BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2026
CVE-2025-15282High confidence

Header injection via newlines in data URL mediatype

Python Software Foundation · CPython

6.0MediumCVSS 4.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
Distribution package intelligence

Ubuntu vendor package status

Canonical’s release and source-package findings are shown separately from local repository availability.

1 package state
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Ubuntu releaseSource packageVendor stateFixed versionEvidence
Ubuntu 24.04 LTSnoble · standard archivepython3.12Vendor fix publishedCanonical reports that a fixed source package version has been published. Repository candidate availability is not checked by BlackTree.3.12.3-1ubuntu0.11Canonical record ↗Source updated 11 Sept 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2025-15282 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycpython: Header injection via newlines in data URL mediatype in Python
193 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • firefox as a component of Red Hat Enterprise Linux 10
  • firefox.src as a component of Red Hat Enterprise Linux 10
  • python3.14 as a component of Red Hat Enterprise Linux 10
  • python3.14-debug as a component of Red Hat Enterprise Linux 10
  • python3.14-devel as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-debug as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-devel as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-idle as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-libs as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-test as a component of Red Hat Enterprise Linux 10
  • python3.14-freethreading-tkinter as a component of Red Hat Enterprise Linux 10
Summary
Missing newline filtering has been discovered in Python. User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-206305

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

What

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

Why

The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

Why

The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Neutralization of CRLF Sequences ('CRLF Injection') → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-93 ↗

CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'). The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATPresentAttack requirements: A particular deployment or execution condition must be present.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.VCNoneVulnerable-system confidentiality: No direct loss is represented by this metric.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SILowSubsequent-system integrity: A successful attack can cause a limited loss.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-93
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-2189Dell PowerProtect Data Domain: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell PowerProtect Data Domain ausnutzen, um seine Privilegien zu erhöhen um beliebigen Programmcode auszuführen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen, um einen Cross-Site Scripting Angriff durchzuführen, um Informationen offenzulegen, und um Dateien zu manipulieren.

Official advisory ↗
BSI · German · WID-SEC-2026-0778Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Dell Secure Connect Gateway Policy Manager ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

Official advisory ↗
BSI · German · WID-SEC-2026-0209Cpython: Mehrere Schwachstellen

Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Cpython ausnutzen, um Dateien zu manipulieren oder beliebigen Code auszuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260121Security Bulletin 21 Jan 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 21 Jan 2026, published on 21 January 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0627Multiples vulnérabilités dans les produits Splunk

d?id=CVE-2025-11226 Référence CVE CVE-2025-11468 https://www.cve.org/CVERecord?id=CVE-2025-11468 Référence CVE CVE-2025-12084 https://www.cve.org/CVERecord?id=CVE-2025-12084 Référence CVE CVE-2025-12183 https://www.cve.org/CVERecord?id=CVE-2025-12183 Référence CVE CVE-2025-13151 https://www.cve.org/CVERecord?id=CVE-2025-13151 Référence CVE CVE-2025-13836 https://www.cve.org/CVERecord?id=CVE-2025-13836 Référence CVE CVE-2025-14174 https://www.cve.org/CVERecord?id=CVE-2025-14174 Référence CVE CVE-2025-14819 https://www.cve.org/CVERecord?id=CVE-2025-14819 Référence CVE CVE-2025-14831 https://www.cve.org/CVERecord?id=CVE-2025-14831 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15467 https://www.cve.org/CVERecord?id=CVE-2025-15467 Référence CVE CVE-2025-15468 https://www.cve.org/CVERecord?id=CVE-2025-15468 Référence CVE CVE-2025-1795 https://www.cve.org/CVERecord?id=CVE-2025-1795 Référence CVE CVE-2025-1948 https://www.cve.org/CVERecord?id=CVE-2025-1948 Référence CVE CVE-2025-22868 https://www.cve.org/CVERecord?id=CVE-2025-22868 Référence CVE CVE-2025-22869 https://www.cve.org/CVERecord?id=CVE-2025-22869 Référence CVE CVE-2025-22871 https://www.cve.org/CVERecord?id=CVE-2025-22871 Référence CVE CVE-2025-22872 https://www.cve.org/CVERecord?id=CVE-

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0556Multiples vulnérabilités dans les produits VMware

d?id=CVE-2025-12817 Référence CVE CVE-2025-12818 https://www.cve.org/CVERecord?id=CVE-2025-12818 Référence CVE CVE-2025-13462 https://www.cve.org/CVERecord?id=CVE-2025-13462 Référence CVE CVE-2025-13836 https://www.cve.org/CVERecord?id=CVE-2025-13836 Référence CVE CVE-2025-13837 https://www.cve.org/CVERecord?id=CVE-2025-13837 Référence CVE CVE-2025-14009 https://www.cve.org/CVERecord?id=CVE-2025-14009 Référence CVE CVE-2025-14819 https://www.cve.org/CVERecord?id=CVE-2025-14819 Référence CVE CVE-2025-14831 https://www.cve.org/CVERecord?id=CVE-2025-14831 Référence CVE CVE-2025-15281 https://www.cve.org/CVERecord?id=CVE-2025-15281 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15366 https://www.cve.org/CVERecord?id=CVE-2025-15366 Référence CVE CVE-2025-15367 https://www.cve.org/CVERecord?id=CVE-2025-15367 Référence CVE CVE-2025-1795 https://www.cve.org/CVERecord?id=CVE-2025-1795 Référence CVE CVE-2025-2099 https://www.cve.org/CVERecord?id=CVE-2025-2099 Référence CVE CVE-2025-21493 https://www.cve.org/CVERecord?id=CVE-2025-21493 Référence CVE CVE-2025-21499 https://www.cve.org/CVERecord?id=CVE-2025-21499 Référence CVE CVE-2025-21574 https://www.cve.org/CVERecord?id=CVE-2025-21574 Référence CVE CVE-2025-21575 https://www.cve.org/CVERecord?id=CVE-

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0315Multiples vulnérabilités dans les produits VMware

d?id=CVE-2025-13034 Référence CVE CVE-2025-13462 https://www.cve.org/CVERecord?id=CVE-2025-13462 Référence CVE CVE-2025-13836 https://www.cve.org/CVERecord?id=CVE-2025-13836 Référence CVE CVE-2025-13837 https://www.cve.org/CVERecord?id=CVE-2025-13837 Référence CVE CVE-2025-14017 https://www.cve.org/CVERecord?id=CVE-2025-14017 Référence CVE CVE-2025-14524 https://www.cve.org/CVERecord?id=CVE-2025-14524 Référence CVE CVE-2025-14819 https://www.cve.org/CVERecord?id=CVE-2025-14819 Référence CVE CVE-2025-15079 https://www.cve.org/CVERecord?id=CVE-2025-15079 Référence CVE CVE-2025-15224 https://www.cve.org/CVERecord?id=CVE-2025-15224 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15366 https://www.cve.org/CVERecord?id=CVE-2025-15366 Référence CVE CVE-2025-15367 https://www.cve.org/CVERecord?id=CVE-2025-15367 Référence CVE CVE-2025-22870 https://www.cve.org/CVERecord?id=CVE-2025-22870 Référence CVE CVE-2025-22872 https://www.cve.org/CVERecord?id=CVE-2025-22872 Référence CVE CVE-2025-24358 https://www.cve.org/CVERecord?id=CVE-2025-24358 Référence CVE CVE-2025-27219 https://www.cve.org/CVERecord?id=CVE-2025-27219 Référence CVE CVE-2025-27220 https://www.cve.org/CVERecord?id=CVE-2025-27220 Référence CVE CVE-2025-29923 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0218Multiples vulnérabilités dans les produits VMware

d?id=CVE-2025-14017 Référence CVE CVE-2025-14087 https://www.cve.org/CVERecord?id=CVE-2025-14087 Référence CVE CVE-2025-14104 https://www.cve.org/CVERecord?id=CVE-2025-14104 Référence CVE CVE-2025-14512 https://www.cve.org/CVERecord?id=CVE-2025-14512 Référence CVE CVE-2025-14524 https://www.cve.org/CVERecord?id=CVE-2025-14524 Référence CVE CVE-2025-14819 https://www.cve.org/CVERecord?id=CVE-2025-14819 Référence CVE CVE-2025-15079 https://www.cve.org/CVERecord?id=CVE-2025-15079 Référence CVE CVE-2025-15224 https://www.cve.org/CVERecord?id=CVE-2025-15224 Référence CVE CVE-2025-15281 https://www.cve.org/CVERecord?id=CVE-2025-15281 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15366 https://www.cve.org/CVERecord?id=CVE-2025-15366 Référence CVE CVE-2025-15367 https://www.cve.org/CVERecord?id=CVE-2025-15367 Référence CVE CVE-2025-15467 https://www.cve.org/CVERecord?id=CVE-2025-15467 Référence CVE CVE-2025-1632 https://www.cve.org/CVERecord?id=CVE-2025-1632 Référence CVE CVE-2025-1795 https://www.cve.org/CVERecord?id=CVE-2025-1795 Référence CVE CVE-2025-21861 https://www.cve.org/CVERecord?id=CVE-2025-21861 Référence CVE CVE-2025-21883 https://www.cve.org/CVERecord?id=CVE-2025-21883 Référence CVE CVE-2025-21884 https://www.cve.org/CVERecord?id=CVE-

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0209Multiples vulnérabilités dans les produits VMware

d?id=CVE-2025-12818 Référence CVE CVE-2025-13151 https://www.cve.org/CVERecord?id=CVE-2025-13151 Référence CVE CVE-2025-13601 https://www.cve.org/CVERecord?id=CVE-2025-13601 Référence CVE CVE-2025-13836 https://www.cve.org/CVERecord?id=CVE-2025-13836 Référence CVE CVE-2025-13837 https://www.cve.org/CVERecord?id=CVE-2025-13837 Référence CVE CVE-2025-14087 https://www.cve.org/CVERecord?id=CVE-2025-14087 Référence CVE CVE-2025-14512 https://www.cve.org/CVERecord?id=CVE-2025-14512 Référence CVE CVE-2025-14831 https://www.cve.org/CVERecord?id=CVE-2025-14831 Référence CVE CVE-2025-15281 https://www.cve.org/CVERecord?id=CVE-2025-15281 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15366 https://www.cve.org/CVERecord?id=CVE-2025-15366 Référence CVE CVE-2025-15367 https://www.cve.org/CVERecord?id=CVE-2025-15367 Référence CVE CVE-2025-15467 https://www.cve.org/CVERecord?id=CVE-2025-15467 Référence CVE CVE-2025-15468 https://www.cve.org/CVERecord?id=CVE-2025-15468 Référence CVE CVE-2025-15469 https://www.cve.org/CVERecord?id=CVE-2025-15469 Référence CVE CVE-2025-21861 https://www.cve.org/CVERecord?id=CVE-2025-21861 Référence CVE CVE-2025-22058 https://www.cve.org/CVERecord?id=CVE-2025-22058 Référence CVE CVE-2025-22868 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0199Multiples vulnérabilités dans les produits VMware

d?id=CVE-2025-12084 Référence CVE CVE-2025-12817 https://www.cve.org/CVERecord?id=CVE-2025-12817 Référence CVE CVE-2025-12818 https://www.cve.org/CVERecord?id=CVE-2025-12818 Référence CVE CVE-2025-13151 https://www.cve.org/CVERecord?id=CVE-2025-13151 Référence CVE CVE-2025-13601 https://www.cve.org/CVERecord?id=CVE-2025-13601 Référence CVE CVE-2025-13836 https://www.cve.org/CVERecord?id=CVE-2025-13836 Référence CVE CVE-2025-13837 https://www.cve.org/CVERecord?id=CVE-2025-13837 Référence CVE CVE-2025-14104 https://www.cve.org/CVERecord?id=CVE-2025-14104 Référence CVE CVE-2025-15281 https://www.cve.org/CVERecord?id=CVE-2025-15281 Référence CVE CVE-2025-15282 https://www.cve.org/CVERecord?id=CVE-2025-15282 Référence CVE CVE-2025-15366 https://www.cve.org/CVERecord?id=CVE-2025-15366 Référence CVE CVE-2025-15367 https://www.cve.org/CVERecord?id=CVE-2025-15367 Référence CVE CVE-2025-15467 https://www.cve.org/CVERecord?id=CVE-2025-15467 Référence CVE CVE-2025-15468 https://www.cve.org/CVERecord?id=CVE-2025-15468 Référence CVE CVE-2025-15469 https://www.cve.org/CVERecord?id=CVE-2025-15469 Référence CVE CVE-2025-21502 https://www.cve.org/CVERecord?id=CVE-2025-21502 Référence CVE CVE-2025-21587 https://www.cve.org/CVERecord?id=CVE-2025-21587 Référence CVE CVE-2025-21861 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0067Multiples vulnérabilités dans Python

De multiples vulnérabilités ont été découvertes dans CPython. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une atteinte à l'intégrité des données et un contournement de la politique de sécurité.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 20 Jan 2026 · Last source change 3 Mar 2026, 14:42 UTC · CWE-93 · Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-206305
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD not scheduled

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2025-206305↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-15282 · cve.blacktree.nl