PatchSiren cyber security CVE debrief

CVE-2026-59246 elixir-mint CVE debrief

CVE-2026-59246: A remote HTTP/2 server can exhaust memory on the client host and cause a denial of service due to an allocation of resources without limits in Elixir Mint. The vulnerability exists in the Mint.HTTP2.handle_continuation/3 function, which accumulates header-block fragments carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting. A malicious HTTP/2 server can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely, leading to memory exhaustion and eventual out-of-memory termination.

Vendor: elixir-mint
Product: mint
CVSS: MEDIUM 6.3
CISA KEV: Not listed in stored evidence
Original CVE published: 2026-07-14
Original CVE updated: 2026-07-14
Advisory published: 2026-07-14
Advisory updated: 2026-07-14

Who should care

Users of Elixir Mint, particularly those who handle HTTP/2 requests, should be aware of this vulnerability and take steps to mitigate it. This includes updating to a patched version of Mint (1.9.2 or later) and implementing compensating controls to detect and prevent potential attacks.

Technical summary

The vulnerability exists in the Mint.HTTP2.handle_continuation/3 function, which accumulates header-block fragments carried by each HTTP/2 CONTINUATION frame into a growing conn.headers_being_processed nesting. A malicious HTTP/2 server can open a stream by sending a HEADERS frame without END_HEADERS and then stream zero-length CONTINUATION frames indefinitely, leading to memory exhaustion and eventual out-of-memory termination. The issue affects mint from 0.1.0 before 1.9.2.

Defensive priority

High

Recommended defensive actions

Update to a patched version of Mint (1.9.2 or later)
Implement compensating controls to detect and prevent potential attacks
Monitor for suspicious HTTP/2 traffic
Perform regular security audits and vulnerability assessments
Review and update incident response plans
Conduct vulnerability scanning and penetration testing
Track and analyze network traffic for anomalies

Evidence notes

The CVE record was published on 2026-07-14T09:16:41.727Z and has not been modified since then. The NVD entry is currently Received. The vulnerability has a CVSS score of 6.3 and a severity of MEDIUM. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems, review vendor guidance, and monitor for potential attacks.

Sources and references

Verified primary and authoritative sources

CVE-2026-59246 CVE Program record
Publisher, destination, and source semantics verified

URL: https://www.cve.org/CVERecord?id=CVE-2026-59246

CVE Program - Official CVE Program record with source-provided CVE metadata.
CVE-2026-59246 NVD vulnerability detail
Publisher, destination, and source semantics verified

URL: https://nvd.nist.gov/vuln/detail/CVE-2026-59246

NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Source reference
Unverified legacy reference

URL: https://cna.erlef.org/cves/CVE-2026-59246.html

6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Source reference
Unverified legacy reference

URL: https://github.com/elixir-mint/mint/commit/5779de1666344b32aefc4354184ea07f902f73ce

6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Source reference
Unverified legacy reference

URL: https://github.com/elixir-mint/mint/security/advisories/GHSA-8pf6-g464-h6h9

6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Source reference
Unverified legacy reference

URL: https://osv.dev/vulnerability/EEF-CVE-2026-59246

6b3ad84c-e1a6-4bf7-a703-f496b71e49db

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.