CVE-2026-12958 json
Arbitrary file write in Language Servers for AWS
published 4mo ago modified 14d ago also GHSA-6v3r-4p5c-mrp5 , EUVD-2026-38489
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
Missing symlink validation in Language Servers for AWS may allow an arbitrary file write outside of the workspace trust boundary. This may occur when a local user opens a workspace with a maliciously crafted symlink that resolves to a file path outside the workspace trust boundary.
To remediate this issue, users should upgrade to version 1.69.0 or higher.
Patch / fix
- npm @aws/lsp-codewhisperer 0.0.117
- Amazon Web Services Language Servers for AWS 1.69.0
Is CVE-2026-12958 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 4mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 8.5 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 8.5 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @aws/lsp-codewhisperer | <0.0.117 |
0.0.117 |
Affected products
- Amazon Web Services Language Servers for AWS
Classification
- Weakness
-
- CWE-61 UNIX Symbolic Link (Symlink) Following
References
-
github.com
/Amazon-Q-Developer/language-servers/pull/2742
web
-
github.com
/Amazon-Q-Developer/language-servers/commit/6c279b083cc192aa5df1f38c2c185576fd5234f5
web
-
aws.amazon.com
/security/security-bulletins/2026-047-aws/
vendor-advisory
-
github.com
/aws/language-servers/security/advisories/GHSA-6v3r-4p5c-mrp5
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-12958
advisory
-
aws.amazon.com
/security/security-bulletins/2026-047-aws
web
-
github.com
/Amazon-Q-Developer/language-servers/releases/tag/agentic-rc-1.69.0
web
-
github.com
/Amazon-Q-Developer/language-servers/releases/tag/lsp-codewhisperer/v0.0.117
web
-
github.com
/aws/language-servers
package
Sources
- CVE List CVE-2026-12958
- GitHub Advisory GHSA-6v3r-4p5c-mrp5
- NVD CVE-2026-12958
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