nghttp2 before 1.7.1 allows remote attackers to cause a denial of service (memory exhaustion).

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• fedoraproject fedora22
• fedoraproject fedora23
• nghttp2 nghttp2before 1.7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (certcc). Independent of NVD's CPE analysis and usually ahead of it.

• nghttp2 nghttp2

  • before 1.7.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2024-28182Reading unbounded number of HTTP/2 CONTINUATION frames to cause excessive CPU usage
  46Plan
• CVE-2015-8659The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free
  41Plan
• CVE-2018-1000168nghttp2 version >= 1.10.0 and nghttp2 <= v1.31.0 contains an Improper Input Validation CWE-20 vulnerability in ALTSVC frame handling that ca
  33Monitor
• CVE-2020-11080Denial of service in nghttp2
  32Monitor
• CVE-2026-27135nghttp2 Denial of service: Assertion failure due to the missing state validation
  30Monitor
• CVE-2026-58055nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length
  25Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1function expand(node) {2  return node.children.map(expand);3}

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.