Is CVE-2026-42934 in the CISA KEV catalog?

No. CVE-2026-42934 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42934?

CVE-2026-42934 has a CVSS v3 base score of 4.8 (Moderate).

What is the EPSS score for CVE-2026-42934?

CVE-2026-42934 has an EPSS score of 0.72% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42934?

Upgrade nginx on debian 11 to 1.18.0-6.1+deb11u6 or later. Fixes are available for 27 affected products.

CVE & CISA-KEV Catalog

CVE-2026-42934

MEDIUM

4.8

CVSS v3

NVD

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

nginxDebian

Fixed in:1.18.0-6.1+deb11u6CVE-2026-42934

Fixed in:1.22.1-9+deb12u7CVE-2026-42934

Fixed in:1.26.3-3+deb13u5CVE-2026-42934

Fixed in:1.30.0-4CVE-2026-42934

libnginx-mod-http-auth-pamUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-cache-purgeUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-dav-extUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-echoUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-fancyindexUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-geoipUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-headers-more-filterUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

libnginx-mod-http-image-filterUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-luaUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

libnginx-mod-http-ndkUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-perlUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-subs-filterUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-uploadprogressUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-upstream-fairUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-http-xslt-filterUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

libnginx-mod-mailUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

libnginx-mod-nchanUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

libnginx-mod-rtmpUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

libnginx-mod-streamUbuntu

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

nginxUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

Fixed in:1.10.3-0ubuntu0.16.04.5+esm7USN-8375-1

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

Fixed in:1.18.0-6ubuntu14.12USN-8354-1

Fixed in:1.24.0-2ubuntu7.9USN-8354-1

Fixed in:1.28.0-6ubuntu1.4USN-8354-1

nginx-commonUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

nginx-coreUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

Fixed in:1.10.3-0ubuntu0.16.04.5+esm7USN-8375-1

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

Fixed in:1.18.0-6ubuntu14.12USN-8354-1

Fixed in:1.24.0-2ubuntu7.9USN-8354-1

Fixed in:1.28.0-6ubuntu1.4USN-8354-1

nginx-extrasUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

Fixed in:1.10.3-0ubuntu0.16.04.5+esm7USN-8375-1

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

Fixed in:1.18.0-6ubuntu14.12USN-8354-1

Fixed in:1.24.0-2ubuntu7.9USN-8354-1

Fixed in:1.28.0-6ubuntu1.4USN-8354-1

nginx-fullUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

Fixed in:1.10.3-0ubuntu0.16.04.5+esm7USN-8375-1

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

Fixed in:1.18.0-6ubuntu14.12USN-8354-1

Fixed in:1.24.0-2ubuntu7.9USN-8354-1

Fixed in:1.28.0-6ubuntu1.4USN-8354-1

nginx-lightUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

Fixed in:1.10.3-0ubuntu0.16.04.5+esm7USN-8375-1

Fixed in:1.14.0-0ubuntu1.11+esm2USN-8375-1

Fixed in:1.18.0-0ubuntu1.7+esm1USN-8375-1

Fixed in:1.18.0-6ubuntu14.12USN-8354-1

Fixed in:1.24.0-2ubuntu7.9USN-8354-1

Fixed in:1.28.0-6ubuntu1.4USN-8354-1

nginx-naxsiUbuntu

Fixed in:1.4.6-1ubuntu3.9+esm6USN-8375-1

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.72%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Vendor Advisory1

my.f5.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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 2026-06-18.