Skip to content
Noroxi
NVD / CVE Program· CNA glibc

CVE-2026-86805: AT_SECURE programs may load attacker-controlled code via $ORIGIN

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.09% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 glibc 2.38-21 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 glibc 2.38-21 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program. Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.

MediumCVSS 6.3 · v3.1—No exploit Fix available
Published
Sep 22, 2026
Updated
Sep 23, 2026
EPSS
0.0% · 0th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.0%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · glibc
6.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-86805

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for the gnu c library records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

We use this product, ask for help

Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (glibc). Independent of NVD's CPE analysis and usually ahead of it.

  • The GNU C Library glibc

    • 2.14 and later · before 2.45affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9glibcbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-all-langpacksbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-develbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-docbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-gconv-extrabefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-headersbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-aabefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-afbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-agrbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-akbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-ambefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-anbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-anpbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-astbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-aycbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-azbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bembefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-berbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bgbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bhobefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bibefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bnbefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-bobefore 2.34-284.el9_8.42.34-284.el9_8.4
AlmaLinux:9glibc-langpack-brbefore 2.34-284.el9_8.42.34-284.el9_8.4

+96

Same product

the gnu c library: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-19499Buffer overflow in strfmon and strfmon_l right-justification padding
    30Monitor
  • CVE-2026-84243gettext: Directory traversal via the LANGUAGE environment variable
    28Monitor
  • CVE-2026-6791Potential stack-based buffer clash during tilde expansion in wordexp
    26Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-80489Sep 15, 2026 · EUC_JISX0213 decoding may hang on crafted input
    23Monitor
  • ← EarlierCVE-2026-8674Sep 17, 2026 · Assertion failure in the DNS stub resolver with a long search domain
    21Monitor
  • Later →CVE-2026-95818Sep 22, 2026 · AT_SECURE program buffer overflow via $ORIGIN processing
    14Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 glibc 2.38-21 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
almalinux:glibc2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-all-langpacks2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-devel2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-doc2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-gconv-extra2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-headers2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-aa2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-af2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-agr2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-ak2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-am2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
almalinux:glibc-langpack-an2.34-284.el9_8.4 · AlmaLinux:9Package registry (OSV)
debian:glibc2.43-7 · Debian:14Package registry (OSV)
opensuse:glibc2.40-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:glibc2.44-3.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:glibc-cross-aarch64-src2.40-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:glibc-cross-ppc64le-src2.40-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:glibc-cross-riscv64-src2.40-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:glibc-cross-s390x-src2.40-160000.7.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:compat-libpthread-nonshared0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-all-langpacks0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-benchtests0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-common0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-devel0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-doc0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-gconv-extra0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-langpack-aa0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glibc-langpack-af0:2.43-8.7.hum1 · Red Hat:hummingbird:1Package registry (OSV)

+4

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
Low

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records