CVE-2026-40516: OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and we

Q: How do I fix CVE-2026-40516?

openharness: upgrade to 2026-04-11. Exact commands for each OS are on this page.

Q: Is CVE-2026-40516 being exploited?

CVE-2026-40516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40516 affect?

CVE-2026-40516 affects openharness. Severity is high (CVSS 8.3). OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper

Q: How urgent is CVE-2026-40516?

Priority 41/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 8.3REMOTEUPGRADE

CVE-2026-40516 is a high-severity flaw (CVSS 8.3) affecting openharness. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper validation of target addresses. Attackers can influence an agent session to invoke these tools against loopback, RFC1918, link-local, or other non-public addresses to read response bodies from local development

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-918
Published	2026-04-17
Last modified	2026-10-26

Publisher (CNA): VulnCheck · Vendor: hkuds

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-17 17:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

hkuds openharness UPGRADE

Affected: < 2026-04-11

Fixed in: 2026-04-11

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy openharness || rpm -q openharness || openharness --version

2. UPGRADE to 2026-04-11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openharness

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openharness

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40516?

openharness: upgrade to 2026-04-11. Exact commands for each OS are on this page.

Is CVE-2026-40516 being exploited?

CVE-2026-40516 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40516 affect?

CVE-2026-40516 affects openharness. Severity is high (CVSS 8.3). OpenHarness before commit bd4df81 contains a server-side request forgery vulnerability in the web_fetch and web_search tools that allows attackers to access private and localhost HTTP services by manipulating tool parameters without proper

How urgent is CVE-2026-40516?

Priority 41/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

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CVE-2026-7551 HIGH 8.8 UPGRADE HKUDS OpenHarness contains a remote code execution vulnerability in the /bridge slash command that allows remo
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References

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