CVE-2026-86540
published 2026-09-07CVE-2026-86540: knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary…
PriorityP345high7.8CVSS 3.1
AVLACLPRNUIRSUCHIHAH
EPSS
0.21%
10.4th percentile
knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.
Affected
1 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| knowns-dev | knowns | < 0.30.0 | 0.30.0 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
nvdv4.08.5HIGHCVSS: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
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GHSA
knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/
ghsa_unreviewed·2026-09-08
CVE-2026-86540 [HIGH] CWE-78 knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/
knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.
VulDB
knowns-dev knowns up to 0.29.x Configuration File knowns/config.json settings.lsp.languages input validation
vuldb·2026-09-08·CVSS 7.8
CVE-2026-86540 [HIGH] knowns-dev knowns up to 0.29.x Configuration File knowns/config.json settings.lsp.languages input validation
A vulnerability was found in knowns-dev knowns up to 0.29.x and classified as problematic. Impacted is an unknown function of the file knowns/config.json of the component Configuration File Handler. The manipulation of the argument settings.lsp.languages results in improper input validation.
This vulnerability is known as CVE-2026-86540. Attacking locally is a requirement. No exploit is available.
It is suggested to upgrade the affected component.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396https://github.com/knowns-dev/knowns/releases/tag/v0.30.0https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary
2026-09-07
Published