.4.49+~cs9.2.32-1 ... 8.5.9+~cs9.3.30-1 (9 versions)
  • every version up to 8.5.19+~cs10.2.23-1: fixed in 8.5.19+~cs10.2.23-1
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
postcss—
  • every version up to 8.5.18: fixed in 8.5.18
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 61× 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.

Showing the most recent 100 of 114 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-73646?
CVE-2026-73646 is a high vulnerability published on July 24, 2026. PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits…
When was CVE-2026-73646 disclosed?
CVE-2026-73646 was first published on July 24, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73646 actively exploited?
CVE-2026-73646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (43rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73646?
CVE-2026-73646 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73646?
A fix for CVE-2026-73646 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73646 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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