Is CVE-2026-46644 in the CISA KEV catalog?

No. CVE-2026-46644 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-46644?

CVE-2026-46644 has a CVSS v4 base score of 6.9 (MEDIUM).

What is the EPSS score for CVE-2026-46644?

CVE-2026-46644 has an EPSS score of 0.39% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-46644?

Upgrade php-symfony-polyfill on debian unstable to 1.38.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2026-46644

MEDIUM

6.9

CVSS v4

NVD

Description

Symfony Polyfill backports PHP features and provides compatibility layers for extensions and functions. From 1.17.1 until 1.38.1, symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload is empty or decodes to ASCII-only code points because Idn::process() does not enforce the UTS #46 revision 33 requirement that decoded ACE labels contain at least one non-ASCII code point. Originally unequal domain names can be regarded as equal, which can lead to blacklist bypassing, inconsistent URL parsing, and server-side request forgery in applications using the polyfill to canonicalise or compare hostnames. This issue is fixed in version 1.38.1.

CWE-1289

How to fix

Remediation Available

php-symfony-polyfillDebian

Fixed in:1.38.1-1CVE-2026-46644

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v4 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploit Intelligence

0.39%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Other references3

Related Vulnerabilities

Other CWE-1289 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-45179	High	7.2	2.6%	-	-
CVE-2026-47729	Medium	6.5	1.9%	-	Fix
CVE-2026-48710	Medium	6.5	1.4%	-	Fix
CVE-2025-62718	Critical	9.9	1.2%	-	Fix
CVE-2026-33515	Medium	5.3	1.0%	-	Fix
CVE-2022-0675	Medium	5.6	0.9%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.