CVE-2026-22903

CRITICAL

An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it t...

Affects 0 products across 2 vendors.

BCS7.32
CVSS 3.19.8
EPSS0.7%
Percentile48th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-121: Stack-Based Buffer Overflow

Buffer overflow corrupting the program stack, typically overwriting the return address for code execution.

◆ SAGE Intelligence — CITED Relevance Research Team

An unauthenticated remote attacker can exploit a stack buffer overflow vulnerability in a modified lighttpd server by sending a crafted HTTP request with an overly long SESSIONID cookie, potentially leading to remote code execution.

BSID: BS-2026-GLOBAL-070199-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2026-22903?
An unauthenticated remote attacker can exploit a stack buffer overflow vulnerability in a modified lighttpd server by sending a crafted HTTP request with an overly long SESSIONID cookie, potentially leading to remote code execution.
What is the CVSS score for CVE-2026-22903?
CVE-2026-22903 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 0.7%.
Is CVE-2026-22903 actively exploited?
No confirmed active exploitation of CVE-2026-22903 as of 2026-05-30.
How do I remediate CVE-2026-22903?
Priority: IMMEDIATE.
What systems are affected by CVE-2026-22903?
CVE-2026-22903 affects: Lighttpd, Modified.
Vulnerability Details
CVE IDCVE-2026-22903
BSIDBS-2026-GLOBAL-070199-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2026-02-09
Last Modified2026-04-15
ICS Relevance15%
Weakness (CWE)
Stack-Based Buffer Overflow
SourceNVD
Official Description

An unauthenticated remote attacker can send a crafted HTTP request containing an overly long SESSIONID cookie. This can trigger a stack buffer overflow in the modified lighttpd server, causing it to crash and potentially enabling remote code execution due to missing stack protections.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability is triggered by an overly long SESSIONID cookie in an HTTP request, which causes a stack buffer overflow in the modified lighttpd server. This can lead to a server crash and, due to missing stack protections, may allow for remote code execution.

Exploitation Likelihood: CRITICAL

Affected Products
VendorProductFixed Version
Lighttpd — —
Modified — —
Remediation

No patch URL on record. Monitor vendor security advisories directly.

Threat Intelligence
● Threat Intelligence Validated: August 2026 | Threat Age: 180 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hashbf25dd10e45f32c96421b1276b1accc93500c63657dd63180c6e05f9b66f7efab005b13de6fa1029993a514e84317bcc1bc60cb355ce9d1401b704dd6b628d7a
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