CVE-2026-42371VulnerabilityPublished 30 Apr 2026Updated 5 Oct 2026

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity

High

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Apr 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 29 Oct 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 noarch uriparser-main@noarch SUSE aarch64 liburiparser1-0.9.8-160000.5.1.aarch64 uriparser-0.9.8-160000.5.1.aarch64 uriparser-devel-0.9.8-160000.5.1.aarch64 mingw32-uriparser-0:1.0.1-1.hum1@noarch@public-hummingbird-aarch64-rpms	Fixed in–

AI-suggested

The Red Hat advisory includes updated RPM packages for uriparser, but does not explicitly confirm that these updates fix CVE-2026-42371. Until a fix is confirmed, users should limit exposure to processing excessively long URIs and monitor for updates from Red Hat. No vendor-provided mitigations or workarounds are specified in the advisory.

Description

This update for uriparser fixes the following issues - CVE-2026-42371: numeric truncation in text range comparison when an application accepts URIs with a length in gigabytes (bsc#1262999). - CVE-2026-44927: truncation of `ptrdiff_t` to `int` in various places (bsc#1264578). - CVE-2026-44928: function family `EqualsUri` can misclassify two unequal URIs as equal (bsc#1264579).

Impact

The vulnerability can cause a denial of service condition by crashing or destabilizing applications that process extremely long URIs using the uriparser library. This results in application unavailability. There is no indication of confidentiality or integrity impact. Exploitation requires local access and high complexity, limiting the attack surface.

Summary

CVE-2026-42371 is a numeric truncation vulnerability in the uriparser library affecting Red Hat Hardened Images RPMs. The issue arises during text range comparison of extremely long URIs (in the gigabyte range), leading to integer overflow or wraparound (CWE-190). A local attacker can exploit this by supplying a malformed, excessively long URI, causing the application to crash or become unavailable due to resource exhaustion or instability. The vulnerability impacts availability but does not affect confidentiality or integrity. The Red Hat advisory provides updated RPM packages including uriparser-1.0.1-1.hum1 versions, but does not explicitly confirm a fix for this CVE in the advisory content. The CVSS base score is not provided by Red Hat, but external sources rate it around 4.7 to 5.1 with high attack complexity and local attack vector.

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

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Aug 2026, 17:50 UTC

WeaknessesCWE-190

Technical details

References

Community reviews

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