NEW YORK, December 29, 2025, 20:50 ET — Market closed
- MongoDB shares closed down 2.9% on Monday, underperforming several cloud-software peers.
- The company issued a security update on a MongoDB Server vulnerability nicknamed “MongoBleed.”
- U.S. and Australian cyber agencies warned the flaw is being exploited, with a federal patch deadline set for Jan. 19.
MongoDB, Inc. (MDB) shares closed down 2.9% on Monday at $423.14 after the database company posted a security update on a vulnerability informally called “MongoBleed.” The stock traded between $420.90 and $435.00 during the session. 1
Why this matters now: MongoDB’s software sits at the center of many applications, so urgent patching can trigger emergency maintenance, downtime risk and tough questions from customers about data protection. For a company that sells both self-managed database software and Atlas, its managed cloud database service, trust and response time are part of the product.
The concern intensified after government agencies flagged active exploitation. The Record reported the U.S. Cybersecurity and Infrastructure Security Agency added the flaw to its Known Exploited Vulnerabilities catalog — a list of bugs confirmed to be used in attacks — and ordered federal civilian agencies to patch by Jan. 19, while Australia’s Cyber Security Centre said it was aware of active global exploitation. 2
The vulnerability is tracked as CVE-2025-14847, one of the standardized “CVE” identifiers used to catalogue software flaws. The U.S. National Vulnerability Database described it as a mismatch in zlib-compressed protocol headers that could let an unauthenticated client read uninitialized memory — essentially data left sitting in a system’s memory. 3
MongoDB’s own advisory listed the issue as affecting multiple major server branches and said fixed releases include 8.2.3, 8.0.17, 7.0.28, 6.0.27, 5.0.32 and 4.4.30, among others. It scored the issue 8.7 on the CVSS scale, a widely used severity rating where higher is worse. 4
MongoDB’s CTO Jim Scharf wrote that the vulnerability was patched and was “not a breach or compromise of MongoDB, MongoDB Atlas (our managed MongoDB Server offering), or our systems,” while urging customers to run the latest versions. 5
The stock’s drop also came on a softer tape for technology shares broadly. Wall Street’s main indexes ended lower on Monday as heavyweight tech names retreated, with the Nasdaq down 0.5% and the S&P 500 down 0.35%, Reuters reported; traders were also bracing for light holiday trading and a midweek run of Fed minutes and jobless-claims data, with U.S. markets closed Thursday for New Year’s Day. 6
Late quotes showed database and cloud-software names mostly steadier than MongoDB, with Oracle down about 1.3% and Snowflake and Datadog off less than 1%.
For investors, the immediate watch is whether the “MongoBleed” headlines stay contained to patching, or evolve into broader concern about incident response costs and customer disruption. MongoDB’s message that Atlas has already been patched may keep attention on the risk to self-managed deployments, where upgrade timing sits with customers.
Before Tuesday’s session, traders will be watching whether MongoDB holds the $420 area after Monday’s pullback, with year-end positioning and thin liquidity often exaggerating moves. Any follow-on advisories or evidence of wider exploitation could keep the stock sensitive to security-related headlines.
Looking further out, MongoDB has not confirmed its next earnings publication date; market calendars generally estimate an early-March report. Investors typically look for Atlas growth and margin commentary to gauge whether customers are expanding usage or tightening budgets. 7
