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Full vulnerability report · 2026
CVE-2026-4775High confidence

Libtiff: libtiff: arbitrary code execution or denial of service via signed integer overflow in tiff file processing

Red Hat · Red Hat Enterprise Linux 10

Official source article: Red Hat RHSA-2026:12265 ↗. Check the applicable product and release in the original source.

7.8HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.38% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Alpine, Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

8 package states
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.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · communityqt6-qtwebengineVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.6.10.3-r3Alpine Security Database ↗Source updated 11 Sep 2026
Debian trixietrixie · sourcetiffVendor fix publishedDebian records a fixed source-package version for this release.4.7.0-3+deb13u2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcetiffVendor fix publishedDebian records a fixed source-package version for this release.4.5.0-6+deb12u4Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcetiffVendor fix publishedDebian records a fixed source-package version for this release.4.7.1-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcetiffVendor fix publishedDebian records a fixed source-package version for this release.4.7.1-2Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appsqtwebengine-opensource-srcUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appstexmakerUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivetiffUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 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-2026-4775 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitylibtiff: libtiff: Arbitrary code execution or denial of service via signed integer overflow in TIFF file processing
4 known affected

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

  • libtiff as a component of Red Hat Enterprise Linux 6
  • libtiff-devel as a component of Red Hat Enterprise Linux 6
  • libtiff-static as a component of Red Hat Enterprise Linux 6
  • libtiff.src as a component of Red Hat Enterprise Linux 6
Summary
A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.
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.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

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-2026-14901

No EUVD known-exploited evidence

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

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
7.8 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

What

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

What

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Why

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

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
local access → Integer Overflow or Wraparound → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-190 ↗

CWE-190: Integer Overflow or Wraparound. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
UnauthenticatedRemote code executionDenial of serviceCWE-190
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-14901Official EUVD mapping

A flaw was found in the libtiff library. A remote attacker could exploit a signed integer overflow vulnerability in the putcontig8bitYCbCr44tile function by providing a specially crafted TIFF file. This flaw can lead to an out-of-bounds heap write due to incorrect memory pointer calculations, potentially causing a denial of service (application crash) or arbitrary code execution.

Official EUVD record ↗
BSI · German · WID-SEC-2026-1031libTIFF: Schwachstelle ermöglicht Codeausführung und DoS

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in libTIFF ausnutzen, um möglicherweise beliebigen Code auszuführen oder einen Denial-of-Service-Zustand herbeizuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260325Security Bulletin 25 Mar 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 25 Mar 2026, published on 25 March 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-012074Debian等の複数ベンダの製品における整数オーバーフローの脆弱性

libtiffライブラリに脆弱性が発見されました。リモートの攻撃者は、特別に細工されたTIFFファイルを提供することで、putcontig8bitYCbCr44tile関数における符号付き整数オーバーフローの脆弱性を悪用する可能性があります。この脆弱性は、メモリポインタの計算ミスによってヒープの範囲外書き込みを引き起こし、サービス拒否（アプリケーションのクラッシュ）や任意のコード実行を招く恐れがあります。

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. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 24 Mar 2026 · Last source change 2 Oct 2026, 02:05 UTC · CWE-190 · Integer Overflow or Wraparound

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-2026-14901
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Enterprise Linux 10: 0:4.6.0-6.el10_1.3 < *, 0:4.6.0-8.el10_2.1 < *; Red Hat Enterprise Linux 10.0 Extended Update Support: 0:4.6.0-6.el10_0.3 < *; Red Hat Enterprise Linux 7 Extended Lifecycle Support: 0:3.9.4-12.el7_9.2 < *, 0:4.0.3-35.el7_9.2 < *; Red Hat Enterprise Linux 8: 0:4.0.9-37.el8_10 < *, 0:3.9.4-15.el8_10 < *, 0:4.0.9-4.el8_10 < *; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Telecommunications Update Service: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.8 Telecommunications Update Service: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 9: 0:4.4.0-15.el9_7.3 < *, 0:4.4.0-18.el9_8 < *; Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: 0:4.2.0-3.el9_0.3 < *; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: 0:4.4.0-8.el9_2.5 < *; Red Hat Enterprise Linux 9.4 Extended Update Support: 0:4.4.0-12.el9_4.5 < *; Red Hat Enterprise Linux 9.6 Extended Update Support: 0:4.4.0-13.el9_6.4 < *; Red Hat AI Inference Server 3.2: 1780681984 < *; Red Hat AI Inference Server 3.3: 1782352950 < *, 1782352919 < *, 1782353093 < *, 1782352847 < *; Red Hat Hardened Images: 4.7.1-2.2.hum1 < *, 4.7.1-2.3.hum1 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Enterprise Linux 10: 0:4.6.0-6.el10_1.3 < *, 0:4.6.0-8.el10_2.1 < *; Red Hat Enterprise Linux 10.0 Extended Update Support: 0:4.6.0-6.el10_0.3 < *; Red Hat Enterprise Linux 7 Extended Lifecycle Support: 0:3.9.4-12.el7_9.2 < *, 0:4.0.3-35.el7_9.2 < *; Red Hat Enterprise Linux 8: 0:4.0.9-37.el8_10 < *, 0:3.9.4-15.el8_10 < *, 0:4.0.9-4.el8_10 < *; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Telecommunications Update Service: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.8 Telecommunications Update Service: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 9: 0:4.4.0-15.el9_7.3 < *, 0:4.4.0-18.el9_8 < *; Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: 0:4.2.0-3.el9_0.3 < *; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: 0:4.4.0-8.el9_2.5 < *; Red Hat Enterprise Linux 9.4 Extended Update Support: 0:4.4.0-12.el9_4.5 < *; Red Hat Enterprise Linux 9.6 Extended Update Support: 0:4.4.0-13.el9_6.4 < *; Red Hat AI Inference Server 3.2: 1780681984 < *; Red Hat AI Inference Server 3.3: 1782352950 < *, 1782352919 < *, 1782353093 < *, 1782352847 < *; Red Hat Hardened Images: 4.7.1-2.2.hum1 < *, 4.7.1-2.3.hum1 < *; Red Hat OpenShift AI 3.4: 1790703542 < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 0:4.6.0-6.el10_1.3 < *; 0:4.6.0-8.el10_2.1 < *; 0:4.6.0-6.el10_0.3 < *; 0:3.9.4-12.el7_9.2 < *; 0:4.0.3-35.el7_9.2 < *; 0:4.0.9-37.el8_10 < *; 0:3.9.4-15.el8_10 < *; 0:4.0.9-4.el8_10 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Enterprise Linux 10: 0:4.6.0-6.el10_1.3 < *, 0:4.6.0-8.el10_2.1 < *; Red Hat Enterprise Linux 10.0 Extended Update Support: 0:4.6.0-6.el10_0.3 < *; Red Hat Enterprise Linux 7 Extended Lifecycle Support: 0:3.9.4-12.el7_9.2 < *, 0:4.0.3-35.el7_9.2 < *; Red Hat Enterprise Linux 8: 0:4.0.9-37.el8_10 < *, 0:3.9.4-15.el8_10 < *, 0:4.0.9-4.el8_10 < *; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On: 0:4.0.9-18.el8_4.2 < *, 0:3.9.4-13.el8_4.2 < *; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Telecommunications Update Service: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions: 0:4.0.9-21.el8_6.2 < *, 0:3.9.4-13.el8_6.2 < *; Red Hat Enterprise Linux 8.8 Telecommunications Update Service: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions: 0:4.0.9-29.el8_8.2 < *, 0:3.9.4-13.el8_8.2 < *; Red Hat Enterprise Linux 9: 0:4.4.0-15.el9_7.3 < *, 0:4.4.0-18.el9_8 < *; Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions: 0:4.2.0-3.el9_0.3 < *; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions: 0:4.4.0-8.el9_2.5 < *; Red Hat Enterprise Linux 9.4 Extended Update Support: 0:4.4.0-12.el9_4.5 < *; Red Hat Enterprise Linux 9.6 Extended Update Support: 0:4.4.0-13.el9_6.4 < *; Red Hat AI Inference Server 3.2: 1780681984 < *; Red Hat AI Inference Server 3.3: 1782352950 < *, 1782352919 < *, 1782353093 < *, 1782352847 < *; Red Hat Hardened Images: 4.7.1-2.2.hum1 < *, 4.7.1-2.3.hum1 < *
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-14901↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:12265↗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-2026-4775 · cve.blacktree.nl