LOW
CVE-2026-4539
CWE-400Published: March 22, 2026· Updated: Mar 23, 2026
3.3
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th
Official Description
A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Technical Analysis
CVE-2026-4539 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityLow
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
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NVD Detail
Official NIST entry
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CVE Program entry
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All References (5)
Quick Facts
CVE IDCVE-2026-4539
CVSS Score3.3 / 10
SeverityLOW
WeaknessCWE-400
CISA KEVNo
EPSS (30d)0.01%
PublishedMar 22, 2026
Related CVEs (CWE-400)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-4539 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.