CVE-2025-64031VulnerabilityPublished 22 Jul 2026Updated 2 Nov 2026

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Affects Red HatSource GCVE Database

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Mentioned vulnerabilities

CVE-2026-16517

Not known to be exploited · fixed in Red Hat package updates : update Red Hat when convenient.

Data as of 5 Nov 2026, 00:01 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.8.8

Exploitation evidence

Disclosed: evidence found.
CVE published 22 Jul 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 Product Security Red Hat	Affected Red Hat Red Hat Hardened Images aarch64 bsdcat-0:3.8.8-3.1.hum1@aarch64	Fixed in–

AI-suggested

A security update is available that fixes this vulnerability in the libarchive packages for Red Hat Hardened Images RPMs (version 3.8.8-3.1.hum1). Users should apply this update to remediate the issue. No additional mitigations are required as the vulnerability is in the ZIP write path only and exploitation is unlikely under normal conditions.

Description

A signed integer overflow vulnerability exists in libarchive's ZIP writer when ZIP encryption is enabled and the entry file size is near the maximum 64-bit integer value. This overflow can cause undefined behavior such as incorrect Zip64 extension decisions or potential memory corruption. The vulnerability is rated low severity by Red Hat due to the highly contrived conditions required for exploitation and limited impact. A security update for Red Hat Hardened Images RPMs including libarchive packages addresses this issue.

Impact

The vulnerability can cause undefined behavior including potential crashes or memory corruption during ZIP archive creation with encryption enabled and very large file sizes. However, the conditions for exploitation are highly contrived, requiring file sizes near INT64_MAX and ZIP encryption enabled. Red Hat classifies the impact as low severity with no known exploits in the wild.

Summary

CVE-2026-16517 is a signed integer overflow vulnerability in the archive_write_zip_header function of libarchive's ZIP writer. When ZIP encryption is enabled and the file size approaches INT64_MAX, adding encryption overhead causes an int64_t overflow, leading to undefined behavior. This may result in incorrect Zip64 extension handling or memory corruption. Red Hat rates this issue as low severity because exploitation requires ZIP encryption enabled and extremely large file sizes, making real-world attacks unlikely. The vulnerability affects libarchive RPMs included in Red Hat Hardened Images and has been fixed in version 3.8.8-3.1.hum1.

CWE-120Buffer Copy without Checking Size of Input (Classic Buffer Overflow) (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #11
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Operation · Build and Compilation · Environment Hardening
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index…
OWASP Cheat Sheets
Docker Security (opens in a new tab)
XML Security (opens in a new tab)
OWASP ASVS 4.0.3
V5.4.1 (opens in a new tab)
V14.1.2 (opens in a new tab)
V13.3.1 (opens in a new tab)
Attack patterns
Buffer Overflow via Environment Variables (opens in a new tab)
Overflow Buffers (opens in a new tab)
Client-side Injection-induced Buffer Overflow (opens in a new tab)
Filter Failure through Buffer Overflow (opens in a new tab)
MIME Conversion (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-190Integer Overflow or Wraparound (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
Requirements
Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
Requirements · Language Selection
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V5.4.3 (opens in a new tab)
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
Attack patterns
Forced Integer Overflow (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 24 Sep 2026, 04:51 UTC

WeaknessesCWE-120, CWE-190

Technical details

References

Community reviews

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