Trellix Source Code Breach Highlights Supply Chain Threats TechTarget and Informa Tech’s Digital Business Combine.TechTarget and InformaTechTarget and Informa Tech’s Digital Business Combine.Together, we power an unparalleled network of 220+ online properties covering 10,000+ granular topics, serving an audience of 50+ million professionals with original, objective content from trusted sources. We help you gain critical insights and make more informed decisions across your business priorities.Dark Reading Resource LibraryBlack Hat NewsOmdia CybersecurityAdvertiseNewsletter Sign-UpNewsletter Sign-UpCybersecurity TopicsRelated TopicsApplication SecurityCybersecurity CareersCloud SecurityCyber RiskCyberattacks & Data BreachesCybersecurity AnalyticsCybersecurity OperationsData PrivacyEndpoint SecurityICS/OT SecurityIdentity & Access Mgmt SecurityInsider ThreatsIoTMobile SecurityPerimeterPhysical SecurityRemote WorkforceThreat IntelligenceVulnerabilities & ThreatsRecent in Cybersecurity TopicsСloud SecurityHackers Use AI for Exploit Development, Attack AutomationHackers Use AI for Exploit Development, Attack AutomationbyAlexander CulafiMay 11, 20264 Min ReadСloud SecurityAfter Replacing TeamPCP Malware, 'PCPJack' Steals Cloud SecretsAfter Replacing TeamPCP Malware, 'PCPJack' Steals Cloud SecretsbyNate NelsonMay 7, 20265 Min ReadWorld Related TopicsDR GlobalMiddle East & AfricaAsia PacificLatin AmericaSee AllThe EdgeDR TechnologyEventsRelated TopicsUpcoming EventsPodcastsWebinarsSEE ALLResourcesRelated TopicsResource LibraryNewslettersPodcastsReportsVideosWebinarsWhite Papers Partner PerspectivesDark Reading Resource LibraryCyberattacks & Data BreachesApplication SecurityCyber RiskVulnerabilities & ThreatsNewsTrellix Source Code Breach Highlights Growing Supply Chain ThreatsInfo is scant, but such breaches can reveal where a security product's controls are located and how detections are designed, giving attackers a leg up.Rob Wright,Senior News Director,Dark ReadingMay 5, 20264 Min ReadSource: frantic via Alamy Stock PhotoUPDATECybersecurity vendor Trellix published a terse statement last Friday, disclosing that a threat actor recently gained unauthorized access to "a portion of our source code repository." Trellix did not reveal what portion was compromised and provided few details about the breach."Based on our investigation to date, we have found no evidence that our source code release or distribution process was affected, or that our source code has been exploited," the company said in its statement. "As part of our commitment to our broader security community, we intend to share further details as appropriate once our investigation is complete."Trellix said it immediately began working with "leading forensic experts" to investigate the breach and also notified law enforcement. But many questions remain, including where the repository resides, how it was compromised, and who was behind the attack. Dark Reading contacted Trellix for further comment but the company declined.Related:ShinyHunters Claims Second Attack Against InstructureThe Trellix breach is the latest supply chain attack impacting the cybersecurity industry. In March, a threat group known as TeamPCP compromised Trivy, an open source scanner maintained by Aqua Security, and KICS, an open source code analysis tool developed by CheckMarx.In both attacks, TeamPCP actors targeted GitHub Actions workflows to push out poisoned versions of the open source tools. At this stage, there's no indication that TeamPCP is connected to the Trellix breach, and no threat actor has claimed credit for the attack. But regardless of who the adversary is, source code breaches for security vendors can carry significant risk for downstream customers.Security Supply Chain MayhemIn the recent TeamPCP attacks, the threat group used the CI/CD secrets obtained in one repository breach to gain access to other organizations' repositories, repeating the cycle several times throughout the ongoing campaign. CI/CD secrets can include credentials, SSH keys, release signing keys, and GitHub Action tokens.TeamPCP isn't the only threat group eyeing security vendors' code; in October 2025, F5 Networks disclosed that a nation-state actor breached its product development environment and obtained sensitive data for the company's flagship BIG-IP product line, including source code. And in 2022, both Okta and Lastpass suffered breaches in which threat actors gained access to product source code. It's unclear what effects Trellix's breach may have on the company and its customers. "The risk depends on what the attackers actually got and whether they could touch the build or release process," Raphael Silva, researcher at Aikido Security, tells Dark Reading. "If it was read-only access to part of a repository, the main concern for the downstream customers would be if the same access also included any CI/CD access, signing keys, package publishing credentials, etc. Essentially, the ability to modify what gets shipped to the end users."Related:Instructure Breach Exposes Schools' Vendor DependenceFortunately, based on what Trellix has shared so far, there's no indication that the attackers gained that type of access, Silva says. Still, a source code breach can provide a map of a security product's layout, such as where controls are located and how detections are designed. Such information can give attackers a leg up, says Isaac Evans, founder and CEO of application security vendor Semgrep. "Even though the breach has been detected, it may not be trivial to remove an attacker's access," Evans adds. "For instance, in the Aqua security [Trivy] breach from earlier this year, the initial defense response still allowed attackers to modify source code after the defenders were alerted."Feross Aboukhadijeh, CEO of Socket, emphasized that one breached developer environment can lead to the next compromised package or project, as attackers use not just stolen secrets but publishing workflows to spread further attacks. Related:Attacks Abuse Windows Phone Link to Steal Texts & Bypass 2FA"What we’re seeing across recent incidents is that attackers are targeting the critical infrastructure of software development: source repos, CI/CD, package registries, maintainer accounts, and publish tokens," Aboukhadijeh says. "TeamPCP’s recent attacks are a more aggressive version of that trend because they use package execution to steal credentials and move across ecosystems."This article was updated at 11 a.m. ET on May 8 to reflect comments from Socket.Don't miss the latest Dark Reading Confidential podcast, How the Story of a USB Penetration Test Went Viral. Two decades ago Dark Reading posted its first blockbuster piece — a column by a pen tester who sprinkled rigged thumb drives around a credit union parking lot and let curious employees do the rest. This episode looks back at the history-making piece with its author, Steve Stasiukonis. Listen now!About the AuthorRob WrightSenior News Director, Dark ReadingRob Wright is a longtime reporter with more than 25 years of experience as a technology journalist. Prior to joining Dark Reading as senior news director, he spent more than a decade at TechTarget's SearchSecurity in various roles, including senior news director, executive editor and editorial director. Before that, he worked for several years at CRN, Tom's Hardware Guide, and VARBusiness Magazine covering a variety of technology beats and trends. Prior to becoming a technology journalist in 2000, he worked as a weekly and daily newspaper reporter in Virginia, where he won three Virginia Press Association awards in 1998 and 1999. He graduated from the University of Richmond in 1997 with a degree in journalism and English. A native of Massachusetts, he lives in the Boston area. See more from Rob WrightWant more Dark Reading stories in your Google search results?Add Us NowMore InsightsIndustry ReportsHow Enterprises Are Developing Secure ApplicationsInside RSAC 2026: security leaders reveal the risks redefining your defense strategyHow Enterprises Are Harnessing Emerging Technologies in CybersecurityDitch the Data Center: Understanding Flexible Cloud Infrastructure Security Management2025 State of MalwareAccess More ResearchWebinarsThe New Attack Surface: How Attackers Are Exploiting OAuth to Own Your Cloud WorkspacePrompt Injection Is Just the Start: Securing LLMs in AI SystemsAnatomy of a Data Breach: What to Do if it Happens to YouHow Well Can You See What's in Your Cloud?Implementing CTEM: Beyond Vulnerability ManagementMore WebinarsEditor's ChoiceThreat IntelligenceFrom Stuxnet to ChatGPT: 20 News Events That Shaped CyberFrom Stuxnet to ChatGPT: 20 News Events That Shaped CyberbyDark Reading Editorial TeamMay 6, 202631 Min ReadCyber RiskPhysical Cargo Theft Gets a Boost From CybercriminalsPhysical Cargo Theft Gets a Boost From CybercriminalsbyRobert LemosMay 4, 20265 Min ReadWant more Dark Reading stories in your Google search results?Keep up with the latest cybersecurity threats, newly discovered vulnerabilities, data breach information, and emerging trends. Delivered daily or weekly right to your email inbox.SubscribeRSAC 2026: key news & insightsAt RSAC 2026, Dark Reading captured critical intelligence on AI, new attack methods, geopolitics, and much moreGet Your RecapWebinarsThe New Attack Surface: How Attackers Are Exploiting OAuth to Own Your Cloud WorkspaceWed, June 24,2026 at 1pm ESTPrompt Injection Is Just the Start: Securing LLMs in AI SystemsTues, May 26, 2026, at 1pm ESTAnatomy of a Data Breach: What to Do if it Happens to YouJune 18th, 2026 | 11:00am -5:00pm ET | Doors Open at 10:30am ETHow Well Can You See What's in Your Cloud?Thurs, June 4, 2026 at 1:00pm ESTImplementing CTEM: Beyond Vulnerability ManagementThurs, May 21, 2026 at 1pm ESTMore WebinarsBlack Hat USA | Mandalay Bay, Las VegasThe premier cybersecurity event of the year returns to Mandalay Bay with a re‑engineered, six‑day program built to ignite innovation, push boundaries, and bring the global security community together like never before. Use code: DARKREADING to save $200 on a Briefings pass or $100 on a Business pass.GET YOUR PASSDiscover MoreBlack HatOmdiaWorking With UsAbout UsAdvertiseReprintsJoin UsNewsletter Sign-UpFollow UsCopyright © 2026 TechTarget, Inc. d/b/a Informa TechTarget. This website is owned and operated by Informa TechTarget, part of a global network that informs, influences and connects the world’s technology buyers and sellers. All copyright resides with them. Informa PLC’s registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. TechTarget, Inc.’s registered office is 275 Grove St. Newton, MA 02466.Home|Cookie Policy|Privacy|Terms of UseYour Privacy Choices

The recent source code breach impacting Trellix, a cybersecurity vendor, represents a significant and concerning supply chain threat within the industry. As detailed by Rob Wright of Dark Reading, the attack highlighted vulnerabilities inherent in relying on third-party security tools and the potential for adversaries to gain detailed knowledge of a vendor’s security controls and detection mechanisms. The breach, initiated by a threat actor utilizing CI/CD secrets, mirrored previous attacks, most notably TeamPCP’s manipulation of Trivy and KICS, demonstrating a pattern of targeting open-source security tools via GitHub Actions workflows. Trellix’s response, marked by collaboration with forensic experts and law enforcement, underscores the urgency and complexity of addressing such incidents. The risk associated with source code breaches extends beyond Trellix itself, potentially allowing attackers to directly influence the development or release processes of downstream customers, as emphasized by Raphael Silva of Aikido Security. The potential impact hinges on the extent of the attacker’s access – specifically, whether it included control over CI/CD pipelines, signing keys, or package publishing credentials. Isaac Evans, CEO of Semgrep, notes that even after detection, complete removal of an attacker’s influence is challenging, citing the Aqua Security breach as an example where defensive responses were initially circumvented. Feross Aboukhadijeh of Socket further highlights the broader trend of attackers probing critical infrastructure – source repos, CI/CD, package registries – and emphasizes the interconnectedness of the software development ecosystem. The Trellix incident adds to a growing list of supply chain attacks, including F5 Networks’ breach, which underscored the vulnerability of major vendors to nation-state actors, and Okta and Lastpass incidents, revealing potential compromises of product source code. This escalating trend underscores the need for enhanced security practices across the entire security vendor landscape, focusing on safeguarding developers’ environments and critical infrastructure to mitigate the risk of widespread disruption and exploitation.