CVE-2026-0861VulnerabilityPublished 27 Jan 2026Updated 14 Oct 2026

Red Hat Security Advisory: glibc security update

Affects Red Hat glibcSource GCVE Database

Mentioned vulnerabilities

CVE-2026-0915

Authoritative record:CVE-2026-0861· High 8.4

Not known to be exploited · CVSS 8.4 High.

Data as of 26 Oct 2026, 09:16 UTC

CVSS 3.1 base score

8.4High

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

EPSS: 0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC 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
The GNU C Libraryglibc	Affected >=2.30 <=2.42	Fixed in–
Debiandebian/glibc`pkg:deb/debian/glibc`Other threats	Affected =2.30	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated glibc packages for Red Hat Enterprise Linux 10 that address these vulnerabilities. Users should apply the official Red Hat updates as detailed in the advisory (RHSA-2026:1334) and the referenced article https://access.redhat.com/articles/11258. There is no indication that additional mitigation steps are required beyond applying these updates.

Description

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly. Security Fix(es): * glibc: Integer overflow in memalign leads to heap corruption (CVE-2026-0861) * glibc: glibc: Information disclosure via zero-valued network query (CVE-2026-0915) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Impact

The integer overflow vulnerability (CVE-2026-0861) could lead to heap corruption, potentially causing application crashes or unpredictable behavior. The information disclosure vulnerability (CVE-2026-0915) may allow unauthorized disclosure of information via crafted network queries. Both vulnerabilities affect critical system libraries, which could impact system stability and confidentiality if exploited. No known exploits are reported in the wild at this time.

Summary

This advisory covers two vulnerabilities in the GNU C Library (glibc) used by Red Hat Enterprise Linux 10. CVE-2026-0861 is an integer overflow in the memalign function that can cause heap corruption. CVE-2026-0915 involves information disclosure through zero-valued network queries. Both issues affect core system libraries essential for Linux operation. The advisory references updated glibc packages that fix these vulnerabilities. No CVSS scores are provided in the advisory, but the severity is rated moderate by Red Hat Product Security.

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).
CWE-908Use of Uninitialized Resource (opens in a new tab)
Base weaknessLikelihood of exploit: Medium
The product uses or accesses a resource that has not been initialized.
Implementation
Explicitly initialize the resource before use. If this is performed through an API function or standard procedure, follow all required steps.
Implementation
Pay close attention to complex conditionals that affect initialization, since some branches might not perform the initialization.
Implementation
Avoid race conditions (CWE-362) during initialization routines.
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, 18:39 UTC

WeaknessesCWE-190, CWE-908

Technical details

References

Community reviews

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