`CVE-2026-90809`

6.9 Medium Not applicable

CNA tag: x_open-source. The CNA marks the affected code open source.

Not yet in NVD's feed. The description, CVSS and CWE below come from the CVE Numbering Authority's own record, not from NVD analyst review. NVD's own page for this identifier may not exist yet.

Published yesterday. NVD backfills CPE data for days or weeks after publication, and OSV and the exploit indexes lag too. Scope and status here may change.

Description

A vulnerability was identified in HKUDS nanobot up to 0.2.1. The affected element is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component ExecTool. Such manipulation leads to argument injection. It is possible to launch the attack remotely. The name of the patch is af582246f141311d574551b7571a517bcc3df750. It is best practice to apply a patch to resolve this issue.

CWE-88CWE-74

Exploitation Status

No public exploit

Nothing published shows this CVE being exploited, which is not the same as ruling it out.

CVSS E:U

CISA KEV not listed
CISA Vulnrichment no assessment published
Indexed PoC none indexed
EPSS not scored

Waratek Defense Posture

Not applicable

Not a Java vulnerability. Outside ARMR's domain entirely.

Protection none
Action not-needed none
Review automated upstream-data
Record active x_open-source

Decided by unmatched-product : No tracked product matched above, and none present at all

Finding No affected products identified in CVE data

Decided by	`unmatched-product` : No tracked product matched above, and none present at all
Finding	No affected products identified in CVE data

CVSS

6.9 MEDIUM v4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X 4 metrics

VRT selects the newest version's highest entry and publishes it as cvssScore, newest rather than largest because scores are not comparable across versions, and highest rather than first because the first entry is frequently a CNA placeholder scoring 0.0 over NVD's own analysis.

Version Score Band Vector Assigner Type

CVSS 4.0 6.9 MEDIUM CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X VulDB Primary published

CVSS 3.1 7.3 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C VulDB Primary

CVSS 3.0 7.3 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C VulDB Primary

CVSS 2.0 7.5 no band published AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C VulDB Primary

Version	Score	Band	Vector	Assigner	Type
CVSS 4.0	6.9	MEDIUM	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`	VulDB	Primary	published
CVSS 3.1	7.3	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C`	VulDB	Primary
CVSS 3.0	7.3	HIGH	`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C`	VulDB	Primary
CVSS 2.0	7.5	no band published	`AV:N/AC:L/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C`	VulDB	Primary

References

URL	Tags
https://vuldb.com/vuln/403311	vdb-entry, technical-description
https://vuldb.com/vuln/403311/cti	signature, permissions-required
https://vuldb.com/cve/CVE-2026-90809	third-party-advisory
https://vuldb.com/submit/922850	third-party-advisory
https://github.com/HKUDS/nanobot/issues/5306	issue-tracking
https://github.com/HKUDS/nanobot/pull/5345	issue-tracking, patch
https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750	patch
https://github.com/HKUDS/nanobot/	product

URL

Timeline

Published 2026-09-14 Last modified 2026-09-14

Published	2026-09-14	By the CVE Program.
NVD record modified	2026-09-14	NVD's own last-modified date for this record.

Published

2026-09-14

By the CVE Program.

NVD record modified

2026-09-14

NVD's own last-modified date for this record.

Pipeline policy audit (14 of 21 rules evaluated)

14 of 21 rules ran. The rest were never reached, because an earlier stage settled the CVE, a distinct claim from a rule that ran and found nothing.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? first match wins

1 rejected no-match CVE Program withdrawal of this identifier

scope: Is the vulnerability ARMR's to address? first match wins

2 armr-patch-file no-match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no-match An ARMR security-rule template on disk for this CVE

4 manual-classification no-match A researcher's recorded decision for this specific CVE

5 manual classification no-match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no-match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no-match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the native WebLogic proxy plug-in. Oracle gives these no CPE of their own and names them only in the description.

8 osv-maven no-match An OSV.dev record of this CVE affecting a package published to Maven Central

9 cna-maven-package no-match An affected Maven artifact named by the CNA itself

10 known-cpe-product no-match An NVD CPE naming a product ARMR tracks

11 cna-cpe-product no-match A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

12 oracle-advisory-family no-match A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

13 non-deployable-product no-match The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

14 unmatched-product decided it matched Not applicable No tracked product matched

disposition: What do we do about one that is? cumulative: every rule gets a turn

15 patch-hint not-reached A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

16 open-source-maven not-reached The affected package being open source on Maven, so the fix can be read

17 poc-derivable not-reached An indexed exploit to reverse-engineer, where there is no source to read

18 no-exploit not-reached With no fix path, a public exploit, or a CISA record of one

19 secure-rule-match not-reached A vulnerability class already blocked by an ARMR security rule

20 below-action-threshold not-reached Medium or Low severity, no KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

21 no-exploit-published not-reached A published working exploit for this candidate, not only a proof of concept, a forecast, or nothing at all

Raw stored JSON document for this CVE ↗ · NVD ↗ · CVE.org ↗