CVE-2026-97687VulnerabilityPublished 21 Sep 2026Updated 13 Nov 2026

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

Affects Red Hat pdflySource GCVE Database

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Mentioned vulnerabilities

CVE-2026-97688

Not known to be exploited · fixed in Ubuntu package updates : patch the Ubuntu python-urllib3 package soon.

Data as of 14 Nov 2026, 20:44 UTC

Severity

High

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.5.1_26, 2.0.12_8, 2.6.3-1ubuntu1.2

Exploitation evidence

Disclosed: evidence found.
CVE published 21 Sep 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 14 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

Upgrade pdfly to 0.5.1_26; grokmirror to 2.0.12_8; the Ubuntu python-urllib3 package to 2.6.3-1ubuntu1.2.

Affected software

Product	Affected	Fixed in
Homebrewpdfly`pkg:brew/pdfly`Other threats	Affected >=0.5.1 <0.5.1_26	Fixed in 0.5.1_26
Homebrewgrokmirror`pkg:brew/grokmirror`Other threats	Affected >=2.0.7 <2.0.12_8	Fixed in 2.0.12_8
Homebrewwaybackpy`pkg:brew/waybackpy`Other threats	Affected >=3.0.6	Fixed in–
Ubuntu Pro 14.04 LTSpython-pip`pkg:deb/ubuntu/python-pip?arch=source&distro=esm-infra-legacy/trusty`Other threats	Affected 1.4.1-2 – 1.5.4-1ubuntu4+esm5 10 affected builds	Fixed in–
Ubuntu Pro 16.04 LTSpython-pip`pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps/xenial`Other threats	Affected 1.5.6-7ubuntu1 – 8.1.1-2ubuntu0.6+esm12 22 affected builds	Fixed in–
Ubuntu Pro 18.04 LTSpython-pip`pkg:deb/ubuntu/python-pip?arch=source&distro=esm-apps/bionic`Other threats	Affected 9.0.1-2 – 9.0.1-2.3~ubuntu1.18.04.8+esm8 20 affected builds	Fixed in–

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

AI-suggested

A patch is available and should be applied to update python-urllib3 packages to version 2.8.0-1.hum1 or later, which includes fixes for the described vulnerabilities. The fixed versions include 0.5.1_26, 2.0.12_8, and 2.6.3-1ubuntu1.2. Users should follow Red Hat's official update procedures as detailed in their advisory. No additional mitigations are specified or required beyond applying the update.

Description

A security update for Red Hat Hardened Images RPMs addresses multiple vulnerabilities in python-urllib3 packages. One notable flaw (CVE-2026-97688) allows a malicious server to cause a denial of service by triggering an infinite loop during chunked Deflate decompression, leading to excessive CPU usage and stalled network requests. The update includes several python3-urllib3 variants fixed in version 2.8.0-1.hum1. The vulnerabilities are rated high severity by Red Hat.

Impact

The primary impact is a denial of service condition caused by an infinite loop in the decompression logic of urllib3 when handling maliciously crafted compressed HTTP responses. This results in excessive CPU consumption and stalled network requests, potentially disrupting services relying on affected python-urllib3 versions. The severity is rated high by Red Hat. No confidentiality or integrity impacts are reported. No known exploitation in the wild has been observed.

CWE-295Improper Certificate Validation (opens in a new tab)
Base weaknessOWASP Top 10 A07:2025: Authentication Failures (opens in a new tab)
The product does not validate, or incorrectly validates, a certificate.
Architecture and Design · Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Implementation
If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
OWASP Cheat Sheets
Transport Layer Protection (opens in a new tab)
TLS Cipher String (opens in a new tab)
OWASP Authentication (opens in a new tab)
OWASP ASVS 4.0.3
V9.2.1 (opens in a new tab)
V1.9.2 (opens in a new tab)
V2.8.5 (opens in a new tab)
Attack patterns
Creating a Rogue Certification Authority Certificate (opens in a new tab)
Signature Spoofing by Improper Validation (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-835Loop with Unreachable Exit Condition (Infinite Loop) (opens in a new tab)
Base weakness
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
CWE-770Allocation of Resources Without Limits or Throttling (opens in a new tab)
Base weaknessLikelihood of exploit: HighCWE Top 25 (2025): #25
The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Requirements
Clearly specify the minimum and maximum expectations for capabilities, and dictate which behaviors are acceptable when resource allocation reaches limits.
Architecture and Design
Limit the amount of resources that are accessible to unprivileged users. Set per-user limits for resources. Allow the system administrator to define these limits. Be careful to avoid CWE-410.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended.
OWASP Cheat Sheets
Abuse Case (opens in a new tab)
OWASP ASVS 4.0.3
V8.1.4 (opens in a new tab)
V13.4.1 (opens in a new tab)
V11.1.4 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Exponential Data Expansion (opens in a new tab)
Serialized Data Parameter Blowup (opens in a new tab)
Serialized Data with Nested Payloads (opens in a new tab)
Oversized Serialized Data Payloads (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 3 Nov 2026, 09:01 UTC

WeaknessesCWE-295, CWE-835, CWE-770

Technical details

References

Community reviews

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