CVE-2023-27586Public exploitNetwork attack vector

SSRF and service hang via default resource fetcher

Published Mar 20, 2023 · Updated Feb 25, 2025

SSRF in Kozea CairoSVG before 2.7.0 allows attackers to send requests to internal or external hosts through crafted SVG resources. The parser retained its default URL fetcher for untrusted image, style, and use references, causing conversion to dereference attacker-controlled locations. An application must pass attacker-controlled SVG data to the converter; a nonresponsive URL or standard-input file reference can hang its processing thread.

CVSS severity9.9
Critical
EPSS probability0.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Kozea CairoSVG before 2.7.0 allows attackers to send requests to internal or external hosts through crafted SVG resources. The parser retained its default URL fetcher for untrusted image, style, and use references, causing conversion to dereference attacker-controlled locations. An application must pass attacker-controlled SVG data to the converter; a nonresponsive URL or standard-input file reference can hang its processing thread.

The record

CVE
CVE-2023-27586
Published
Mar 20, 2023
Updated
Feb 25, 2025
Vendor
Kozea
Product
CairoSVG
Classifications
CWE-20, CWE-918, T1046, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kozea · CairoSVGversion=< 2.7.0

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-918Server-Side Request Forgery (SSRF)
T1046Network Service Scanning
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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