CVE-2026-45034

CRITICALPre-NVD 9.29.2—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (38th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated
9.2EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.5, CVE-2026-34084 was patched by the helper File::prohibitWrappers. The helper calls parse_url($filename, PHP_URL_SCHEME) and then checks is_string($scheme) && strlen($scheme) > 1 to reject stream wrappers such as phar://, php://, data:// or expect://. The check is not equivalent to "does the path contain a wrapper". When the input has the form phar:///path/file.phar/inner with three or more slashes after the scheme, parse_url returns boolean false instead of returning the scheme string. The is_string($scheme) branch is therefore skipped, the helper returns without throwing, and the caller proceeds. PHP's stream layer, however, still treats phar:///... as a valid phar wrapper and opens the underlying phar file. The result is that IOFactory::load($attackerPath) walks past the patch and still touches the phar wrapper. On PHP 7.x, simply reaching the phar wrapper via is_file is enough for PHP to automatically deserialize the phar metadata, which in turn invokes the magic methods __wakeup and __destruct of an attacker controlled object and gives full RCE. On PHP 8.x, automatic metadata deserialization for plain file ops was removed, so the chain at the PhpSpreadsheet layer reduces to a phar wrapper file read primitive, and RCE only resurfaces if the downstream consumer ever calls Phar::getMetadata. This vulnerability is fixed in 1.30.5.

CVSS v3
9.2
EG Score
9.2CRITICALmedium confidence
EG Risk
72
EG Risk 72/100

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)
Severity92% × 45%
The EG Score, 9.2 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (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
0.5%
EPSS %ILE
38th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

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 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

June 8, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Sep 15, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

CVE-2026-34084 patch bypass · Advisory · PHPOffice/PhpSpreadsheet · GitHub

https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-87m4-826x-3crx

Vendor Advisories for CVE-2026-45034(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
phpoffice/phpspreadsheet1.0.0 ... 1.9.0 (62 versions)
  • every version up to 1.30.5: fixed in 1.30.5
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 26× 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 99 of 135 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 36 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:47 UTCEG score recompute
  2. 2026-10-11 17:01 UTCEG score recompute
  3. 2026-10-11 14:26 UTCEG score recompute
  4. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-03 18:51 UTCOSV refresh
  13. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-14 04:48 UTCEG score recompute
  25. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
Show 74 more
  1. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  2. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  3. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  4. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  5. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  6. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  7. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  8. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  9. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  10. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  11. 2026-08-31 01:36 UTCEG score recompute
  12. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  13. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  14. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  15. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  16. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  17. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-08-25 01:14 UTCEG score recompute
  19. 2026-08-23 11:41 UTCEG score recompute
  20. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-08-22 00:05 UTCEG score recompute
  22. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  23. 2026-08-21 02:11 UTCEG score recompute
  24. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-08-20 09:27 UTCEG score recompute
  26. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  27. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  28. 2026-08-17 14:57 UTCEG score recompute
  29. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  30. 2026-08-17 01:44 UTCEG score recompute
  31. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  32. 2026-08-16 05:10 UTCEG score recompute
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  34. 2026-08-15 03:30 UTCEG score recompute
  35. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  36. 2026-08-13 22:26 UTCEG score recompute
  37. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  38. 2026-08-12 17:09 UTCEG score recompute
  39. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  40. 2026-08-11 13:51 UTCEG score recompute
  41. 2026-08-11 01:22 UTCEG score recompute
  42. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  43. 2026-08-09 15:54 UTCEG score recompute
  44. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  45. 2026-08-08 19:01 UTCEG score recompute
  46. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  47. 2026-08-07 18:01 UTCEG score recompute
  48. 2026-08-06 16:59 UTCEG score recompute
  49. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  50. 2026-08-05 20:14 UTCEG score recompute
  51. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  52. 2026-08-04 16:21 UTCEG score recompute
  53. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  54. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  55. 2026-08-03 15:20 UTCEG score recompute
  56. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  57. 2026-08-02 03:23 UTCEG score recompute
  58. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  59. 2026-08-01 10:46 UTCEG score recompute
  60. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  61. 2026-07-31 04:48 UTCEG score recompute
  62. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  63. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  64. 2026-07-29 06:13 UTCEG score recompute
  65. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  66. 2026-07-27 18:32 UTCEG score recompute
  67. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  68. 2026-07-26 21:41 UTCEG score recompute
  69. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  70. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  71. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  72. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  73. 2026-07-23 03:16 UTCEG score recompute
  74. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.4% · 27th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-45034?
CVE-2026-45034 is a critical-severity vulnerability; its CVE record was published on June 8, 2026. PhpSpreadsheet is a pure PHP library for reading and writing spreadsheet files. Prior to 1.30.5, CVE-2026-34084 was patched by the helper File::prohibitWrappers. The helper calls parseurl($filename, PHPURLSCHEME) and then checks isstring($scheme) && strlen($scheme) > 1 to reject stream wrappers…
When was the CVE record for CVE-2026-45034 published?
The CVE record for CVE-2026-45034 was published on June 8, 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 June 23, 2026; the record at its source may have been updated since.
Is CVE-2026-45034 actively exploited?
CVE-2026-45034 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45034?
CVE-2026-45034 has a CVSS base score of 9.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-45034?
A fix for CVE-2026-45034 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-45034 are linked in the Vendor Advisories panel on this page.

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