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Public proof of conceptFix available

CVE-2023-23924

A public proof of concept exists; no exploitation attested.

  • Published2023-02-01
  • Fixed in2.0.2
  • WeaknessCWE-551 · CWE-863

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can exploit the vulnerability to call arbitrary URL with arbitrary protocols, if they can provide a SVG file to dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, that will lead to the very least to an arbitrary file deletion and even remote code execution, depending on classes that are available.

Timeline

dates in UTC
  1. 2023-02-0100:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-23924?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-23924?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

OSV · NVD
dompdf/dompdf
BranchAffectedFixed in
2.0< 2.0.22.0.2
Dompdf project dompdf
BranchAffectedFixed in
2.0= 2.0.1no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • dompdf
    Affected
    • = < 2.0.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2023-01-31

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • dompdf/dompdfTuxCare:Packagistfrom 0.8.6 · fixed in 0.8.6-p1+tuxcare
  • dompdf/dompdfTuxCare:Packagistfrom v1.2.2 · fixed in 1.2.2-p1+tuxcare

Full record on NVD

Fix

  1. Update dompdf/dompdf to 2.0.2

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedmotikan2010/CVE-2023-23924
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-03-10
  • OpenCVESSVC decisionpoc—
  • CNACVSS 3.110known since 2026-10-23
  • NVDCVSS 3.19.8read 2026-10-23
  • CNAweakness (CWE)CWE-551known since 2026-10-23
  • NVDweakness (CWE)CWE-863read 2026-10-23
  • FIRST EPSSEPSS score3.6 %2026-11-03
  • PoC-in-GitHubproof of concept1read 2026-11-03
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryCRITICAL2023-02-01

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2023-02-01
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-3cw5-7cxw-v5qg

Frequently asked questions

What is CVE-2023-23924?

Dompdf is an HTML to PDF converter. The URI validation on dompdf 2.0.1 can be bypassed on SVG parsing by passing `<image>` tags with uppercase letters. This may lead to arbitrary object unserialize on PHP < 8, through the `phar` URL wrapper. An attacker can exploit the vulnerability to call arbitrary URL with arbitrary protocols, if they can provide a SVG file to dompdf. In PHP versions before 8.0.0, it leads to arbitrary unserialize, that will lead to the very least to an arbitrary file deletion and even remote code execution, depending on classes that are available.

Is CVE-2023-23924 actively exploited?

A proof-of-concept exploit exists for CVE-2023-23924, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-23924?

CVE-2023-23924 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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