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Vulnerability details: VCID-byja-84wd-bbep
Vulnerability ID VCID-byja-84wd-bbep
Aliases CVE-2026-40261
GHSA-gqw4-4w2p-838q
Summary
Status Published
Exploitability 0.5
Weighted Severity 7.9
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-20 Improper Input Validation
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 8.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-40261.json
epss 0.00042 https://api.first.org/data/v1/epss?cve=CVE-2026-40261
cvssv3.1 7.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-gqw4-4w2p-838q
cvssv3.1 8.8 https://github.com/composer/composer
generic_textual HIGH https://github.com/composer/composer
cvssv3.1 8.8 https://github.com/composer/composer/releases/tag/2.9.6
generic_textual HIGH https://github.com/composer/composer/releases/tag/2.9.6
ssvc Track https://github.com/composer/composer/releases/tag/2.9.6
cvssv3.1 8.8 https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
cvssv3.1_qr HIGH https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
generic_textual HIGH https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
ssvc Track https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
cvssv3.1 8.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40261.yaml
generic_textual HIGH https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40261.yaml
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2026-40261
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-40261
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-40261.json
https://api.first.org/data/v1/epss?cve=CVE-2026-40261
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-40261
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40261.yaml
https://nvd.nist.gov/vuln/detail/CVE-2026-40261
2458841 https://bugzilla.redhat.com/show_bug.cgi?id=2458841
2.9.6 https://github.com/composer/composer/releases/tag/2.9.6
GHSA-gqw4-4w2p-838q https://github.com/advisories/GHSA-gqw4-4w2p-838q
GHSA-gqw4-4w2p-838q https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
RHSA-2026:8165 https://access.redhat.com/errata/RHSA-2026:8165
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-40261.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/composer/composer
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/composer/composer/releases/tag/2.9.6
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-04-16T13:41:03Z/ Found at https://github.com/composer/composer/releases/tag/2.9.6
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-04-16T13:41:03Z/ Found at https://github.com/composer/composer/security/advisories/GHSA-gqw4-4w2p-838q
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/composer/composer/CVE-2026-40261.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2026-40261
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.13004
EPSS Score 0.00042
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-10T18:14:25.616484+00:00 SUSE Severity Score Importer Import https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml 38.6.0