CVE-2026-59944

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

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

Score 6.1 from GitHub Security Advisory (severity: MODERATE) published 2026-10-02. A secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-80863 (ENISA EUVD) · GHSA-96h3-5x6v-m776 (GitHub Security Advisories)Source: ENISA EUVD

6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and from 2.3.0 until 2.10.3, a malicious or compromised dependency can bypass the earlier CVE-2026-59946 binary-path hardening because Composer validates literal parent-directory segments only during dependency resolution, while the symlink and installed-metadata paths described by the advisory skip that validation. A package can ship an in-package binary symlink that resolves outside its installation directory, or attacker-influenced vendor/composer/installed.json metadata can provide an escaping binary path during a reinstall or regeneration of missing vendor/bin entries. The installed-metadata path is reachable only when the vendor directory was not populated by the same validated install run, such as when it is restored from an untrusted cache, copied from an earlier build stage, carried over from an older Composer run, or writable by a lower-trust build step. Composer can follow the path, change the external target's permissions to make it world-readable and executable, and create a runnable vendor/bin proxy to that external file. The issue does not directly read or transmit data and does not by itself provide remote code execution. This issue is fixed in versions 2.2.30 and 2.10.3.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.5%
EPSS %ILE
41st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

September 16, 2026

Last Modified

September 30, 2026

Advisory Details (5)

Auto-updated Sep 16, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

2.2.30

Patch available: composer/composer 2.2.30

https://github.com/composer/composer/releases/tag/2.2.30
GitHub release Patch Available

2.10.3

Patch available: composer/composer 2.10.3

https://github.com/composer/composer/releases/tag/2.10.3
GitHub commit Patch Available

commit ad649fdfdf8e (composer/composer)

Patch available: composer/composer 2.2.30 (contains commit ad649fdfdf8e)

https://github.com/composer/composer/commit/ad649fdfdf8ed826d4a34e0e5690c76a0b4833aa
GitHub commit Patch Available

commit 53b8bb4c2469 (composer/composer)

Patch available: composer/composer 2.10.3 (contains commit 53b8bb4c2469)

https://github.com/composer/composer/commit/53b8bb4c24697b2f00a18cf1ef35a10392701b89
GitHub advisoryMentions a patch (unverified)

Package bin path can escape the package directory, bypassing the GHSA-gjfg-22fp-rrxx fix · Advisory · composer/composer · GitHub

https://github.com/composer/composer/security/advisories/GHSA-96h3-5x6v-m776

Vendor Advisories for CVE-2026-59944(2)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatcomposer-main-2.10.3-1.hum12026-09-03redhat
composercomposer/composer @ 2.10.3 (fixes >= 2.3.0, < 2.10.3)—ghsa
composercomposer/composer @ 2.2.30 (fixes >= 1.0, < 2.2.30)—ghsa

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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
composer—
  • every version up to 2.10.3-r0: fixed in 2.10.3-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.10.0-1 ... 2.9.8-1 (57 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.10.0-1 ... 2.9.8-1 (26 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
composer2.10.0-1 ... 2.9.8-1 (22 versions)
  • every version up to 2.10.3-1: fixed in 2.10.3-1
—
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
composer/composer1.0.0 ... 2.2.9 (163 versions)
  • 2.3.0 up to 2.10.3: fixed in 2.10.3
  • 1.0 up to 2.2.30: fixed in 2.2.30
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 35× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 114 rows 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 14 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-11-01 19:16 UTCEchelonGraph re-scored
  13. 2026-11-01 19:16 UTCVendor advisory
  14. 2026-11-01 19:16 UTCGHSA enrichmentGHSA-96h3-5x6v-m776 · GitHub severity MODERATE · GitHub CVSS 6.1
  15. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-11-01 07:41 UTCGHSA enrichmentGHSA-96h3-5x6v-m776 · GitHub severity MODERATE · GitHub CVSS 6.1
  17. 2026-11-01 07:41 UTCEchelonGraph re-scored
  18. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-30 09:55 UTCOSV refresh
  21. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 75 more
  1. 2026-10-25 14:16 UTCEchelonGraph re-scored
  2. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  4. 2026-10-22 20:56 UTCEchelonGraph re-scored
  5. 2026-10-22 20:56 UTCVendor advisory
  6. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  7. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-10-18 03:27 UTCEchelonGraph re-scored
  12. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  13. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  14. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  15. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  17. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  18. 2026-10-12 15:52 UTCEchelonGraph re-scored
  19. 2026-10-11 19:36 UTCEchelonGraph re-scored
  20. 2026-10-11 16:51 UTCEchelonGraph re-scored
  21. 2026-10-11 14:13 UTCEchelonGraph re-scored
  22. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-10-11 09:12 UTCEchelonGraph re-scored
  24. 2026-10-11 09:12 UTCVendor advisory
  25. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-10-10 06:25 UTCEchelonGraph re-scored
  27. 2026-10-10 06:25 UTCVendor advisory
  28. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-10-09 05:01 UTCEchelonGraph re-scored
  30. 2026-10-09 05:01 UTCVendor advisory
  31. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-10-08 03:37 UTCEchelonGraph re-scored
  33. 2026-10-08 03:37 UTCVendor advisory
  34. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  35. 2026-10-07 02:14 UTCEchelonGraph re-scored
  36. 2026-10-07 02:14 UTCVendor advisory
  37. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-10-06 00:51 UTCEchelonGraph re-scored
  39. 2026-10-06 00:51 UTCVendor advisory
  40. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  41. 2026-10-04 23:28 UTCEchelonGraph re-scored
  42. 2026-10-04 23:28 UTCVendor advisory
  43. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-10-03 22:05 UTCEchelonGraph re-scored
  45. 2026-10-03 22:05 UTCVendor advisory
  46. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  47. 2026-10-02 20:42 UTCEchelonGraph re-scored
  48. 2026-10-02 20:42 UTCVendor advisory
  49. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  50. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  51. 2026-10-01 19:17 UTCVendor advisory
  52. 2026-09-30 17:50 UTCEchelonGraph re-scored
  53. 2026-09-30 17:50 UTCVendor advisory
  54. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  55. 2026-09-30 12:33 UTCEchelonGraph re-scored
  56. 2026-09-30 12:33 UTCVendor advisory
  57. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  58. 2026-09-29 11:08 UTCEchelonGraph re-scored
  59. 2026-09-29 11:08 UTCVendor advisory
  60. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  61. 2026-09-28 09:44 UTCEchelonGraph re-scored
  62. 2026-09-28 09:44 UTCVendor advisory
  63. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  64. 2026-09-27 08:21 UTCEchelonGraph re-scored
  65. 2026-09-27 08:21 UTCVendor advisory
  66. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  67. 2026-09-26 06:58 UTCEchelonGraph re-scored
  68. 2026-09-26 06:58 UTCVendor advisory
  69. 2026-09-25 05:34 UTCEchelonGraph re-scored
  70. 2026-09-25 05:34 UTCVendor advisory
  71. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  72. 2026-09-24 04:11 UTCEchelonGraph re-scored
  73. 2026-09-24 04:11 UTCVendor advisory
  74. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  75. 2026-09-23 02:48 UTCEchelonGraph re-scored

Frequently asked(5)

What is CVE-2026-59944?
CVE-2026-59944 is a medium-severity vulnerability; its CVE record was published on September 16, 2026. Composer is a dependency Manager for the PHP language. From 1.0 until 2.2.30 and from 2.3.0 until 2.10.3, a malicious or compromised dependency can bypass the earlier CVE-2026-59946 binary-path hardening because Composer validates literal parent-directory segments only during dependency resolution,…
When was the CVE record for CVE-2026-59944 published?
The CVE record for CVE-2026-59944 was published on September 16, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-59944 actively exploited?
CVE-2026-59944 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-59944?
CVE-2026-59944 has a CVSS base score of 6.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-59944?
A fix for CVE-2026-59944 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59944 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59944

Explore →

Is Your Infrastructure Affected by CVE-2026-59944?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.