Critical DoS Vulnerability in nghttp2 Affects Multiple Debian Releases
Article Content
- •CVE-2026-27135 is a critical DoS vulnerability in nghttp2 affecting Debian systems.
- •Patches are available for Debian 11, 12, and 13, with specific versions recommended for each.
- •The vulnerability was disclosed on March 18, 2026, with a PoC released shortly after.
A critical denial-of-service (DoS) vulnerability, CVE-2026-27135, was identified in nghttp2, affecting Debian distributions. The flaw allows attackers to exploit missing iframe state validations, leading to assertion failures. For Debian 11 (bullseye), the issue has been patched in version 1.43.0-1+deb11u3, while Debian 12 (bookworm) and Debian 13 (trixie) have received updates in versions 1.52.0-1+deb12u3 and 1.64.0-1.1+deb13u1, respectively. Users are advised to upgrade their nghttp2 packages to mitigate the risk. The vulnerability was published on March 18, 2026, with a proof of concept (PoC) made public on April 6, 2026. The urgency of the situation is underscored by the critical nature of the flaw and its potential impact on system availability.
Ask AI about this cluster
Answers cite the sources they use
Timeline
More articles in this cluster (2)
Following this threat?
Track Debian and CVE-2026-27135 in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.
Free account · no card needed
Continue Reading
CISA Mandates Urgent Patching of Five Critical Flaws Exploited by Flax Typhoon The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has ordered federal agencies to patch five critical vulnerabilities by October 11, 2026, following exploitation by the China-linked hacking group Flax Typhoon. The vulnerabilities, added to CISA's Known Exploited Vulnerabilities (KEV) catalog, include… 
Critical Zero-Day Exploit Found in BeyondTrust Remote Support BeyondTrust disclosed a critical vulnerability, CVE-2026-102764, in its Remote Support product, exploited by the suspected China-linked group ARMORY CASTLE since August 2026. This flaw, with a CVSS score of 9.3, allows attackers to perform arbitrary file uploads and gain host-level control without requiring…