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Full vulnerability report · 2026
CVE-2026-55971High confidence

Apache Thrift: C++ ZLIB heap buffer overflow (write) in THeaderTransport::untransform()

Apache Software Foundation · Apache Thrift

9.3CriticalCVSS 4.0
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

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 archivethriftUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical record ↗Source updated 10 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-2026-55971 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitythrift: Apache Thrift C++ bindings: Remote code execution via heap-based buffer overflow
142 fixed

The vendor explicitly identifies these products or versions as containing the fix.

  • perl-thrift-0:0.24.0-1.el9ai.noarch as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-debuginfo-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-debuginfo-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-debuginfo-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • python3-thrift-debuginfo-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • thrift-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • thrift-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
  • thrift-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9
Summary
A flaw was found in Apache Thrift C++ bindings. A remote, unauthenticated attacker can exploit a heap-based buffer overflow vulnerability without user interaction. This can lead to arbitrary code execution, allowing the attacker to gain full control over the affected system, compromise data, and cause a denial of service.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, 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-2026-49155

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 actionWithin 72 hours

Critical technical impact with a remotely reachable, unauthenticated path; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue.

What

Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Heap-based Buffer Overflow vulnerability in Apache Thrift C++ bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue.

Why

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. 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 → Heap-based Buffer Overflow → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
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-122 ↗

CWE-122: Heap-based Buffer Overflow. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

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:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/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.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VAHighVulnerable-system availability: A successful attack can cause a major loss.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.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.
NetworkUnauthenticatedCWE-122
A

Official authority intelligence

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

BSI · German · WID-SEC-W-2026-2629Red Hat Enterprise Linux AI: Schwachstelle ermöglicht Codeausführung

Ein lokaler Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux AI ausnutzen, um beliebigen Programmcode auszuführen und dadurch möglicherweise die vollständige Kontrolle über das betroffene System zu erlangen, Daten zu kompromittieren oder einen Denial-of-Service-Zustand herbeizuführen.

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
< 0.24.0
Fixed
perl-thrift-0:0.24.0-1.el9ai.noarch as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-debuginfo-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-debuginfo-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-debuginfo-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; python3-thrift-debuginfo-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-0:0.24.0-1.el9ai.src as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debuginfo-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debuginfo-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debuginfo-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debuginfo-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debugsource-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debugsource-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debugsource-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-debugsource-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-debuginfo-0:0.24.0-1.el9ai.aarch64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-debuginfo-0:0.24.0-1.el9ai.ppc64le as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-debuginfo-0:0.24.0-1.el9ai.s390x as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; thrift-devel-debuginfo-0:0.24.0-1.el9ai.x86_64 as a component of Red Hat Enterprise Linux AI 3.4 for RHEL 9; and 112 more
Action
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, 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 27 Jul 2026 · Last source change 28 Jul 2026, 03:55 UTC · CWE-122 · Heap-based Buffer Overflow

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-2026-49155
Product sourceCNA
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

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-2026-49155↗Vendor CSAF · Red Hat Product Security↗Vendor advisory↗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-2026-55971 · cve.blacktree.nl