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TI-2026-40040 Aliases CVE-2026-55484GHSA-hr6j-w4mw-g9mj

Improper check for unusual conditions in guno1928 alos-http

Priority HIGH 72CWE-248Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-248.

Summary

ALOS HTTP is a Linux-first Go web framework and application server built around a custom networking stack. Prior to 0.0.0-20260617230736-314b6783e196, core/utils.go::sanitizeRequestPath calls splitPathQuery on a request path beginning with a question mark and then performs the unchecked p[0] access without checking whether the resulting path is empty. An unauthenticated client can send a malformed request such as a question-mark-only path through h1_plain.go::ParseH1RequestHead, hpack.go::decodeSimpleGetPathHTTPSRequest, hpack.go::observeHeader, or h3_conn.go::handleRequestStream, causing an out-of-bounds panic before core.Recovery() middleware runs and terminating the server process. This issue is fixed in pseudo-version 0.0.0-20260617230736-314b6783e196.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00488 42nd percentileScored 2026-11-07
Fix Fixed alos-http (guno1928): 0.0.0-20260617230736-314b6783e196github.com/guno1928/alos-http (Go): 0.0.0-20260617230736-314b6783e196

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
guno1928alos-httpbefore 0.0.0-20260617230736-314b6783e1960.0.0-20260617230736-314b6783e196Patch availableCNA
—github.com/guno1928/alos-http (Go)before 0.0.0-20260617230736-314b6783e1960.0.0-20260617230736-314b6783e196Patch availableGHSA-hr6j-w4mw-g9mj
  • alos-http Vendorguno1928 Affected before 0.0.0-20260617230736-314b6783e196 Fixed in 0.0.0-20260617230736-314b6783e196 Patch available CNA
  • github.com/guno1928/alos-http (Go) Vendor— Affected before 0.0.0-20260617230736-314b6783e196 Fixed in 0.0.0-20260617230736-314b6783e196 Patch available GHSA-hr6j-w4mw-g9mj

Remediation

  • Fix · CNA alos-http (guno1928) Fixed in 0.0.0-20260617230736-314b6783e196
  • Fix · GHSA-hr6j-w4mw-g9mj github.com/guno1928/alos-http (Go) Fixed in 0.0.0-20260617230736-314b6783e196 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55484
  2. 2026-10-03 Alias added: GHSA-hr6j-w4mw-g9mj

References

Other 3

Sources

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