CVE-2026-17591

Libarchive: libarchive: use-after-free via aliased mac metadata copy

CVSS score

3.6

EPSS probability

%0.1

Risk score

0.0

Published

2 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

A patch is available only for some products or versions

Kanıt listesindeki ürün ve sürüm eşleşmesini kontrol edin; bazı varyantlar hâlâ etkileniyor olabilir.

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

CVE-2026-17591: Libarchive Memory Flaw

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CVE-2026-17591 in the libarchive library can lead to a denial of service or potential information disclosure due to a use-after-free vulnerability in the archive entry copy function.

Why does it matter?

This vulnerability allows attackers to crash a vulnerable application or read uninitialized memory data.

What should be done?

Follow vendor advisories
Apply available updates
Audit application inputs

Chain of evidence and sources2 verified claims

CVE-2026-17591, archive_entry_copy_mac_metadata() fonksiyonundaki bir kullanımdan sonra serbest bırakma hatasından kaynaklanır.

S0 · daybreach-canonical S1 · cvelist

Zafiyet servis dışı kalma veya potansiyel bilgi ifşasına neden olabilir.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential information disclosure due to a use-after-free vulnerability, which occurs when a program reads memory that has already been released. This issue arises when the archive_entry_copy_mac_metadata() function deallocates an internal buffer before completing a data copy. An attacker who can supply input to an application utilizing this function can trigger the flaw to crash the application or read uninitialized memory data.

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

CWE: CWE-416

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-17591 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Red Hat	Red Hat Hardened Images	View
2	Red Hat	Red Hat Enterprise Linux 10	View
3	Red Hat	Red Hat Enterprise Linux 6	View
4	Red Hat	Red Hat Enterprise Linux 7	View
5	Red Hat	Red Hat Enterprise Linux 8	View
6	Red Hat	Red Hat Enterprise Linux 9	View
7	debian	libarchive (sid)	View
8	debian	libarchive (forky)	View
9	debian	libarchive (trixie)	View
10	debian	libarchive (bookworm)	View

Total affected vendors: 2|Products: 10

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
3.6	CVSS V31	LOW	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L	NVD
3.6	CVSS V3_1	LOW	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L	CVE CNA

Patch and Remediation Guide

Solution & Remediation Advisory

Partial patch

2 düzeltme kanıtı bulundu; en az 2 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

debianlibarchive (sid)3.8.9-1

Debian sid: 3.8.9-1

debianlibarchive (forky)3.8.9-1

Debian forky: 3.8.9-1

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-17591 is associated with the following CWEs:

CWE-416: Use After Free

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-17591 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsGerekmiyor

UserGerekiyor

Official Sources and Advisories

RHSA-2026:77775vendor-advisory https://access.redhat.com/security/cve/CVE-2026-17591vendor-advisory RHBZ#2554209vendor-advisory https://github.com/libarchive/libarchive/pull/3318vendor-advisory https://security-tracker.debian.org/tracker/CVE-2026-17591vendor-advisory

CVSS Vector Radar Chart

3.6 / 10

Vulnerability Scoring Details

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

Attack VectorLocal

Attack ComplexityHigh

Privileges RequiredNone required

User Interaction—

Confidentiality (Gizlilik)High

Integrity (Bütünlük)None

Availability (Erişilebilirlik)Low

Kısmi yama

2 düzeltme kanıtı bulundu; en az 2 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

Follow the vendor

Red Hat

debian

Weakness Type (CWE & CAPEC)

CWE-416

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