How severe is CVE-2026-32777?

CVE-2026-32777 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-32777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-32777?

CVE-2026-32777 affects Libexpat Project Libexpat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-32777?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-32777 have an EU (EUVD) identifier?

Yes. CVE-2026-32777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12349.

When was CVE-2026-32777 published?

CVE-2026-32777 was published on 2026-03-16 and last updated on 2026-06-17.

CVE-2026-32777

CVE-2026-32777 is a medium-severity vulnerability in Libexpat Project Libexpat with a CVSS 3.x base score of 4.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

Severity: Medium (CVSS 3.x base score 4.0)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-12349
Weakness: CWE-835
Affected product: Libexpat Project Libexpat
Published: 2026-03-16
Last modified: 2026-06-17

Description

libexpat before 2.7.5 allows an infinite loop while parsing DTD content.

Frequently asked questions

What is CVE-2026-32777?: libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
How severe is CVE-2026-32777?: CVE-2026-32777 has a CVSS 3.x base score of 4.0, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-32777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-32777?: CVE-2026-32777 affects Libexpat Project Libexpat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-32777?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-32777 have an EU (EUVD) identifier?: Yes. CVE-2026-32777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-12349.
When was CVE-2026-32777 published?: CVE-2026-32777 was published on 2026-03-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*

More vulnerabilities in Libexpat Project Libexpat

CVE-2024-45492 — Critical (CVSS 9.8): An issue was discovered in libexpat before 2.6.3. nextScaffoldPart in xmlparse.c can have an integer overflow for…
CVE-2024-45491 — Critical (CVSS 9.8): An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts…
CVE-2022-25315 — Critical (CVSS 9.8): In Expat (aka libexpat) before 2.4.5, there is an integer overflow in storeRawNames.
CVE-2022-25236 — Critical (CVSS 9.8): xmlparse.c in Expat (aka libexpat) before 2.4.5 allows attackers to insert namespace-separator characters into…
CVE-2022-25235 — Critical (CVSS 9.8): xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a…
CVE-2022-23852 — Critical (CVSS 9.8): Expat (aka libexpat) before 2.4.4 has a signed integer overflow in XML_GetBuffer, for configurations with a nonzero…

All CVEs affecting Libexpat Project Libexpat →

Other CWE-835 (Loop with Unreachable Exit Condition (Infinite Loop)) vulnerabilities

CVE-2026-24816 — Critical (CVSS 10.0): Loop with Unreachable Exit Condition ('Infinite Loop') vulnerability in datavane tis…
CVE-2018-20784 — Critical (CVSS 9.8): In the Linux kernel before 4.20.2, kernel/sched/fair.c mishandles leaf cfs_rq's, which allows attackers to cause a…
CVE-2017-12997 — Critical (CVSS 9.8): The LLDP parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in…
CVE-2017-12995 — Critical (CVSS 9.8): The DNS parser in tcpdump before 4.9.2 could enter an infinite loop due to a bug in print-domain.c:ns_print().
CVE-2017-12990 — Critical (CVSS 9.8): The ISAKMP parser in tcpdump before 4.9.2 could enter an infinite loop due to bugs in print-isakmp.c, several functions.
CVE-2026-31448 — Critical (CVSS 9.4): In the Linux kernel, the following vulnerability has been resolved: ext4: avoid infinite loops caused by residual…

Browse all CWE-835 (Loop with Unreachable Exit Condition (Infinite Loop)) vulnerabilities →