CVE-2026-0770
CVE-2026-0770 is a security flaw in Langflow, a tool for building AI apps. Attackers can run their own code on Langflow. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 21 Jul 2026.[1]
Langflow is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff.
Description
CISA calls it an inclusion of functionality from untrusted control sphere in Langflow Langflow. In its words: “Langflow contains an inclusion of functionality from untrusted control sphere vulnerability that allows remote attackers to execute arbitrary code on affected installations.”[1]
The CVE record adds: “Langflow exec_globals Inclusion of Functionality from Untrusted Control Sphere Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Langflow. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the exec_globals parameter provided to the validate endpoint. The issue results from the inclusion of a resource from an untrusted control sphere. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-27325.”[2]
The underlying weakness is CWE-829, in MITRE’s list of common software weaknesses.
It scores 9.8 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by the organisation that published the CVE using CVSS 3.0.[2]
Affected versions
NVD’s record doesn’t list version ranges for it. CISA names the product as Langflow Langflow.
Most families won’t have Langflow; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 21 Jul 2026, 179 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 24 Jul 2026 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 63%. That’s in the top 1% of the flaws it scores.[3]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
CISA’s required action: “Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes).”[1]
- Check whether you use it.Langflow is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 24 Jul 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 9.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 63%.[3] |
See also
Other Langflow flaws
- CVE-2026-55255: authorization bypass through user-controlled key ·
- CVE-2025-34291: origin validation error ·
- CVE-2026-33017: code injection ·
- CVE-2025-3248: missing authentication ·
Similar flaws
- CVE-2025-32463, Sudo: inclusion of functionality from untrusted control sphere ·
Added the same day
- CVE-2026-63030, WordPress Core: interpretation conflict ·
- CVE-2026-60137, WordPress Core: SQL injection ·
- CVE-2021-27137, DD-WRT: stack-based buffer overflow ·
Every Langflow flaw on CISA’s list · Everything added in July 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability”. Known Exploited Vulnerabilities Catalog, added 21 Jul 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-0770 Detail”. National Vulnerability Database, published 23 Jan 2026.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.626, percentile 99.2, 31 Oct 2026.
- CVE Program. “CVE-2026-0770”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.