CVE-2026-4424VulnerabilityPublished 16 Apr 2026Updated 5 Nov 2026

Red Hat Security Advisory: libarchive security update

Affects Red Hat libarchiveSource GCVE Database

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Authoritative record:CVE-2026-4424· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 6 Nov 2026, 02:18 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Sources agree

CVSS scores by source
CNA (redhat)	CVSS 3.1	7.5
ADP (redhat-SADP)	CVSS 3.1	7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hat Enterprise Linux 10libarchive	Affected–	Fixed in–
Red Hat Enterprise Linux 10.0 Extended Update Supportlibarchive	Affected–	Fixed in–
Red Hat Enterprise Linux 7 Extended Lifecycle Supportlibarchive	Affected–	Fixed in–
Red Hat Enterprise Linux 8libarchive	Affected–	Fixed in–
Red Hat Enterprise Linux 8.2 Advanced Update Supportlibarchive	Affected–	Fixed in–
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibarchive	Affected–	Fixed in–

AI-suggested

Red Hat has released an official security update for libarchive in Red Hat Enterprise Linux 10 and its Extended Update Support and Extended Life Cycle variants. Users should apply the update as described in the Red Hat advisory RHSA-2026:8492 to remediate this vulnerability. No additional mitigation steps are required beyond applying the official patch.

Description

A security vulnerability (CVE-2026-4424) in the libarchive library allows information disclosure via a heap out-of-bounds read during RAR archive processing. Libarchive is widely used for handling various archive formats in utilities like bsdtar and scripting language bindings. Red Hat has issued an important security update for libarchive in Red Hat Enterprise Linux 10 to address this issue.

Impact

The vulnerability allows an attacker to potentially read sensitive information from memory due to a heap out-of-bounds read during RAR archive processing. This could lead to unauthorized disclosure of information. There are no known exploits in the wild at this time.

Summary

The libarchive programming library, which supports multiple streaming archive formats including GNU tar, cpio, and ISO 9660, contains a vulnerability identified as CVE-2026-4424. This vulnerability involves an information disclosure caused by a heap out-of-bounds read when processing RAR archives. Red Hat Product Security has rated this update as important and released patches for Red Hat Enterprise Linux 10 and its variants. The advisory references a fix available in libarchive version 3.7.7-8.el10_1 and related packages.

CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 02:18 UTC

WeaknessesCWE-125

Technical details

References

Community reviews

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