CVE-2019-18408

archive_read_format_rar_read_data in archive_read_support_format_rar.c in libarchive before 3.4.0 has a use-after-free in a certain ARCHIVE_FAILED situation, related to Ppmd7_DecodeSymbol.

Published: 2019-10-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-18408 is rated Moderate Risk (60.7/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.04%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-18408

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 4.59% 4.04% -0.55%
2 2025-12-28 3.37% 4.59% +1.22%
3 2025-12-27 — 3.37% —

Full EPSS history (22 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-18408

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-18408

OS Trackers for CVE-2019-18408

vendor priority summary link
alpine high CVE-2019-18408: 1 source package rows (libarchive); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2019-18408
debian not yet assigned CVE-2019-18408 not yet assigned priority: Debian including 1 source packages (libarchive), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-18408
gentoo normal CVE-2019-18408: 1 GLSA(s) (202003-28), 1 atom(s) (app-arch/libarchive); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2019-18408
redhat high — https://access.redhat.com/security/cve/CVE-2019-18408
suse medium CVE-2019-18408 severity moderate: SUSE including 285 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 348 product×package rows across 57 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (57 product lines)): Known Affected 231, Fixed 109, Known Not Affected 8. https://www.suse.com/security/cve/CVE-2019-18408/
ubuntu medium CVE-2019-18408 medium priority: Ubuntu including 1 source packages (libarchive), 6 status rows across 6 suites (bionic, disco, eoan, trusty, upstream, xenial): released 4, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2019-18408

Affected software / configurations for CVE-2019-18408

Vendor Product Version Raw CPE
libarchive libarchive < 3.4.0 cpe:2.3:a:libarchive:libarchive:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.04 cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*

References for CVE-2019-18408

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00015.html
https://access.redhat.com/errata/RHSA-2020:0203
https://access.redhat.com/errata/RHSA-2020:0246
https://access.redhat.com/errata/RHSA-2020:0271
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14689 Third Party Advisory
https://github.com/libarchive/libarchive/commit/b8592ecba2f9e451e1f5cb7ab6dcee8b8e7b3f60 Patch Third Party Advisory
https://github.com/libarchive/libarchive/compare/v3.3.3...v3.4.0 Release Notes Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00034.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6LZ4VJGTCYEJSDLOEWUUFG6TM4SUPFSY/
https://seclists.org/bugtraq/2019/Nov/2
https://security.gentoo.org/glsa/202003-28
https://support.f5.com/csp/article/K52144175?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/4169-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4557
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