BlackTreeIndependent security intelligence

Full vulnerability report · 2026

CVE-2026-78367High confidence

Rpm: rpmbuild gettarspec() crafted tar member name → macro injection

Red Hat · Red Hat Enterprise Linux 10

7.0HighCVSS 3.1

Recommended action

Within 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Mitigation 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 release	Source package	Vendor state	Fixed version	Evidence
Ubuntu 24.04 LTSnoble · standard archive	`rpm`	Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.	`Not published in this feed`	Canonical record ↗Source updated 8 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-2026-78367 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityrpm: rpmbuild getTarSpec() crafted tar member name → macro injection

70 known affected

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

python3-rpm as a component of Red Hat Enterprise Linux 10
rpm-apidocs as a component of Red Hat Enterprise Linux 10
rpm-build as a component of Red Hat Enterprise Linux 10
rpm-build-libs as a component of Red Hat Enterprise Linux 10
rpm-cron as a component of Red Hat Enterprise Linux 10
rpm-devel as a component of Red Hat Enterprise Linux 10
rpm-libs as a component of Red Hat Enterprise Linux 10
rpm-plugin-audit as a component of Red Hat Enterprise Linux 10
rpm-plugin-dbus-announce as a component of Red Hat Enterprise Linux 10
rpm-plugin-fapolicyd as a component of Red Hat Enterprise Linux 10
rpm-plugin-ima as a component of Red Hat Enterprise Linux 10
rpm-plugin-selinux as a component of Red Hat Enterprise Linux 10

Summary: A vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive, the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the privileges of the user running rpmbuild. This can be exploited when a victim or automated build system processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).
Remediation: Do not process untrusted tarballs with rpmbuild -ta/-tb/-ts. Extract and inspect archives first (reject member names containing }, %, or {), or build from a reviewed .spec outside tarball mode. Prefer isolated builders (mock/container) for any untrusted packaging related work.

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-2026-64885

No EUVD known-exploited evidence

A vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive, the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the privileges of the user running rpmbuild. This can be exploited when a victim or automated build system processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).

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: 7.0 · CVSS 3.1
Advisory evidence: No linked advisory details stored yet

Recommended actionWithin 7 days

High technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Mitigation available

What, why and how

What

Why

Untrusted data can cross into a code-evaluation path and be interpreted as executable instructions.

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

Why

Untrusted data can cross into a code-evaluation path and be interpreted as executable instructions.

How

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.

Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path: local access → Improper Control of Generation of Code ('Code Injection') → 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: High: exploitation depends on specific conditions
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-94 ↗
CWE-94: Improper Control of Generation of Code ('Code Injection'). The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.
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:H/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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.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 executionCWE-94Public exploit reference

Official authority intelligence

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

ENISA EUVD · EUVD-2026-64885Official EUVD mapping

Official EUVD record

BSI · German · WID-SEC-W-2026-2980RPM: Schwachstelle ermöglicht Ausführen von beliebigem Programmcode mit Benutzerrechten

Ein lokaler Angreifer kann eine Schwachstelle in RPM ausnutzen, um beliebigen Programmcode mit Benutzerrechten auszuführen.

Official advisory

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.: Mitigation available
Affected: python3-rpm as a component of Red Hat Enterprise Linux 10; rpm-apidocs as a component of Red Hat Enterprise Linux 10; rpm-build as a component of Red Hat Enterprise Linux 10; rpm-build-libs as a component of Red Hat Enterprise Linux 10; rpm-cron as a component of Red Hat Enterprise Linux 10; rpm-devel as a component of Red Hat Enterprise Linux 10; rpm-libs as a component of Red Hat Enterprise Linux 10; rpm-plugin-audit as a component of Red Hat Enterprise Linux 10; rpm-plugin-dbus-announce as a component of Red Hat Enterprise Linux 10; rpm-plugin-fapolicyd as a component of Red Hat Enterprise Linux 10; rpm-plugin-ima as a component of Red Hat Enterprise Linux 10; rpm-plugin-selinux as a component of Red Hat Enterprise Linux 10; rpm-plugin-syslog as a component of Red Hat Enterprise Linux 10; rpm-plugin-systemd-inhibit as a component of Red Hat Enterprise Linux 10; rpm-sign as a component of Red Hat Enterprise Linux 10; rpm-sign-libs as a component of Red Hat Enterprise Linux 10; rpm.src as a component of Red Hat Enterprise Linux 10; rpm as a component of Red Hat Enterprise Linux 6; rpm-apidocs as a component of Red Hat Enterprise Linux 6; rpm-build as a component of Red Hat Enterprise Linux 6; rpm-cron as a component of Red Hat Enterprise Linux 6; rpm-devel as a component of Red Hat Enterprise Linux 6; rpm-libs as a component of Red Hat Enterprise Linux 6; rpm-python as a component of Red Hat Enterprise Linux 6; rpm.src as a component of Red Hat Enterprise Linux 6; rpm as a component of Red Hat Enterprise Linux 7; rpm-apidocs as a component of Red Hat Enterprise Linux 7; rpm-build as a component of Red Hat Enterprise Linux 7; rpm-build-libs as a component of Red Hat Enterprise Linux 7; rpm-cron as a component of Red Hat Enterprise Linux 7; and 40 more
Fixed: No fixed version is explicitly recorded in the structured CVE data.
Action: No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround: Do not process untrusted tarballs with rpmbuild -ta/-tb/-ts. Extract and inspect archives first (reject member names containing }, %, or {), or build from a reviewed .spec outside tarball mode. Prefer isolated builders (mock/container) for any untrusted packaging related work.

Evidence and provenance

Published 24 Aug 2026 · Last source change 4 Sept 2026, 11:13 UTC · CWE-94 · Improper Control of Generation of Code ('Code 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 2026-08-25

European sourceENISA EUVD · EUVD-2026-64885

Product sourceVendor CSAF · Red Hat Product Security

Remediation sourceVendor CSAF · Red Hat Product Security

CWE sourceCNA

NVD statusNVD awaiting enrichment

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

Material change intelligence

What changed after publication

View recent updates →

25 Aug 2026, 02:20 UTC
ENISA EUVD mappingEUVD-2026-64885 was added to the official ENISA EUVD mapping for this CVE.
Before
not recorded
After
{"euvdId":"EUVD-2026-64885"}
ENISA EUVD ↗
24 Aug 2026, 15:22 UTC
Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
Before
No public exploit
After
Public exploit reference
CVE.org ↗
24 Aug 2026, 13:48 UTC
Catalogue recordCVE added to the BlackTree catalogue.
CNA ↗

2026-08-24CVE published

ENISA EUVD · EUVD-2026-64885↗CVE authority or vendor reference↗CISA Vulnrichment SSVC evidence↗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.