CVE-2024-25885Public exploitNetwork attack vector

Service interruption via backtracking RGB color regex

Published Oct 8, 2024 · Updated Jul 5, 2026

Regular expression denial of service in xhtml2pdf 0.2.13 allows remote attackers to interrupt PDF conversion via crafted HTML. The getColor function in xhtml2pdf/util.py searches unbounded color text with rgb_re, whose repeated wildcard and digit groups trigger excessive backtracking on a long malformed RGB value. Exploitation requires processing attacker-controlled HTML and consumes CPU during color parsing, delaying or hanging PDF conversion without reported data access or modification.

CVSS severity7.5
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in xhtml2pdf 0.2.13 allows remote attackers to interrupt PDF conversion via crafted HTML. The getColor function in xhtml2pdf/util.py searches unbounded color text with rgb_re, whose repeated wildcard and digit groups trigger excessive backtracking on a long malformed RGB value. Exploitation requires processing attacker-controlled HTML and consumes CPU during color parsing, delaying or hanging PDF conversion without reported data access or modification.

The record

CVE
CVE-2024-25885
Published
Oct 8, 2024
Updated
Jul 5, 2026
Vendor
xhtml2pdf
Product
xhtml2pdf
Classifications
CWE-1333, CAPEC-492, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Jul 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0.2.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

xhtml2pdf · xhtml2pdfversion=0.2.13

Published CVSS scores

5.5GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CAPEC-492Regular Expression Exponential Blowup
T1499.004Application 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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