[UPDATE] [high] Netty: Multiple vulnerabilities
A remote, anonymous attacker can exploit multiple vulnerabilities in Netty to bypass security measures, manipulate data, disclose confidential information, or cause a denial-of-service condition.
CSIRTS triage
- What
- Multiple vulnerabilities allow a remote, anonymous attacker to bypass security measures, manipulate data, disclose confidential information, or cause a denial-of-service condition.
- Who is affected
- Deployments of Netty.
- Urgency
- Remediation is high urgency due to the severity and potential for exploitation.
- Action
- Update to the latest version of Netty.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1814
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-500090.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 11% of all EPSS-scored CVEs.
- Moderate exploitation riskCVE-2026-442491.0% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 60% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-442500.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-448900.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-448920.28% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 20% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-448930.62% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 47% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-448940.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-454160.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 55% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-455360.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-456730.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.
Referenced CVEs
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploited[UPDATE] [hoch] Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, und Jira): Mehrere Schwa…cert-bund
- high[UPDATE] [hoch] Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: …cert-bund
- mediumexploited[NEW] [medium] IBM Planning Analytics: Multiple vulnerabilitiescert-bund
- unknownNCSC-2026-0325 [1.00] [M/H] Kwetsbaarheden verholpen in Atlassian productenncsc-nl
- unknownexploitedMultiple vulnerabilities in IBM products (August 21, 2026)cert-fr-avis
- unknownexploitedMultiple vulnerabilities in IBM products (August 14, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in IBM products (July 24, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in IBM products (July 17, 2026)cert-fr-avis
- highGHSA-4grm-h2qv-h6w6: Netty HTTP/3 QPACK Blocked Streams Memory Exhaustionghsa
- highGHSA-h2qv-fj59-j46j: Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Mem…ghsa
- mediumGHSA-c2gf-v879-257j: netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Le…ghsa
- highGHSA-6jv9-x5w9-2ccm: Netty's Lack of Lifecycle Cleanup Leads to Pooled ByteBuf Leak in RedisArrayAggregatorghsa
Recent advisories for Netty
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- medium[UPDATE] [mittel] Netty: Mehrere Schwachstellencert-bund · 2026-09-04
- medium[NEW] [medium] Netty: Multiple vulnerabilitiescert-bund · 2026-09-02
- high[NEW] [high] Netty: Multiple vulnerabilitiescert-bund · 2026-09-02
- medium[UPDATE] [medium] Netty: Multiple vulnerabilitiescert-bund · 2026-09-01
- medium[UPDATE] [medium] Keycloak (netty-codec-http): Vulnerability allows file manipulationcert-bund · 2026-09-01
- mediumCVE-2026-47874: The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connect…nvd · 2026-08-27
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